2984 cavity ventilation brochure 2006 - cavity trays … ventilation brochure.pdf · be ventilated...

vent i l at ionPRODUCT GUIDEvolume 19/a

ventilationproducts

for roofs, walls and floors

Cl/SfB (21.9)(47) alternative listing

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Pitched roof - above 15°

Pitched roof - below 15°

Mono pitch roof - above 15°

Mono pitch roof - below 15°

10mm gap

10mm gap

25mmgap

10mmgap

25mmgap

5mm gap

5mm gap

25mmgap

Flat roof - cold deck

25mmgap

25mmgap

Flat roof - abutment

Ceiling following pitch of roof

25mmgap

25mmgap

25mmgap

25mmgap

Under floor and void ventilation

Cavity and compartmented /fire stopped sections

References: Approved Document F2.BS 5250. BRE Report 262.Approved Document C 2004 edition.BS 5534. NHBC Standards. Zurich Standards. Scottish TechnicalStandards.

Pitched cold roofs should crossventilate. The equivalent of a 10mmgap running continuously the fulllength of both eaves is usual. Onpitches above 35° where the spansexceed 10m consider also higher-level (equivalent 5mm) additionalventilation as defined in BS5250.

Single slope (monopitch) roofs maybe ventilated (equivalent 10mm) ateaves and (equivalent 5mm) atroof/wall intersection or thereabouts.Always ensure every ventilation routeis cross balanced - with entry andexit routes.

Where the insulation follows the roofslope observe the increased aperturerequirement at eaves and the needto maintain a free air space abovethe sloping ceiling. The ventilationlevel at the top of the roof is 5mm.

In cold roof situations where the roofpitch is below 15° cross ventilate using(equivalent 25mm) rated products. On spans exceeding 10m observeApproved Document F2 guideline byincreasing ventilation x 0.6% of roof(plan) area.

One-Way Aspirating Underlay may beused in cold and warm roofs to providethe requisite level of ventilation as analternative method of compliance.Ensure any need to cross-batten iscarried out if applicable. Productinstructions provide guidelines.

Suspended floors generally require aminimum of a 150mm void under andbalanced cross ventilation. Theequivalent of 1500mm2 airflow for eachmetre run of wall is usual or 500mm2

for every square metre of floor area –whichever is the greater. Pipes of notless than 100mm diameter may service airflow to voids formed bycompartment or sleeper walls. In suchcircumstances select the compatibleconnections to appropriate straight orcranked telescopic wall ventilatorsdetailed in this product guide.

Roof Space Ventilation

We welcome you to the range ofbuilding envelope ventilationproducts by Cavity Trays Ltd.

Ventilation to negate the effects ofcondensation in roofs, walls andfloors is necessary to comply withthe requirements of the BuildingRegulations and British Standards.Careful selection of products isalways recommended to optimiseventilation levels and performance.

Roof Wall or Floor is highlightedat the top of every product listing

indicating where the product maybe used.

At the bottom of every productentry are simple illustrationsproviding a general guide to thelevels of compliant ventilationunder the current BuildingRegulations. Examples of all suchillustrations are shown below.

Construction standards vary andso do product standards. Alwayscheck compliance and suitabilityprior to using a product.

Product type codes within each section are listed in alphabeticalorder. In some instances, products are then grouped by function.Example: Under W the Type W caviweep is then followed byother types of weep.

Ventilation ProductsCavibrick 01

Cavibrick Sleeves 01

Cavibrick Rectangular to Round Converter Sleeve 02

Sleeve and Duct Cavitrays 02

Type TAV 03

Extension Sleeves 03

Type TAV to Round Converter 04

Type CSV 04

Type CRSV 05

Type CV 05

Type ECF 06

Type EROV 300/400 06

Type ERV 07

Type FFFV 07

Type OEVWF 08

Type OEVWF-25 08

Type OFV-10 09

Type OFV-25 09

One-Way (heavy duty) 10

One-Way (maximum) 10

Type PV 11

Type RASV 11

Type RAV-FL 12

Type REV 12

Flush Slate Ventilator 13

Contract Slate Ventilator 13

Universal Roof Ventilator 14

Type SSV 14

Type SSV-RU 15

Type SSV-15 15

Type SV-FL 16

Type SV-GP 16

Type T 17

Three in One Roof Ventilation Kit 17

Type USV 18

Type VEP 18

Ventilation Packs 19

Ventilating Flashing 19

Type W 20

Type W Extension Duct 20

Type W Render Cover 21

Euroweep-vent 21

Ventilation Guidelines

*Alternative option

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Cavibrick Sleeves

useThe cavibrick is a highperformance ventilator which maybe used instead of a conventionalair-brick.

introductionManufactured to brick dimensions,the cavibrick promotes a high airthroughput, via a front louvredgrille. The louvres are proportionedto maximise performance whilstcontouring the air to challengethrough-draughts. The louvres arealso spaced to comply with thelatest BS requirements but havebeen staggered to offer also aninsect resistant screen which isnot offered on some standardairbricks.

The cavibrick incorporates awater dam back to prevent rainpenetration and crossflow

separators. Moulded in a range of colours, the cavibrick may beused singularly, or in multiples.The cavibrick is fully compatiblewith our range of telescopic andstraight sleeves.

data• BS polypropylene, in terracotta,

slate, beige, brown, white andblack.

• Approx. size 220mm x 60mmx 70mm.

• Free airflow up to 7,500mm2

per cavibrick.• May be used singularly or

clipped together to create 150 x 225 and 225 x 225mmsized airbrick assemblies.

• Packed in boxes containing50no.

• Smaller quantities available.• Attachments available – see

entries.

useSleeve attachments to provideventilation to specific areas.

introductionA range of straight sleeves toaccommodate one, two or threecavibricks. (High throughputcavibricks are designed to beused singularly or can be lockedtogether to form larger brick-sizedventilating units.)

When connected to a cavibrickthe combined length is sufficientto accommodate all popularcavity wall widths. The threestandard straight sleeves are:75mm x 225mm, 150mm x225mm and 225mm x 225mm.

We recommend sleeves areprotected with a cavitray wherethey pass through the cavity, tocomply with NHBC/best practice.(See Sleeve and Duct Cavitrays.)

data• Black polypropylene.• Length 300mm.• Special lengths to order.• 75mm x 225mm,

150 x 225mm,225mm x 225mm.

• Fold-flat design minimisesstorage space.


• Smaller quantities available.

Cavibrick high performance air-brick

• High air throughput

• Insect screening

• Self-draining base

• Clip together to make up composite sizes

• Range of colours

• Range of sizes

• Compatible with Cavibrick

• Fold flat storage

• Unobstructed airflow

2 brick sleeve 150mm x 225mm



Consider for use where shown. See inside cover for key. Consider for use where shown. See inside cover for key.

usePermits cavibrick to be connectedto standard pipe.

introductionWhere it is proposed to provideventilation to a remote room,under floor area or void, arectangular to round convertersleeve is available to permit theuse of standard 100mm nominalplastic soil pipe.

The cavibrick promotes excellentair throughput that can beconveyed using standard pipe if

so required. We recommendsleeves are protected with acavitray where they pass throughthe cavity, to comply withNHBC/best practice. (See Sleeve and Duct Cavitrays.)

data• Black polypropylene.• Size 70mm x 225mm +

circular connection.• Accepts standard single

cavibrick.• Packed in boxes containing

10no.• Also available individually.

Cavibrick Rectangularto Round ConverterSleeve

usePreformed trays to protect sleevesand ducts where they pass througha cavity wall.

introductionWhere a straight or crankedsleeve/duct passes through acavity, measures should be takento ensure penetrating watercannot use the upper surface ofthe sleeve/duct as a means toreach the inside skin. Use of apreformed cavitray prevents waterbridging and promotes complianceof the Building Regulations.

The requirement to provide suchprotection is highlighted in thelatest British Standard 5628-3:2001, which specifically refers toducts and pipes. Recommended foruse with Type TAV, straight, andrectangular to round converters.

data• Solid DPC preformed trays.• May be used in cavities from

50mm to 140mm.• Size 330mm x 160mm x

50mm.• Packed in boxes containing

50no.• Smaller quantities available.

