breathable membrane for unventilated pitched roofs · 2021. 2. 21. · kingspan nilvent™ sealed...

Next generation breathable membranetechnology

Completely waterproof - can be used asa temporary waterproof roof covering

Non-tenting

Completely air-tight – not micro-porous

Excellent water vapour permeability - nocondensation risk

Strong - excellent nail tear and tensilestrengths

Quiet under wind loading

Durable - heat and UV stable

Lifetime guarantee

Self-sealing around nail penetrations

Lightweight

Easy to handle and install

Ideal for newbuild

Environmentally friendly - HCFC/CFC-free with zero Ozone Depletion Potential

BBABRITISHBOARD OFAGRÉMENT

CERTIFICATE 01/3855

CI/Sfb

Second Issue November 2002

(47) Ln6 -

B R E A T H A B L E M E M B R A N E F O RU N V E N T I L A T E D P I T C H E D R O O F S

PRE

MIUM

PE

R F O R M

ANCE

EN ISO 9001 : 1994

®

TM

For more information on Kingspan Insulation visit www.barbourproductsearch.info

http://www.barbourproductsearch.info/kingspan-insulation-comp103887.html

VERTICAL INSTALLATION ON A DISCONTINUOUSSUBSTRATE

2

Kingspan

TYPICAL DESIGN DETAILS

Figure 1a FULLY FILLED INSULATION BETWEEN RAFTERS - NO SARKING BOARD

Figure 1b INSULATION OVER RAFTERS- SARKING BOARD/NO SARKING BOARD

Figure 1c INSULATION BETWEEN RAFTERS- SARKING BOARD

Figure 1d INSULATION BETWEEN RAFTERS- SARKING BOARD & NATURAL SLATES

HORIZONTAL INSTALLATION ON A CONTINUOUS SUBSTRATE

Rafter

Insulated plasterboardeg. KingspanThermawall TW56under rafters (can bereplaced with 12.5 mmplasterboard)*/**

Insulation between rafterseg. KingspanThermapitch TP10 orKingspan Kooltherm® K7Pitched Roof Board

150 mm lap between runs ofKingspan nilvent™ sealed(if required) with 75 mmwide double sidedacrylic adhesivetape


Tiles/slates

Tile/slatebatten

38 x 38 mmcounter batten

Kingspannilvent™

Rafter

Insulated plasterboardeg. Kingspan ThermawallTW56 under rafters(can be replacedwith 12.5 mmplasterboard)*/**

Insulation between rafters(partially or fully filling space)eg. Kingspan ThermapitchTP10 or KingspanKooltherm® K7 PitchedRoof Board


Tiles/slates

Tile/slatebatten

38 x 38 mmcounterbatten

18 mmsarkingboard

Kingspannilvent™

Kingspannilvent™

Rafter

Unventilatedair space

Nailablesarking clips(if required)

12.5 mm plasterboard

Insulation over and between (ifrequired) rafters eg. KingspanThermapitch TP10 or KingspanKooltherm® K7 Pitched Roof Board

Tiles/slates

Tile/slatebatten


18 mm sarkingboard (if required)

Rafter

Insulated plasterboarde.g. KingspanThermawall TW56under rafters (can bereplaced with 12.5 mmplasterboard)*/**

Insulation between rafters(partially or fully filling spaceeg. Kingspan ThermapitchTP10 or KingspanKooltherm® K7 PitchedRoof Board


Slates

18 mm sarkingboard

Kingspannilvent™

Rafter

Timber batten

Insulation partially filling the space between rafters eg. Kingspan ThermapitchTP10 or KingspanKooltherm® K7 PitchedRoof Board

Insulated plasterboard eg.Kingspan Thermawall TW56under rafters (can be replacedwith 12.5 mm plasterboard)*/**

100 mm lap between runs ofKingspan nilvent™ sealedby the placement of thecounter batten

Tiles/slates


Kingspannilvent™

Figure 1e INSULATION OVER RAFTERS- SARKING BOARD AND NATURAL SLATES

Rafter

Nailable sarking clips(if required)