Sleeve and DuctCavitrays

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roofs walls floors roofs walls floors

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1 brick to round converter

• Compatible with Cavibrick

• Fits standard pipe


• Suits range of cavity sizes

• Compatible with all sleeves

• Prevents tracking


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Extension SleevesVertical andHorizontal

useProvides cranked air-duct routefrom cavibrick to area at differentlevel.

introductionThe Telescopic AdjustableVentilator extends or contractslike a telescope. It extends to amaximum of five brick courses. It is designed to accommodatethe high performance cavibrick,or may alternatively be used with a conventional air-brick. Airflowcan be directed to a specific areaof the structure, at a differentlevel. Where a greater variationis required beyond five courses,an intermediate sleeve isavailable to extend the range.

The Type TAV offers anunobstructed airflow route to

promote best practice. Anaccompanying DPC cavitray isalso available to order, to providedamp proofing integrity asdefined within the BuildingRegulations.

data• 225mm x 70mm opening.• Extended height

370mm/225mm.• May be used in cavity walls

with 50mm cavity upwards.• BS polypropylene, colour black.• Maximum airflow when used

with approved cavibrick (7,500mm2)

• Direct flow path.• Packed in boxes containing

20no. • Smaller quantities available.

useTo extend Type TAV crankedsleeve to create a greater distancebetween inlet and outlet level.

introductionWhere airflow is required for aspecific area at lower level via acavity wall, a cranked sleeve isemployed with a cavibrick. The (cranked) Type TAVTelescopic Adjustable Ventilator is used for such purposes andprovides a five brick coursesmaximum difference betweeninlet and outlet levels.

Where a greater verticaldifference is necessary, an

extension sleeve is available.Vertical sleeves are available intwo standard lengths, with speciallengths available to order.

Sleeves can also be supplied toextend the Type TAV horizontally.Specify clearly if required socorrectly dimensioned section issupplied. See next entry if youwish to connect pipe to Type TAV.

data• Black polypropylene.• Lengths 300mm and 450mm.• Special lengths to order.• Packed in boxes containing


In instances where it is desirableto horizontally extend the lowerTAV aperture inwardly (toaccommodate an unusual innerskin dimension or feature), anappropriate horizontal 600mm

long extension sleeve is available.For distances exceeding 600mmhorizontally, we recommend useof a Type TAV to RoundConnector that permits use ofnominal 100mm plastic pipe.

Type TAV telescopic adjustable ventilator

• Unobstructed airflow route

• Extends and retracts to suit course level

• Accommodates high performance cavibrick

• Accompanying cavitray

• Horizontal and vertical extension sleeves• TAV compatible


• Available in special lengths

HorizontalExtension Sleeves


useTo permit attachment of circularpipe to bottom outlet of Type TAVtelescopic ventilator.

introductionWhere a plastic nominal 100mmpipe is used to carry airflow tospecific parts of a structure, ameans of connection to ourcranked telescopic ventilator isrequired.

The TAV to Round Connector isdesigned for such purposes. Thisattachment can be successfully

used to provide piped exit routesfor radon gas (below floor level)to the perimeter of a buildingwhere discharge is via crankedventilators because of the exteriorground levels.

data• Black polypropylene.• Size 50mm x 225mm +

circular connection. • Accepts TAV model only.• Packed in boxes containing

10no.• Also available individually.

Type TAV

useCircular Soffit Ventilators withlouvres, for new and existing work.Ventilators promote the entry of airinto the roof space.

introductionThe upgraded CSV Circular SoffitVentilator may be introduced intonew soffits or existing soffits. Itpermits easy and quick upgradingof existing structures.

The unique injection mouldedventilator has a deflecting louvred

face, promoting positive air entryand insect screening. Unlikestandard ventilators, the uniqueCSV may be rotated so that thelouvres slope downwards towardsthe masonry face. In so doing, novisible apertures/grilles areapparent to the eye and the resultis of a continuous unpenetratedsoffit, when a CSV of a matchingcolour is fitted.

This ventilator has a greater airthroughput than most models, andfewer are required per metre run tosatisfy requirements.

data• BS polypropylene.• Size 79/79mm x 15mm

(requires 70mm hole).• Colours: white, brown, black.• Free airflow 2100mm2.• Packed in boxes containing

50no.

Type CSV

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to Round Connector• Compatible with TAV

• Fits standard pipe


Circular Soffit Ventilator• Superior airflow 2,100m2

• New and existing work applications

• Rotate for visual or non-visual appearance


• Easy regulation compliance

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Type CV

useTo provide airflow in and out ofroof space via the soffit board. Suitable for introduction intoexisting soffit boards to fulfilairflow requirements.Also suitable for new buildapplications.

introductionThe CSRV differs from thestandard CSV as it has a deepbody that protrudes up into thesoffit box. The airflow aperturesare positioned around the sides of the deep body ventilator ratherthan through the top. Thisarrangement results in a fargreater airflow rating perventilator. Thus a lesser number

are required to fulfil the statutoryairflow levels.

The Type CSRV can be used onmost pitches of roof (appropriatelyspaced) and self-secures whenpushed into a 70mm circular hole.Always ensure airflow via a soffitventilator can reach the parts ofthe roof intended.

data• BS polypropylene• Size 70/90 x 40• Colours: white, brown and

black.• Free airflow 3,420mm2 per

ventilator.• Packaged in boxes containing

50no.

useTo provide air ventilation at eaveslevel, where a running masonrycorbel is constructed.

introductionThe Type CV Corbel Ventilator isdesigned to be incorporatedabove a running masonry corbelbuilt of brick, stone or similar.The ventilator has a slottedvertical front face, providing theequivalent of a 10mm continuousair opening. To the rear of theventilator, the base has a dovetailanchoring slot which permits thesecuring ties to be positivelyattached at any position to suitthe corbel masonry joints.

The Type CV provides an easyway of satisfying the statutoryroof ventilation requirementswhere a masonry corbel exists.

data• PVCU, black, white.• 2400mm lengths x 42mm

height x 28mm depth.• Use hardedge or eaves

protector to ensure felt clears front face.

• Suitable for new and existingwork.

• Integral insect screening.• Adjustable tie fixing.• Set-back anchoring position.• Lengths available individually.

Type CRSVCircular Recessed Soffit Ventilator

• High airflow

• Reduces number of soffit apertures



corbel ventilator• Suitable for roofs of 15 degrees upwards

• Free airflow 10,000mm2 per metre

• Integral insect screen

• Adjustable anchoring ties

• Compatible with our range of eaves ventilators

Airflow path when used with eaves ventilator

14mm

19mm

42m

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26mm

Dimension of Type CV

9mm


Type ECF

usePermits entry of air via eaves.

introductionThe eaves roll-out ventilator ismanufactured in PVCU. The crosscorrugations permit this product tobe supplied in long rolls which arethen uncoiled on site across thetrusses in the appropriate position.Nails are then used to secure theroll in position.

The result is an evenly spaced airroute along the eaves, providingventilation in accordance with theBuilding Regulation requirements.Type EROV is available in two sizes:

EROV300 is 300mm wide.EROV400 is 400mm wide.

data• Material PVCU, lightweight rigid.• Colour black.• Standard 6 metre rolls.• Free airflow 25,000 -

30,000mm2 per metre run.• Suits all popular truss centres.• Compatible with soffit and fascia

ventilators.• Packed in boxes containing

8no. rolls.• Smaller quantities available.• State whether you require

EROV 300 or EROV 400.

useTo provide ventilating infill whilstpreventing entry of birds undercontoured roof finishes.

introductionThe eaves comb filler ismanufactured from polypropylene

in one metre easy to handlelengths. The supple teeth of thecomb flex to accommodate thecontours of the tile or sheet. Such flexibility eliminates the needof purpose-made profiles to suiteach style of roof finish. Thus theECF suits a very wide range ofprofiles. When fixed to the top offascia, the ECF teeth slope forward,to splay and take up the gap whichwould otherwise be open.

data• Flexible grade polypropylene,

black.• 1000mm x 55mm.• Suits wide range of tile and

sheet profiles.• Pre-drilled for immediate fixing.• Packed in boxes containing

200no.

Type EROV 300Type EROV 400

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eaves comb filler• New and existing work applications

• Flexible teeth suit most tile styles

• Integral fixing holes


eaves roll-out ventilator•New and existing work applications

• Maximum free airflow 30,000mm2 per metre

• Suitable for all popular truss centres


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1000mm

The metre lengths are easy to handle and have integral fixing holes

The teeth of the Type ECF eavescomb filler flex and spread toinfill the underside profile of moststyles of roofing tiles.

The ventilator is unrolled evenly across the trusses to create a regularventilation pattern in the appropriate position, to provide up to 6 metres run.


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Type FFFV

useTo provide ventilation within flatand low pitched roofs.

introductionThe Type ERV External RoofVentilator is designed to permitthe roof void to breathe andprevent condensation occurring.Intended for use on lead covered,felted or similarly decked roofs,the Type ERV is manufacturedfrom lead to BS EN 12588:1999.

When positioned on a plinth orraised surface to suit theapplication and location, the TypeERV can provide a means ofexhausting moist air out of the

structure. Two sizes / airthroughput ratings are available.The use of a traditional leadbenefits a natural finish thatadopts a silver-grey appearanceas it ages.

data• British Standard lead to BS

EN 12588:1999.• 210mm x 140mm x 160mm

high + base surround.• ERV Small: rating 6,000mm2.• ERV Large: rating 12,000mm2.• 405mm x 140mm x 160mm

high + base surround.• Integral insect grille and drain-

out aperture.• Available individually.

usePromotes airflow in and out ofroof space via fascia top whilstproviding eaves comb facility andeaves protection.

introductionThe Type FFFV is a heavy-dutyfascia ventilator that sits on thefascia top. It has an extendedinboard that provides eavesprotection to which is attached aneaves comb filler designed toprevent bird entry under thecontours of rolled tiles. Use of theType FFFV permits the soffitboard to be uninterrupted withapertures or ventilation strips.Alternatively this product may beused where it is intended toposition the fascia against theexternal skin without a soffit.

The airflow rating via the integralinsect screen of the Type FFFV(10,000mm2) makes it suitablefor roofs above 15 degrees.

data• Length 900mm x 60mm

height x 55mm width.• 150mm inboard section and

70mm combs.• Colour black.• 10,000mm2 per metre rating.• Adjoining lengths interlock to

form continuous run.• New and refurbishment

applications.• Suitable for roofs of 15

degrees upwards.• Available individually.

Type ERV external roof ventilator

• High free airflow of 6,000mm2/12,000mm2

• Natural lead finish

• Integral baffles and drain-out slot


four-function fascia ventilator• Ventilates, supports, protects and infills tiles

• Suitable for pitches of 15 degrees upwards

• New and refurbishment applications

• Ensures consistent build detail

Section showing integral baffle and aperture that permits water to drain out

177mm

210mm335mm260mm140mm

160m

m

45m

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Dimension of Type ERV Small

70m

m

60m

m

58mm140mm

Dimensions of Type FFFV


usePermits entry of air into the roofspace via eaves.

introductionPreformed ventilator with flyscreen.For use between open eaves,without soffits. Provides ventilationroute into the roof space.

The OEVWF is designed for usewith open eaves details. (Cottage-style open-timber detail, withstand-off facia but no infillingsoffit board.) The open eavesventilator is suitable for use innew-build or re-roofing projects.When located in position, theflyscreen permits air entry whilstpromoting insect-resistant status.Manufactured of lightweight rigidPVCU, the open eaves ventilatorwith flyscreen provides an

economical way of constructing inaccordance with BuildingRegulations.

data• OEVWF/400 (use with

400mm truss centres).• PVCU black.• OEVWF/450 (use with

450mm truss centres).• OEVWF/600 (use with

600mm truss centres).• Versions promote a free airflow

equivalent exceeding14,000mm2, per metre run.

• Integral flyscreen.• Compatible with open eaves

details.• Primarily designed for roof

pitches above 15°• Packed in boxes containing


Type OEVWF

usePermits entry of air into the roofspace via the eaves.

introductionThe Type OEVWF-25 eavesventilator is suitable for use with roofpitches below 15 degrees. The 25designation identifies this product asproviding the equivalent of a 25mmcontinuous air gap. (Equates 25,000mm2 per metre run.) Insect screeningis via punched holes in the lowerleading edge. Suitable for lowerpitched roofs where no soffit is fitted.

data• Suitable for pitches below 15

degrees.• PVCU black.• Available for 600mm truss

centres only.• Compatible with open eaves

details• Integral insect screening• Packed in boxes containing


Type OEVWF-25

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open eaves ventilator with flyscreen• For open-eaves and non-fascia applications

• Integral fly screening

• All roof pitches accommodated


• 10,000mm2 and 25,000mm2 rating

open eaves ventilator with flyscreen• For open-eaves and non-fascia applications




• 10,000mm2 and 25,000mm2 rating

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Typical airflow path when TypeOEVWF is fitted.

435mm600mm

Dimensions of OEVWF/600


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Type OFV-25

useAlternative entry route for airflowservicing the roof space.

introductionOver Fascia Ventilators aresuitable for new andrefurbishment work. They eliminate the need for visiblesoffit ventilation and can beinstalled in non-soffit locations.

The Type OFV -10 is shaped topermit easy fixing to the top ofthe fascia board. It has an airflowrating of 12,500mm2 per metre,making it suitable for use withroof pitches of 15 degrees andabove. Integral insect screening.

data• Polypropylene.• Colours: black or white.• 12,500mm2 airflow rating.• Size: 1000mm x 40mm wide x

20mm high.• Suitable for roof pitches above

15°• Integral insect screening.• Integral fixing location holes.• Packaged in boxes containing

50no.• Smaller quantities available

useAlternative entry route for airflowservicing the roof space.

introductionThe Type OFV -25 is shaped topermit easy fixing to the top ofthe fascia board. It has anairflow rating of 25,000mm2 permetre, making it suitable for usewith roof pitches of 15 degreesand below.

Over Fascia Ventilators aresuitable for new andrefurbishment work. Theyeliminate the need for visiblesoffit ventilation and can beinstalled in non-soffit locations.Integral insect screening.

data• Polypropylene.• Colour: black only.• 25,000mm2 airflow rating.• Size: 500mm x 57mm wide x

48mm high.• Integral insect screening.• Integral fixing location holes• Primarily designed for roof

pitches above 15°• Packed in boxes containing


Type OFV-10 over fascia ventilator

• Hidden ventilation at top of fascia


• Integral insect screening

• Reduces fascia size and cost

• Provides statutory airflow

over fascia ventilator• Hidden ventilation at top of fascia



• Reduces fascia size and cost

• Provides statutory airflow

Over fascia ventilator OFV25, forroofs requiring the equivalent of a25mm continuous gap. Suitable forroof pitches below 15 degrees.

55mm

32m

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28mm

38m

m

20mm74mmOver fascia ventilator OFV10, for

roofs requiring the equivalent ofa 10mm continuous gap.Suitable for roof pitches of 15degrees upwards.

41mm

20mm 20mm

20m

m


useOne-Way (Heavy Duty) is anaspirating roofing underlay for non-ventilated pitched roof systems. One-Way may be used in non-ventilatedcold roof and most warm roofapplications when comprising onepart of a pitched roof system.

introductionOn pitched roofs this product may beused instead of conventional underlayfelt. It provides tough and durableprotection from the weather of thearea covered, having been tested interms of strength, stabilisation andresistance to water. (One-Way HeavyDuty supports 6 metres of water).Importantly One-Way permits theroof to breathe. Moisture vapourgenerated within a property cansafely ventilate through One-Way(Heavy Duty). The aspirating benefitis capable of venting over five timesthe moisture generated within atypical house. Thus this product canbe used to satisfy the protection,ventilation and vapour aspiratingqualities demanded by the BuildingRegulations and provides analternative to the use of conventionalventilation products and methods.

generalThis material has been tested to

meet/contribute to therequirements of BuildingRegulations (England and Wales)2000, C4 , Regulation 7. BuildingStandards (Scotland) Regulations1990 , Regulation 10, B2.1, B2.2,G3.1. Building Regulations(Northern Ireland) B2 and C4. One-Way aspirating underlay mayalso be used as a supported orunsupported underlay in tiled andslated roofs constructed inaccordance with BS 5534. Always consider the complete roofconstruction (from ceiling boards toroof tiles) with regard condensationrisk. Install only in accordance withour installation instructions thataccompany every order.

data• Size 50m x 1.5m or 75m x 1m • Weight 10.9 kg per roll.• Colour: dark blue• Construction 3 layer PP.• Thermally bonded. (not reliant

on glue for stability or weight).• Weight 130 gm2.• Strength (nail tear N) 135/155• Vapour resistance 0.19MNs/g

(breathability).• Water resistance hydrostatic

head >600cm H20.• Elongation MD/CD, % 60/60.• Tensile MD/CD, % 255/192.