Insulation over and between(if required) rafterseg. Kingspan ThermapitchTP10 or KingspanKooltherm® K7 PitchedRoof Board


Slates

18 mm sarkingboard

Kingspannilvent™

Unventilatedair space

Figure 2a PARTIALLY FILLED INSULATION BETWEEN RAFTERS - NO SARKING BOARD

Tile/slatebatten

12.5 mm plasterboard*

Unventilated air space(25 mm min.) aboveinsulation

TM


3

Figure 3a PARTIALLY FILLED INSULATION BETWEEN RAFTERS - NO SARKING BOARD

Figure 3b INSULATION OVER RAFTERS- SARKING BOARD/NO SARKING BOARD

HORIZONTAL INSTALLATION ON A DISCONTINUOUS SUBSTRATE

Figure 3c INSULATION BETWEEN RAFTERS- SARKING BOARD

Rafter

Insulated plasterboardeg. Kingspan Thermawall TW56 under rafters(can be replaced with 12.5 mm plasterboard)*/**

Insulation partially filling thespace between rafters eg.Kingspan ThermapitchTP10 or KingspanKooltherm® K7 PitchedRoof Board

225/150 mm lap(depending on pitch)between runs ofKingspan nilvent™

Tiles/slates

Tile/slatebattens

Timberbatten

Air space(25 mm min.) aboveinsulation to provide a space todrape the Kingspan nilvent™

Kingspannilvent™

Rafter


Tiles/slates

Tile/slatebattens

Air space (25 mm min.) above sarkingboard or insulation (if no sarking board) to providea space to drape the Kingspan nilvent™

Kingspannilvent™

Insulation over and between (if required)rafters eg. Kingspan ThermapitchTP10 or Kingspan Kooltherm®

K7 Pitched Roof Board

Unventilatedair spaceNailable sarkingclips (if required)

12.5 mm plasterboard

38 x 38 mmcounter battens

Rafter

Insulated plasterboardeg. KingspanThermawall TW56under rafters (can bereplaced with 12.5 mmplasterboard)*/**


Insulation between rafters (partially orfully filling space) eg. KingspanThermapitch TP10 orKingspan Kooltherm®

K7 PitchedRoof Board

Tiles/slates

Tile/slatebatten

38 x 38 mmcounterbatten

18 mmsarkingboard

Kingspannilvent™

* The requirement for a vapour control layer and/or under the tileventilation should be assessed to BS 5250: 1989 (1995).Vapour check plasterboard or a separate vapour control layercan be used as preferred.

** Kingspan Thermawall TW56 contains an integral vapourcontrol layer.

SPECIFICATION CLAUSE

Kingspan nilvent™ should be described inspecifications as:- The breathable membrane shall beKingspan nilvent™ comprising a non-microporous,laminated 3-layer polyolefin construction and shall beapplied in accordance with the instructions issued byKingspan Insulation Limited.

Details also available in NBS PLUS.NBS users should refer to clauses:H60 240, H61 240, H62 240, H30 350 andH31 350 (Standard and Intermediate).

DESIGN CONSIDERATIONS

DESIGN FOR HORIZONTAL INSTALLATION ON ACONTINUOUS SUBSTRATEIn these cases, the breathable sarking membrane isinstalled either under counter battens, which provide achannel for water drainage (figures 1a-1c), or insituations with a sarking board under a natural slateroof, directly under the slates (as neither tile battensnor counter battens are used) (figures 1d and 1e).

The membrane is laid taut and joints between runs ofmembrane are sealed with tape, if required.

DESIGN FOR VERTICAL INSTALLATION ON ADISCONTINUOUS SUBSTRATEKingspan nilvent™ is installed in vertical runs, fromeaves to eaves, in one length, under counter battens(see Figure 2a). Installed in this way there will be nolaps along the length of a run and laps between runscan be formed over a rafter where counter-battenscan secure them and make an airtight joint.The membrane should be laid taut with no valleysbetween rafters.