One Way (heavy duty)

useOne-Way (Maximum) is an aspiratingroofing underlay for non-ventilatedpitched roof systems. The ‘Maximum’suffix qualifies this is the heaviestaspirating underlay available. The performance is very similar toOne-Way (Heavy Duty), but thethermally bonded structure isthickened. One-Way (Maximum)provides the strongest possibleprotection and the highest possibleresistance against tearing and ripping.

introductionOne-Way (Maximum) is suitablefor use in all warm and cold-pitched roof applications. Moisturevapour generated within a propertycan safely ventilate through One-Way (Maximum). The aspiratingbenefit is capable of venting overfive times the moisture generatedwithin a typical house. Thus thisproduct can be used to satisfy theprotection, ventilation and vapouraspirating qualities demanded bythe Building Regulations andprovides an alternative to the use ofconventional ventilation productsand methods.

generalThis material has been tested tomeet/contribute to the

requirements of BuildingRegulations (England and Wales)2000, C4 , Regulation 7. BuildingStandards (Scotland) Regulations1990 , Regulation 10, B2.1, B2.2,G3.1. Building Regulations(Northern Ireland) B2 and C4.One-Way aspirating underlay mayalso be used as a supported orunsupported underlay in tiled andslated roofs constructed inaccordance with BS 5534. Alwaysconsider the complete roofconstruction (from ceiling boards toroof tiles) with regard condensationrisk. Install only in accordance withour installation instructions thataccompany every order.

data• Size 50m x 1.5m or 75m x 1m • Weight 12.375 kg per roll.• Colour: grey• Construction 3 layer PP.• Thermally bonded. (not reliant on

glue for stability or weight).• Weight 165 gm2.• Strength (nail tear N) 200/220• Vapour resistance 0.21MNs/g

(breathability).• Water resistance hydrostatic

head >700cm H20.• Elongation MD/CD, % 50/60.• Tensile MD/CD, % 330/250.

One Way (maximum)

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aspirating roofing underlay for non-ventilated pitched roof systems

• Safely ventilates moisture vapour

• Protects against water ingress

• Robust stabilized barrier

• Part L benefit

aspirating roofing underlay for non-ventilated pitched roof systems

• Safely ventilates moisture vapour

• Protects against water ingress

• Robust stabilized barrier

• Part L benefit

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Type RASV

usePermits air entry into the roofspace via the eaves.

introductionIn pitched roof applications, theType PV panel ventilator fitsbetween the roof trusses andmaintains a defined airflow pathbetween the underside of roofingfelt and the roof insulation. Thefunction of the Type PV is toreceive air that enters and existsvia a fascia or soffit ventilator. Airis channelled through the body ofthe ventilator via apertures withinthe bottom and top upstandedges. The Type PV is available inthree sizes, all of which promotean airflow exceeding 10,000mm2

per metre run, when fittedcontinuously along the eaves.

data• PVCU, colour black.• Suitable for roof pitches of

15 degrees upwards.• PV/400 for 400mm truss

centres.• PV/450 for 450mm truss

centres.• PV/600 for 600mm truss

centres.• Sizes as above x 410mm

width.• Easy compliance of BRE

detail, Thermal Insulation:Avoiding Risks.

• Use with any compatiblefascia or soffit ventilator.



usePermits entry of air via soffit.

introductionThe Type RASV strip soffitventilator is designed for use witha standard horizontal or slopingsoffit boards on roof pitches of 15degrees or above. The airflowrating is 10,000mm2 per metrerun. The ventilation slots providescreening in accordance withregulations.

The Type RASV may be invertedand used at the top or bottom ofa sloping soffit.

data• PVCU compound.• Colours: white, brown or black.• Size: 2400mm x 60mm.• Airflow rating 10,000mm2 .• Insect screening.• Suitable for pitches above 15

degrees.• Packed in boxes containing


Type PV panel ventilator

• Suitable for roof pitches of 15 degrees upwards

• Compatible with fascia and soffit ventilators

• Easy-fit

• Excellent free airflow

reversible angled soffit ventilator • Reversible profile for sloping soffits


• Self coloured - corrosion proof


Panel Ventilator dimensions.

410mm 620mm

14.5 32mm 18mm4

Dimensions of Type RASV


useTo provide ventilation where flatroofs abut masonry.

introductionThe RAV-FL promotes air entrywhere a flat roof abuts a verticalmasonry wall. It is supplied withpre-drilled fixing holes and anintegral insect-resistant grille.Each unit is 1.2 metres in lengthand the heavy-duty profileincorporates an integral pivotholdhinge. This hinge permits easyand direct fixing, as the profilemay be secured to the verticalboard upstand when opened likea book.

The profile is then closed andfixing completed by securing thetop of the profile to the masonrywall. An air ventilation path whichcomplies with the currentregulations is established at theflat roof intersection. The productis compatible for use with ourhorizontal intersection cavitrayswhich may be established at ahigher level to permit the flashingto be dressed down to cover theexternal shell of the RAV-FLprofile.

data• RAV-FL = 1.2 metres x

200mm o/a x 50mm o/a x3mm thickness.

• Integral ventilation grillepromotes equivalent of a25mm continuous gap.

• Grade A1 compound PVCU,grey.

• Available individually.

Type RAV-FL

usePreformed eaves ventilator forintroduction between rafters inexisting roof spaces.

introductionThe refurbishment eaves ventilatorfits between rafters and can beplaced in position from within theattic space. The ventilator bottomportion rests under the insulation.

The ventilator top hinged portionhinges to follow the roof line. Itssimple shape allows air to travel toand from the roof void. Insulation isnot permitted to close the gapbetween the truss rafters. (Note: Inexisting properties air entry isnormally introduced through theexisting soffit. Please see CSVcircular soffit ventilators which may

be used with this refurbishmenteaves ventilator.)

data• PVC, clear or black.• REV600 for 600mm rafter

spacing.• REV400 for 400mm and

450mm rafter spacing.• Suits numerous truss spacings.• Excellent free airflow.• Compatible with other

ventilators.• Delete copy where shown.• Packed in boxes containing

50no.• Smaller quantities available.• Packed in boxes containing


Type REV

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room ventilation packs and gas appliance packs

• Permits roof to breathe at masonry intersection


• High airflow - 25,000mm2

per metre run

• Removable when re-roofing

refurbishment eaves ventilator• Translucent - checking of correct placement is easy

• Large protected air pocket

• High airflow 10,000mm2 per metre run

• Compliance of ventilation regulations

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RAV-FL in position showing theventilation path. Battens fixingvertically at one metre centresensure the timber upstand is set-offthe wall. At higher level a cavitray isincorporated and the lead flashingcovers the exterior of the RAV-FL.

50

185mm

315mm

Dimensions ofType REV

Type REV in position showing airflow path.


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Contract SlateVentilator

useTo provide ventilation route viaslated roof finish.

introductionThe Flush Slate Ventilator hasthe ventilation apertures mouldedwithin its finish and is suitable foruse at high or low positionswithin the roof surface. Whenfitted flush with the slates at 2metre centres, an airflowequivalent of a continuous 5mmgap services the roof space.

Alternatively, when fitted at1metre centres this productprovides the equivalent of the10mm continuous gap.The Flush Slate Ventilator mayalso be supplied with a

connection kit (ref FL/ILS) thatcan attach to a 110mm soil pipeor similar.

data• Sizes 600mm x 300mm and

500mm x 250mm.• Airflow rating of 5,000 or

10,000mm2 per metre runsubject to centres of fixing

• Slate black-grey colour finish.• Material: high-density

polypropylene.• Integral grille/screening.• Connection kit – ask for Flush

Slate Connector modelFS/ILS.

• Flush Slate Ventilators andConnection Kits are availableindividually.

useTo provide a ventilation route via aslated roof, but with an alternativeappearance.

introductionThe Contract Slate Ventilator canbe readily cut to suit both naturaland man-made slates. This singlemodel may be used with either600 x 300mm or 500 x 250mmslates. The airflow rating via theprotective cowl is 10,000mm2.

The Contract Slate Ventilator maybe used at high or low roof levelsat appropriate centres to fulfil therequisite airflow requirementsdemanded by the BuildingRegulations.

The Contract Slate Ventilator mayalso be employed to facilitate

natural non-mechanical extractionand ventilation. This is achievedusing the Contract Connector KitCS/HD that permits connectionwith a 110mm soil vent outlet.The airflow rating when this kit isattached is 8,000mm2.

data• Size 600mm x 300mm.• Airflow rating of 5,000 or

10,000mm2 per metre runsubject to centres of fixing.

• Slate black-grey colour finish.• Material: high-density

polypropylene.• Integral grille/screening.• Connection kit – ask for

Contract Slate Connectormodel CS/HD.

• Contract Slate Ventilators andConnection Kits are availableindividually.

Flush SlateVentilator

• Low profile - high throughput


• Cut to match slate size


• Low profile - high throughput


• Cut to match slate size



useSloping roof ventilator for use athigh or low level.

introductionThe universal tile ventilator isdesigned for use with tiled roofs.Compatible with many styles ofinterlocking profiled tiles and plaintiles, the universal ventilator maynormally be used on roof pitchesfrom 20 degrees up to 70degrees.

This ventilator promotes an airthroughput rating of 15,000mm2,through an insect resistantintegral screen. An optionaladaptor permits the ventilator tobe connected to a standard110mm pipe if required. Positionat appropriate centres at high orlow level to provide requisiteBuilding Regulation airflow rating.

data• Base 405mm x 440mm,

cap 293mm x 210mm• Airflow rating 15,000mm2.• PVCU/foam/aluminium.• Cap available in brown,

terracotta or grey.• Suitable for new and

refurbishment work.• Integral grille/screening.• Suits wide range of tiles.• Not recommended for Redland

Delta, Cambrian, Saxon,Richmond, Anchor Centurion,Marley Monach, Clay pantiles,Slate. Always determinesuitability. Double lap plain tilesrequire slight modification.

• Adaptor Kit for pipeconnection – requestUniversal/K1

• Ventilator and Adaptor Kits areavailable individually.

Roof Ventilator


introductionThe Type SSV strip soffit ventilatoris designed for use with a standardsoffit board. It permits airflow viathe soffit area whilst also providingsupport for soffit boards from 4mmto 14mm thickness. The airflowrating is 10,800mm2 per metre run,making it suitable for use where theroof pitch is 15 degrees or above.

The ventilation slots providescreening in accordance withregulations. (See Type SSV-15 for higher airflow rating.)

data• PVCU compound.• Colours: white, brown or black.• Size: 2400mm x 50mm x

20mm upstand.• Airflow rating 10,800mm2

• Insect screening.• Packed in boxes containing


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universal high performance roofventilator for tiled roofs

• High airflow

• Integral baffle and grille

• Suitable for new and refurbished work

• High or low level applications

strip soffit ventilator• Regulation airflow compliance


• Accepts different soffit thicknesses


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50mm

20m

mDimensions of the standard TypeSSV, which is for use on roofs of15 degrees upwards.


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Type SSV-15


introductionThe Type SSV-RU strip soffitventilator is designed for use witha standard soffit board. The RUdesignation refers to a reducedupstand of 5mm. This permitsthe Type SSV-RU to be fitted intothe back location groove of afascia.

All other details and dimensionsare as per the standard TypeSSV. The airflow rating is10,800mm2 per metre run,making it suitable for use wherethe roof pitch is 15 degrees orabove. The ventilation slotsprovide screening in accordancewith regulations.

data• PVCU compound.• Colours: white or brown.• Size: 2400mm x 50mm x

5mm upstand.• Airflow rating 10,800mm2.• Insect screening.• Packed in boxes containing



introductionThe Type SSV-15 strip soffitventilator is designed for use witha standard soffit board on roofpitches below 15 degrees. Theairflow rating is 25,000mm2 permetre run, making it suitable foruse where the roof pitch is 15degrees or below. The ventilationslots provide screening inaccordance with regulations.

data• PVCU compound.• Colours: white, brown or black.• Size: 2400mm x 80mm x

20mm upstand.• Airflow rating 25,000mm2.• Insect screening.• Suitable for pitches below 15



Type SSV-RUstrip soffit ventilator with reduced upstand

• Regulation airflow compliance


• Accepts different soffit thicknesses


SSV15 (for pitches below 15°) • Regulation airflow compliance for pitches below

15 degrees


• Accommodates different soffit thicknesses


50mm

5

The SSVRU has a reduced upstand of 5mm. It may be fitted into the groove of a fascia.

SSV15

80mm

20m

m

Dimensions of the Type SSV15,which is for use on roofs below 15degrees pitch and other pitches ifthe roof space is classified asaccommodation. See technicalobservations.



introductionThe Type SV-GP is a generalpurpose soffit ventilator strip, withan airflow rating of 25,000mm2

per metre run. In slopingapplications it may be used wherethe roof pitch is below 15 degrees.

The Type SV-GP may also beused to ventilate flat roofs,necessitating the fascia to befitted so it stands off the masonryface a distance of just 70mm.

The ventilation slots providescreening in accordance withregulations.

data• PVCU compound.• Colours: white or brown.• Size: 2400mm x 70mm x

20mm.• Airflow rating 25,000mm2.• Insect screening.• Suitable for pitches below 15



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soffit ventilator - general purpose• For sloping and flat roof ventilation

• 25,000mm2 airflow rating



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introductionThe Type SV-FL is a strip soffitventilator designed for use withflat and sloping soffit and hasan airflow rating of 25,000mm2

per metre run. Thus it may beused where the roof pitch isbelow 15 degrees.

The ventilation slots providescreening in accordance withregulations.

data• PVCU compound.• Colours: white or brown.• Size: 2400mm x 80mm.• Airflow rating 25,000mm2.• Insect screening.• Suitable for pitches below 15



Type SV-FLflat strip soffit ventilator

• Flat and sloping roof applications

• 25,000mm2 airflow rating

• Self coloured – corrosion proof


70mm

20m

m


Profile and dimensions of SV-FL

65mm 9

3.5

6

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usePreformed eaves ventilator permitsairflow requirements into roof space.

introductionThe Type T ventilator is categorisedas universal, as it may be used upona variety of roof pitches, and avariety of truss centres. The Type Tdoes not fit between truss rafters.Instead it clamps the individual trussrafter and creates a free air void oneach side, which more than satisfiesthe statutory airflow requirements.

Approximately 180mm x 400mm x70mm. The free air space exceeds15,000mm2 per metre run, whenused at 600mm centres along thewhole length of the roof. Theairflow is increased when placed atcentres of less than 600mm.

data• Polypropylene, black.• Superior free flow of air.• Suitable for use on a variety of

roof pitches and a variety oftruss spacings.

• Fully compatible andrecommended for use with our fascia and soffitventilators.

• Universal format reduces stockcommitment.

• Packed in boxes containing 50no. • Smaller quantities available.

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eaves ventilator• Suits all truss centres

• Suitable for all roof pitches

• Rapid fixing

• Compatible with our fascia and soffit ventilator VE

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70 70

120 85

Type T dimensions

Three-in-one

usePack providing over fasciaventilation, eaves ventilation andfelt support.

introductionThe three-in-one roof ventilationkit provides an easy andeconomical way of satisfyingregulation requirements regardingroof ventilation. Each kit containssufficient products to cover a sixmetre run. The contents of eachkit are as follows: 1no. 6 metreroll of eaves roll out ventilator(EROV). 10no. felt support trays,contract range (FST/C).

A six metre run of standard overfascia ventilator (OFV). Three-in-one roof ventilation kits may beused with tile and slate roofs. All pack products are alsoavailable separately.

data• Free airflow of 12,500mm2 per

metre run makes this packagesuitable for standard pitchedroofs above 15 degrees.

• Easy ordering and stockcontrol.

• Packaged solution forregulation compliance.

• Packaged 6 metre kits soldindividually.

roof ventilation kit• Packaged solution for regulation compliance

• Suitable for roof pitches of 15 degrees upwards

• Easy ordering and stock control


Section showing airflow route.


A Long Channel version of the TypeT is available in 1200mm lengths foruse where insulation restraint isrequired over a greater area. Typicalapplications include mansard roofand roof space conversions with theceiling line following the roof line.Packed in boxes containing 10no.Material and airflow as per Type T.

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Type VEP

usePreformed strip ventilator for useat soffit level on new and existingstructures.

introductionThe Type USV incorporates adirect fixing method fromunderneath, which is hidden byan attachable feature moulding.This permits the ventilation stripto be secured either to a battenattached to the lower inner faceof the existing fascia, oralternatively the strip may besecured directly to the fasciabottom edge.