NB it is theoretically possible to install the membrane vertically with avalley between rafters, however this adds no technical benefit, willprove cumbersome and has the disadvantage of allowing greaterwind induced membrane movement (see section on ‘Wind InducedMembrane Movement’).

NBS

P

L U

SP

LU

S

18mm sarkingboard (if required)


4

DESIGN FOR HORIZONTAL INSTALLATION ON ADISCONTINUOUS SUBSTRATEIn situations where there is no continuous surface (seeFigure 3a-3c) the breathable sarking membrane canbe draped over the rafters or counter battens toprovide a channel for water drainage. There shouldbe a minimum 10 mm gap between the membraneand the tile/slate batten to afford a drainage channelfor any penetrating rain. No counter-batten is requiredabove the Kingspan nilvent™ as water can freelydrain under the tile/slate battens. NB it is possible to have the membrane laid taut with counter battensabove. This is not as practical and incurs the cost penalty of extracounter battens. It does, however, have the advantage of allowingreduced wind induced membrane movement (see section on ‘WindInduced Membrane Movement’).

In these situations, it is not at all practical to seal thelaps between the runs of Kingspan nilvent™ and theroof should be considered as being unsealed.

GENERALKingspan nilvent™ meets all of therecommendations and requirements for underlaysdetailed in BS 5534: Part 1: 1997 (Code of practicefor slating and tiling. Design) and NFRC TechnicalBulletin 6.

WATERPROOFINGIf installed as per the instructions given in thisdocument Kingspan nilvent™ will give a completelywatertight structure. Kingspan nilvent™ is inherentlycompletely watertight, being non-microporous, andhas the added advantage of self-sealing around nailpenetrations. These properties mean that Kingspannilvent™ can be safely used even in constructionswith a large number of nail penetrations through themembrane e.g. where natural slates are naileddirectly into a sarking board.

VENTILATION AND CONDENSATION RISKMost buildings contain air that is more humid than the airoutside of that building. This humidity differential drivesthe moisture from the inside to the outside of a building’sstructure. When the moisture is confronted with arelatively cold and impermeable layer it may condense.In pitched roofs, sarking felt can be such a layer.

The traditional way of avoiding the risk of condensationin roofs is to ventilate the moisture away by introducingairflow directly above the insulation layer and below thesarking felt. Modern remedies for roofs include the use ofbreathable membranes to replace sarking felt.

Breathable membranes negate the need for ventilationdirectly above the insulation layer. They do thisbecause they have a low vapour resistance, whichallows water vapour to escape through the breathablemembrane to the outside of the building. Recentstudies have shown that ventilation directly above aninsulation layer can reduce its thermal efficiency.

BS 5250: 1989 (1995) (Code of practice for controlof condensation in buildings) states that the vapourresistance of the breathable sarking membrane mustnot exceed 0.25 MN.s/g. Kingspan nilvent™ hasa vapour resistance of 0.11 MN.s/g. Any watervapour reaching Kingspan nilvent™ escapesthrough it without condensing.

There must be adequate provision for vapour todisperse to atmosphere outside of Kingspannilvent™.

For horizontal installation on a continuous substrateand for vertical installation, Kingspan Insulationrecommends the use of minimum 25 mm thick counter-battens, to create a suitable airspace above thebreathable membrane. By keeping the tile/slatebattens clear of Kingspan nilvent™, counter-battensencourage air movement. They also allow the dustand debris from tiling and slating to slide down theslope and emerge at the eaves. The use of counter-battens also makes it easier to achieve interconnectingairspaces at interruptions to the main roof area –such as roof windows, chimneys, dormers, hips, andvalleys.

For horizontal installation on a discontinuous substrate,counter battens are not necessary to provide airmovement. As long as Kingspan nilvent™ is drapedsuch that there is a minimum 10 mm gap between themembrane and the tile/slate batten, the void socreated will be sufficient.

With some roof coverings (e.g. pantiles, natural slatesand cambered plain tiles), irregularities in theirsurfaces should allow sufficient natural ventilation toremove moisture from the space above the breathablemembrane. With other roof coverings (e.g. sheetmetal, interlocking tiles and artificial slates) provisionof vents to encourage ventilation may be necessary.