When the moulded attachmentis clipped in position, all screwfixings are hidden from view.

data• UV stabilised PVCU.• Available in white or caramel.• 2400mm lengths, Pre-drilled• Airflow rating 12,500mm2 per

metre run.• Ideal for new and existing work.• Jaw accepts numerous

thicknesses of soffit.• Packed in boxes containing

20no. Smaller quantitiesavailable.

useProvides support of roofing feltand introduces integral eavesventilation.

introductionThe Type VEP is a robust feltsupport eaves protectorincorporating a hinged front thatadjusts to suit any angle ofroof/tilting fillet.

It is designed to prevent saggingfelt and water pooling behind thefascia. The body of the Type VEPalso incorporates an integraleaves ventilator. Thus this productis dual-function promotingpassive ventilation to and fromthe roof space whilst optimisingthe service life of the roofing felt.

The extent and depth of anyinsulation laid in the roof spacecan be optimised, thus promotingmaximum thermal compliance..

data• 1200mm x 600mm x 29mm

(covers two truss spaces at600mm centres.)

• Suitable for all popular roofpitches from 5 degrees up to80 degrees.

• BS polypropylene, colour black.• 25,000mm2 airflow rating.• Universal - does not limit

choice of compatible soffit orfascia inlet ventilator.

• Promotes best practice (BRE publication GRG30).

• Packed in boxes containing5no. (equates 6 metre run).

Type USV

Type USV dimensions

15

31mm

14

61mm20

universal soffit ventilator• Easy upgrade of existing structures


• Hidden fixing with cover moulding


ventilated eaves protector (universal)• Provides felt support

• Prevents water pooling

• Adjusts to all roof pitches

• Integral eaves ventilation

• Airflow ratings to suit all angles of roof

Type USV fitted to an existing flatsoffit detail. A counter battenreceives the screw fixing and thecover/feature moulding. In thisinstance the Type USV is fixed tothe bottom of the fascia.

The Type VEPcan be usedwith all styles ofsoffit and fasciaventilations

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useProvide ventilation to habitablerooms. Also air ventilation forareas in which boilers areenclosed.

introductionA total of three packs, each ofwhich consists of a cavibrick(s), a sleeve, an interior grille and aprotective DPC cavitray. Ideal for new construction andrefurbishment work.Pack 1: Single brick size.6,700mm2 airflow rating.Pack 2: Two brick size.13,700mm2 airflow rating.Pack 3: Three brick size.20,700mm2 airflow rating.

data• Material PVCU and

polypropylene.• Exterior bricks in terracotta

unless alternative colourordered.

• Sleeves: black.• Internal grilles: white.• Packs available individually.

Ventilation Packs

useTo provide flashing and ventilationat roof and wall intersections.

introductionWhere a monopitch roof abuts amasonry wall there is arequirement to provide ventilationof the equivalent of a 5mmcontinuous gap. The Type VFVentilating Flashing ismanufactured from BritishStandard lead to which is bonded abreathing base layer that permitsair to enter and exit.

When correctly incorporated at theroof / wall intersection, and flashingcan provide the airflow requirement.Thus the Type VF VentilatingFlashing looks like and may besubstituted in preference toordinary flashing. It offers theadvantage of permitting a roof tobreathe – naturally. Always makeprovision for air travelling via theflashing to reach the intended partsof the roof.

data• Code 4 British Standard lead to

BS EN 12588:1999.• Semi compressible Derexculate

breathing base layer.• Packaged solution for regulation

compliance.• Boxed 3 No. 1200mm x

300mm pre-creased lengths per box.

• Pitch applications 22.5°to 80°.

• May be conventionally restrainedif required.

• Available in boxed quantities.

Type VFroom ventilation packs and gas appliance packs

• Three airflow levels

• Complete ventilation packages

• Accompanying protective cavitray

• Easy stock control and selection

ventilating flashing• Use in place of ordinary lead

• Easy to dress

• Ventilates and flashes in one operations

• Pre-creased for speedy application

• Suits popular roof pitches*

215mm

215mm

215mm

225mm

150mm

75mm

Dimensions of the TypeVF ventilating flashing.The approximatethickness including thebonded breathing filterbase is 9.5mm.

150mm

150m

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9.5mm


Dotted line shows tray position

useDual-function product acts as acavity ventilator permitting thecavity to breathe. Also acts as aweep to evacuate water fromlintels, dpc’s and cavity trays.

introductionThe Type W may be used toprovide the balanced airconditions demanded within thecavity in timber-frameconstruction. The equivalentairflow of an open perp isrequired every 1.5 metres aroundthe base of the cavity walls andaround the top of the same walls.Where such wall cavities areclosed or compartmented withthe presence of horizontal firestops or similar, ventilationapertures are required below andabove such stops.

Type W cavivents are designedfor such purposes. Type W

cavivents are available in a rangeof colours to blend with theadjacent mortar or masonry.

To the front of each Type W is aninsect resistant grille, whilst withinthe body of the ventilator arebaffles to diffuse the effects ofdirectly-blowing winds. Type Wcavivents may be used to satisfythe requirements of cavityventilation.

data• Size 105/115mm x 65mm x

10mm.• Free airflow 320mm.• Use every third or forth brick to

provide compliant balancedventilation.

• BS polypropylene.• Colours: grey, black, beige,

brown, terracotta, white andtranslucent.

• Packaged in boxes containing50no.

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perp cavivent and caviweep• Dual-function combined weep and ventilator

• Insect resistant grille

• Integral water-check baffles

• Superior air throughout and water discharge capability

• Optional render protection cover, keeps grille clean during installation

• Compatible with Type W

• Interconnecting facility

• Suits numerous skin thicknesses

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useTo extend Type W to accommodatemasonry of greater thickness.

introductionThe Type W extension duct isdesigned to push-fit onto the TypeW Caviweep/Cavivent. It convertsthe standard Type W into a305mm straight through model. Itmay also be used to extend the

Type W when employed within asolid retaining wall to providemoisture release.

data• Material polypropylene.• Colour grey.• Size: 200/225 x 65 x 10mm.• 320mm2 air rating.• Packaged in boxes containing

50no.

Type W Extension Duct

200mm

115mm

105mm


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useProtective front cover to protectgrille of Type W during single ortwo-coat rendering.

introductionThe Type W caviweep/cavivent issometimes employed within areasof construction that are to berendered. The grille on the Type Wis purposely set forward, to deflectwind-driven rain blowing into theweep and also to prevent insectfostering within the weep body orbeyond. (NHBC Standards Extra21,2001 referred to the advantageof grilles in preventing insect entryand entry of wind-driven rain.)

The Type W optional cover protectsthe grille of the weep duringrendering. Each cover is brightlyflorescent coloured, for easyidentification and removal followingrendering. Please see other weepswithin our range, including weepwith integral cover, Euroweep, andweep with drop outlet.

data• Polypropylene.• Florescent coloured.• Boxed in 50s.• Ensures the dual-function

Type W caviweep/caviventpromotes optimum performance.

• Packaged in boxes containing50no.

Type W Render Cover

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for use during rendering• Ensures clean and unobstructed grille

• Florescent identification

• Easy release

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useThe purpose and function of theperp weep/ ventilator is describedon the previous pages (Type W). An alternative product is nowavailable offering smaller overalldimensions but with highperformance categorisation.

introductionEuroweep-vents are positionedwithin the perp joints betweenmasonry. Their function is twofold.They act as a weep to dischargewater from DPCs, cavity trays andlintels.

They also act as ventilators toencourage the cavity to breathe.Euroweep-vents were developedand are now extensively used onthe continent. They can also satisfyUK, N.H.B.C. and BuildingRegulation requirements. Compactsize does not compromise the

performance of the Euroweep-ventwhich promotes excellent freeairflow and discharge behaviour.

data• Size 49mm x 87mm x 9mm.• Free airflow approximately

300mm2 per unit.• BS polypropylene available in

grey, black, beige, terracotta andbrown.

• Integral baffles.• Vertical front.• Boxed in 50s.

Euroweep-Ventalternative perp/weep ventilator

• Dual-function weep and ventilator

• Integral baffle

• Vertical front

• Reduced size without bottleneck exit route

The upgraded Euroweep-ventfeatures a vertical front.

9mm


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Associated ProductsType CRSS 23

Type ECSC 23

hardedge Strip 1200 24

hardedge Strip 1500 24

Type I 25

Joist Gloves 25

Type LAD 26

Downward Opening 26

Type RBS 27

Type VG 27

Silicon Bond 28

Cavilink 28

Within this associated products section areaccessories and components for use in roofconstruction and roof access, plus masonryaids and attachments.

When seeking products for any buildingscheme, we recommend the standards towhich you wish to construct are comparedand matched with the appropriate solutionswe offer.

As part of our continuous productdevelopment we reserve the right to amendor change specifications without notice.

Should you have a query or seek a bespoke,non-standard or unusual requirement, pleasecontact our Helpdesk.

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Type ECSC

useContinuous soaker for use withslate roof where it abuts amasonry wall.

introductionThe Continuous Running SoakerStrip is pre-shaped for immediateuse. It resembles lead in colourand may be employed withconventional lead at the saddleand the foot. The upstand isunlipped, which eliminates thenecessity to chase into themasonry wall.

If fixing is a consideration, the

Type CRSS can be directlymechanically secured through itsupstand towards the top of thesection.

data• Glass reinforced polyester.• Colour lead grey.• 105mm high x 190mm wide x

3000mm.• Suitable for pitches from 22.5

degrees up to 60 degrees.• Pre-shaped for immediate use.• Hidden from view when

installed.• Lightweight and easy to

handle.• Permits use of conventional

saddle and foot.• Available individually.

useAs substitute for first (bottomlayer) slate course providingsupport and reducing slatecutting.

introductionThe Eaves Continuous SlateCourse replaces the eaves firstslate course and establishesrigidity and consistent support offwhich the slate laying and fixingmay commence.

Thus the amount of slate andslate cutting is reduced.

Installation is speedy and savingscan be achieved in both time andoverall purchasing costs.

data• Glass reinforced polyester, 1.83

kg/m2.• Colour black.• 360mm wide x 3000mm long.• Supplied in packs of 10.• Reduces costs and site work.• Hidden from view when

installed.• Robust and easy to handle.• Suitable for all standard

pitches of slate roof.

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continuous running soaker strip• Pre-shaped for immediate use

• Hidden from view when insulated

• Suitable for pitches from 22.5 degrees up to 60 degrees

• Lightweight and easy to handle

eaves continuous slate course• Reduces costs and site work

• Hidden from view when installed

• Robust and easy to handle

• Suitable for all standard pitches of slate roof

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Profile anddimensions of theType CRSS.

105

140 50

Dimensions of Type ECSC eavescontinuous slatecourse

360mm

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Hardedge Strip 1500

useProvides robust support andreinforcing of roofing felt at eaves.

introductionUnderlay felt should dischargewater into the eaves gutter. Thisrequirement is often flawed, andpooling of water is experiencedwithin the sagging felt area,situated behind the fascia board. The Hardedge anti-pooling stripaddresses this aspect.

The Hardedge anti-pooling strip isa rigid preformed polypropyleneprofile, which is positioned ateaves level prior to the laying ofthe roofing underlay felt. Itprovides support of the underlayfelt which is positioned and laid inthe conventional manner. The underlay felt is preventedfrom sagging betweenrafters/tilting fillets, thusaddressing the pooling problem.

data• Rigid polypropylene, black.• 1200mm x 250mm.• Suitable for use on roof

pitches from15 degrees up to45 degrees.

• Provides even support toaddress anti-pooling.

• Projecting lip promotes correctfelt positioning and dischargeof water.

• Available in packs containing10no.


useAlternative felt support and anti-pooling hardedge for eavesprotection.

introductionThe Hardedge 1500 or SpecialEaves Support as it is also known,is an extended and profiledversion of the 1200 model. It isboth longer and wider and offerseven greater support and rigidity.

The front of this Special EavesProtector extends forward tocarry the projecting roofing feltforward of the fascia. Thussupport is provided to a greaterextent and the felt is encouragedto gravitate and terminate into theadjacent guttering. Manufacturedfrom rigid polypropylene, theHardedge 1500 / Special EavesProtector is easily and speedilyfixed in position prior to theroofing felt.

data• Size 1500mm x 300mm

(225 + 75mm)• Black PVCU.• Suitable for use on roof

pitches from 15 degrees up to 45 degrees.

• Stops water pooling.• Supports felt and carries edge

forward to gutter.• Available in packs containing


Hardedge Strip 1200anti-pooling eaves and felt protectorstrip also special eaves protector*


• Provides even felt support


• Promotes correct discharge into gutter

anti-pooling eaves and felt protectorstrip also special eaves protector*


• Provides even felt support


• Promotes correct discharge into gutter

Hardedge 1200 profileand dimensions.

1200mm

250mm

Hardedge 1500 profile and dimensions.

This is also known as thespecial eaves protector.

1500mm

300mm

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Joist Gloves

usePreformed services duct forincorporation within floor screeds.Provides designed accessibleroutes for service pipes or wiring.

introductionDucts are incorporated on leveloversite or sub floors, and thefinal screed finished flush withthe duct top edges. Type I ductsaccommodate service pipes orservice wiring, and support canbe provided for pipes usinginternal clips.

Surface floor covers are availablein 12mm plywood, or compositionboard. Special woven seal glasscloth intumescent barrier bagsare available when ducts run fromone building compartment toanother.

data• 140mm x 50mm overall,

providing approx.accommodation area of104mm x 38mm.

• Standard length 2400mm.• Extruded PVCU. • Colour white.• Keying and stabilising flanges.• Available individually.

useTo guard against air leakagewhen traditionally building intimber joists. To protect the endsof rectangular timber joistsagainst dampness.

introductionThe joist glove snugly fits the endof the rectangular joist. It protectsagainst the hygroscopic behaviourof the timber. The exterior of theglove has a compressible seal.Should shrinkage occur, the sealguards against air leakage.

This compressible seal does notrely on pressing against the skinface where the surface finish canbe variable. It is actuallycompressed and enveloped withinthe block work masonry.

Joist Gloves are lightweight andfold-moulded from polypropylene.The mason applies a Joist Gloveto the end of each timber joistand can proceed as normal.There are no flanges to obstructplacement or pointing-in.

data• Available to suit all rectangular

timber joists dimensions.• Simply state joist height and

joist width.• Manufactured to a depth of

100mm, 150mm or 225mm.• New and refurbishment work

applications.• Appropriate for solid and cavity

construction.• Black polypropylene.• Available in any quantity to

specific order.

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in-screed services duct• Preformed ready-to-use duct

• Integral keying and stability flanges

• Intumescent fire barrier break

• Provides easy access for future maintenance

• Address Air Leakage and Thermal Bridging

• Joist-end DPC protection

• For joist envelopment in cavity wall and solid wall construction

• Refurbishment and new construction

• Over 50 rectangular sizes available

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Dimensions of the Type I in-screedservices duct.

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100

5038

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Joist Gloves are available in sizes tosuit all rectangular joist dimensions.The perimeter seal is enveloped withinthe masonry skin and guards againstair leakage when shrinkage occurs.

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Downward HingingLoft Access Doorand Frame

useTo gain access into roof space.

introductionPrefabricated and self-finishedinsulated loft access door andframe. Can be fixed immediatelybetween trimmed standardjoists. The LAD loft access doorand frame is supplied as acomplete unit. It satisfies thecontractor’s total requirements interms of aesthetics, finish, costand stock control.

The white laminated door is fullyremovable, and is supportedwithin a robust white PVCsurround which may be directlyfixed to standard trimmed joists.Within the surround are soft(draught) resi-seals which ensurethe access door is correctly andcompletely accommodated.

As the lid is fully removable bylifting upwards, attic insulationcan be cut and laid on top ifrequired.

Zero ODP rigid urethaneinsulation offers thermallyefficient performance as the coreinfill between composite foilfacings applied to both sides ofthe urethane.

White-faced board is additionallylaminated as the outer finish tothe upper and lower faces of theremovable door. Insulationthermal conductivity analysisgiven as 0.022-0.028 W/m.K.Incorporated within appropriateconstruction the insulationaggregate may be used toaddress part L requirements.

data• Size 1 550mm x 750mm.

(Trim to 555 x 775mm).• Size 2 550mm x 550mm.