Natural slates nailed through Kingspan nilvent™ intoa sarking board without counter battens or slatebattens provide for enough air movement to dispersevapour because of the gaps created by theirregularity of natural slates. Artificial slates may notbe suitable for direct fixing to a sarking boardbecause the regularity of their shape does not providefor enough air movement to disperse vapour. It maybe necessary to put counterbattens and slate battensin place under artificial slates to provide an airspacefor ventilation.

The requirement for under-tile/slate ventilation shouldbe assessed to BS 5250: 1989 (1995) (Code ofpractice for control of condensation in buildings), asshould the requirement of a vapour control layer.

Ventilation beneath the underlay is not required andshould be avoided.

Kingspan TM


5

WIND INDUCED MEMBRANE MOVEMENTWind blowing over a pitched roof generates positiveand negative air pressures. A roof underlay isrequired to reduce the wind loading on thetiles/slates in order to stop them from becomingdetached from the roof. These air pressures can causeunderlays to move up and down. This effect isincreased if the underlay is draped rather thaninstalled taut.

TILE/SLATE DAMAGEUnder extreme conditions, if the membrane stretchesas it moves up and down, it can knock against thetiles/slates and cause damage. The upwarddeflection of the underlay under maximum negativepressure must be small enough to avoid contact withthe underside of the tiles/slates.

Kingspan nilvent™ has mechanical propertiessufficient to prevent this effect, given the wind upliftforces prevalent in the UK and Ireland.

WIND NOISEUnder extreme conditions, underlays can produce anoise irritating to occupants as it moves up anddown. Kingspan nilvent™ is quiet under windloading.

MANSARD ROOFS/WALLSKingspan nilvent™ can be used for the constructionof insulated tiled or slated mansard roofs / walls. Itsapplication on such contracts is identical to thestandard specification, which is given here.

FIRE STOPSCurrent Building Regulations / Standards should beconsidered with regard to the requirements for and/orprovision of fire stops.

AIRTIGHTNESS & SEALED vs. UNSEALEDCONSTRUCTIONSAs we drive for buildings with lower and lowerU-values, in order to save on wasteful heat losses, thecomponent of heat lost from a building directlythrough its fabric becomes less as a proportion oftotal heat lost. The proportion lost by accidental air-leakage becomes more significant. This air-leakage isnot the same as deliberate ventilation. This accidentalair-leakage into a roof can be lessened by sealing theroof construction to make it as airtight as possible.

Recent research has proven that the sealed roofapproach yields a more energy efficient roof as theimpacts of incidental infiltrating cold air are negated.Therefore, if creating an unventilated roof, it ispreferable to fully seal all joints in the breathablesarking membrane with tape. 75 mm wide doublesided acrylic adhesive tape should be used forsealing joints in Kingspan nilvent™.

However, there is limited point in carefully sealing aroof structure if the specified breathable membrane isnot airtight. Kingspan nilvent™ is inherently 100%airtight, being non-microporous, and has the addedadvantage of self-sealing around nail penetrations.

The ideal is to install Kingspan nilvent™ in amanner that is practical and maximises the ability toachieve an airtight construction.

The use of horizontal runs of Kingspan nilvent™ isby far the most practical method of installation,however, it is difficult to achieve air-tightness unlessthe Kingspan nilvent™ is to be laid in thisorientation onto a continuous surface (see Figures 1a-1e). The taping of breathable membrane joints isconsiderably easier to achieve if this is the case.

The use of vertical runs of Kingspan nilvent™ is notas practical a method of installation as horizontalruns, however, it is easy to achieve air-tightness as thelaps between runs are sealed by the counter-battensthat are installed over them (see Figure 2a).

If the sealing of the roof is not deemed to beimperative, horizontal installation without sealing jointswith tape will always be the most practical solutionregardless of whether it is laid onto a continuous ordiscontinuous surface (see Figures 1a-1e and 3a-3c).However, it must be stressed that these roofconfigurations are not recommended on thermalefficiency grounds.