(Trim to 555 x 555mm).• White compound. • A PVCU white laminated door

with solid core of Insulation.• Self-finished and ready to use.• Insulated.• Fully removable door on resi-

seals.• Available individually.

useAccess into attic spaces.

introductionHinged downward opening loftaccess door for use where a doorthat can be fitted completely clearis not required. Available in onesize only, the downward openingmodel requires a trimmedopening of approximately 566mmx 721mm. Made of lightweightPVCU and finished in white, theinsulated door has an integralturn latch.

An optional ODP rigid urethanesecondary layer can be supplied to

provide additional insulation to thismodel to increase thermalinsulation performance andaddress part L target. 0.022-0.028W/m.K sampled typical analysis.Must be clearly specified asoptional addition when ordering.

data• Clear opening approx. 690mm

x 535mm.• Lightweight high impact

polystyrene.• White finish - requires no

painting.• Door contains provisional

insulation.• Available individually.

Type LADloft access door

• Fully finishes - ready to use

• Insulated fully removable door for easy access

• Integral resi-seals

• Provides uniform build quality and appearance• Ready finished

• Optional insulation upgrade

• Integral latch

53mm

48m

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The insulated door is fully removable for unrestricted access

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Type VG Valley Gutter

useTo link and permit bonding of twodissimilar roof finishes.

introductionThere is a requirement to linkand bond different roof finisheswhere they meet within a common slope. The RoofBonding Strip is moulded withwater-check ribs either side of a central mortar adhesion area.

Produced to an overall width of230mm, the Type RBS is fireresistant in accordance with BS476, the classification being toP60 (SAB) class three. It effectively creates anunderlying bridge betweenabutting surfaces and may beused as part of a fire-break detail,as defined within the BuildingRegulations.

This product may normally beused on roof pitches from 10degrees up to 60 degrees.

data• Glass reinforced polyester.• Colour lead grey.• 230mm wide x 3000mm long.• Pre-shaped for immediate use.• Lightweight and easy to

handle.• Available individually.

useWeatherproof and waterproofpreformed valleys.

introductionPreformed Valley Gutters aremanufactured from GRP andprovide an alternative to the sitefabricated lead valley. Two stylesare available for use with slateroofs or tiled roofs. Both arefinished with a tough bonded filmcoat which is coloured toresemble lead and providesexcellent weathering qualities.

The Valley Gutter for tiles (VG-T)has integral water-check ribs toits sides and two sanded mortaradhesion strips. The Valley Gutterfor slates (VG-S) is of a deeperprofile. Both may be used tosatisfy the requirements of roofsconstructed to BS5534:Part1:1990 (Slating & Tiling) and Part6 of BS8000.

Type VG Valley Gutters are fireresistant in accordance withBS476, the classification to P60(SAB) class three.

data• GRP with film/gel coat.• Available in lengths of 3 metres.• Colour grey.• Preformed profile.• Integral water check ribs.• For pitches down to 22

degrees.• VG-S (slate) 330 x 300mm • VG-SE (slate extra wide) 400 x

3000mm.• VG-T (tile) 350 x 3000mm.• Available in packs containing


Type RBS

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roof bonding strip for slates and tiles• Links different roof finishes

• Pre-shaped for immediate use


• Suitable for roof pitches from 10 degrees up to 60 degrees

VG-S slate roofs VG-T tiled roofs• Pre-shaped for immediate use


• Traditional finish appearance

• Suitable for pitches 22 degrees to 60 degrees

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Dimensions of the Type RBS roof bonding strip.

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330

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Dimensions of Type VG - Tile.

Dimensions of Type VG - Slate.

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Cavilinks

useCaulking compound for pointingpurposes where lead flashing isreturned into mortar joists. Alsosuitable for sealing lead flashing,chase filling etc.

introductionSilicon based one part caulkingcompound based upon a neutralcuring system. Specific gravityapproximately 1.12. Practicalelongation 25%. Skin time 30minutes. Cure time 3 to 6 daysdepending on temperature.

Note Preformed cavitrays withattached lead flashings areconventionally flush-pointedwhen being built-in and do not

require siliconbond. This productis for applications where ‘pointingin’ is normally carried out at alater date. It may be used toaddress the recommendations ofthe Lead Sheet Association.Suitable for use with ourFlashing Anchoring Strip (FAS).

data• Clear/translucent finish

harmonises with allmortar/masonry colours.

• Supplied in 310ml cartridges.(Shelf life six months.)

• One part cartridge appliedsystem.

• Neutral and moisture curing.• Absorbs thermal movement

between lead and masonry.

useProvides fixing method of joiningnew masonry skin at right anglesto existing masonry skin.

introductionMasonry Attachments permit anew wall to be linked to anexisting wall without cutting andkeying the existing masonry. EachMasonry attachment accepts asingle skin of standard thicknessand is accompanied with ties thatslide to harmonise with therequisite course levels.

Technically best practicedictates the new wall cavityruns into the existing wall cavityto maintain a void against damp

transmission. However a speedyalternative method ofcompliance using our Type Bvertical cavitray necessitates thecutting of a slot only.

data• Material: stainless steel• Each pack contains sufficient

to tie-in one 2400mm highmasonry skin.

• (2no lengths 42mm x 1200mm+ 10no. ties + plugs and fixings).

• Accepts brickwork or blockwork.

• For wall widths from 60mm to250mm.

• Suitable for most single andtwo storey applications.

Siliconbondsilicon caulking compound

• Efficient pointing-in and sealing

• Absorbs thermal movement between materials

• Will not crack or absorb water

• Adhesion with elasticity

masonry attachment profiles• Speedy linking of new and old masonry

• Lateral and longitudinal restraint

• Compatible with vertical integrity cavitray

• Suits brickwork and block work

Specifying and Ordering

Contact information

Our conditions of supply apply in all instances. A copy of the company’s terms andconditions is available upon request. Cavity Trays ltd shall not be liable for anyconsequential loss whether this arises from a breach of duty in contract or any otherway. Quoted despatch dates and carriage methods apply to the anticipated date ofdispatch and the anticipated mode of carriage only and speed shall not form any partof any contract. As part of our continuous product development, we reserve the rightto amend or change specifications without notice.

ADS 013/97 Cavity Trays (ETA)

RIBA Product Selector

Type N Sitesealer

Members of the Radon Council.

Confirmed Cavitrays meettechnical requirements

Cavity Trays LimitedAdministration CentreYeovil Somerset BA22 8HU

telephone 01935 474769

fax 01935 428223

email [email protected]

web www.cavitytrays.com

freephone help desk 0800 7311779

• Cavity Trays

• Flashings

• Membranes

• Cavity Closers

• Cavity Fire Stops

• Arches

• Undersill trays

• Common opening and

lintel trays.

• Threshold trays

• DPC

• Pre-shaped damp

courses

• Cloaks

• Parapet wall trays

• Sloping and horizontal

gable abutment trays.

• Curved cavity trays

• Lead fabrications

• Masonry support trays

and restraining straps

• Weeps

• Rain screen baffles

• Arresting barriers

• Stopends

• Flashing anchoring strips

• Gas / contaminated land

protection

Our products are available through buildersmerchants. Freephone us on 0800 7311779and we will be pleased to direct your orderthrough an outlet servicing your area.

When specifying, state clearly Cavity Trays ofYeovil followed by the product details. This willhelp prevent substitution so you receive theproducts of your choice accompanied with ourproduct performance liability protection.

Please see our main manual for standardsreferences. Request your copy of the Main Technical Manual Number 16, forinformation on:

In 1920 a West Country family ofbuilders started making their own dampcourses, flashings and cavitrays, thefourth generation of the same familycontinue the tradition. The Company isnow called Cavity Trays Ltd.

The building envelope has ventilationrequirements in addition to those ofdamp protection, and this publicationlists the ventilation solutions availablefrom Cavity Trays Ltd.

All are subject to the same stringentmanufacturing qualities and areproduced to a quality managementsystem conforming with BSEN ISO9001: 2000.

By clearly specifying Cavity Trays Ltdwhen selecting your ventilation choicesas well as your damp protectionchoices, you will receive warrantedproducts with accompanying productliability protection.

enjoy the benefit of fourgenerations of experience

Cavity Trays LimitedAdministration CentreYeovil SomersetBA22 8HU EnglandTelephone 01935 474769Facsimile 01935 428223www.cavitytrays.com

2984 cavity ventilation brochure 2006 - cavity trays … ventilation brochure.pdf · be ventilated...

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