6

INSTALLATION IN A HORIZONTAL ORIENTATIONON A CONTINUOUS SUBSTRATEStart installation at the eaves. Fit an eaves strip of aUV-resistant material to overhang the eaves / fasciaby 50-60 mm. Lap the Kingspan nilvent™ logo-upover the eaves strip (if required), with the bottom edgeof the Kingspan nilvent™ in line with the top of thefascia. Kingspan nilvent™ should be laid taut.Temporarily tack in place with staples or clout nailsand cut to length with a sharp bladed knife.

The second run of Kingspan nilvent™ should lapover the top of the first by the distance shown in thetable below.

Rafter pitch (degrees) Minimum lap (mm)12.5 – 14.5 15015 – 34.5 150>35 150

The printed tramlines on the top surface of Kingspannilvent™ indicate a distance of 150 mm. Use 75mm wide double sided acrylic adhesive tape to sealhorizontal laps between runs of Kingspan nilvent™

(unless otherwise specified).

SITEWORK

Figure 4a EAVES - FULLY SUPPORTED HORIZONTAL INSTALLATION

Vertical laps between lengths of Kingspan nilvent™

should be not less than 100 mm wide and bepositioned so as to coincide with a rafter position.These laps will be secured and sealed by the laterfixing of the counter battens. Avoid vertical laps overthe same rafter position in successive runs of Kingspannilvent™.

NB In constructions with a sarking board under a slated roof with nocounter battens or slate battens, the vertical laps are taped with 75mm wide double sided acrylic adhesive tape and tacked in placewith staples or clout nails.

Continue installation up the roof in the same mannerto the ridge. Install counter-battens (min. 25 mm deep)and tile/slate battens in the usual manner as provesnecessary to fully fix the Kingspan nilvent™ in placeand to provide a support for moving up the roof.

Lap over the ridge by not less than 150 mm eachside (total overlap of 300 mm).

Complete the installation of counter-battens andtile/slate battens over the whole area installed.

NB In constructions with a sarking board under a slated roof with nocounter battens or slate battens, Kingspan nilvent™ is laid over thewhole roof using roof ladders or similar for access prior to slating.

Kingspan nilvent™

lapped over eaves strip

Eaves strip

Line of rafter

Kingspan nilvent™

laid taut in horizontal runsHorizontal lap joint tapedunless otherwise specified

Continuous substrate i.e.sarking board, insulation overrafters or insulation betweenrafters and rafters

Second run of Kingspan nilvent™

lapping over first by 150 mm (min)

Vertical lap not less than 100 mmwide and positioned over a rafter

Kingspan TM


7

Figure 4b EAVES - FULLY SUPPORTED HORIZONTAL INSTALLATION WITH NATURAL SLATES

Figure 4c RIDGE - FULLY SUPPORTED HORIZONTAL INSTALLATION

Figure 4d RIDGE - FULLY SUPPORTED HORIZONTAL INSTALLATION WITH NATURAL SLATES

Kingspan nilvent™


Eaves strip

Line of rafter

Kingspan nilvent™

laid taut in horizontal runsHorizontal lap joint tapedunless otherwise specified

Sarking board formingcontinuous substrate


lapping over first by 150 mm (min)

Vertical lap not less than 100 mmwide and positioned over a rafter.Lap is taped.

Kingspan nilvent™

laid taut in horizontal runs

Continuous substrate i.e.sarking board, insulationover rafters or insulationbetween rafters andrafters

Kingspan nilvent™ lapped overridge by 150 mm (min)

Kingspan nilvent™



Kingspan nilvent™ lapped overridge by 150 mm (min)

Line of rafter

Line of rafter


8

INSTALLATION IN A VERTICAL ORIENTATION ON ADISCONTINUOUS SUBSTRATEFor ease of installation, thread a wood or metal barthrough the core of the Kingspan nilvent™ roll andset it on bearers on the scaffold platform. The leadingedge of the Kingspan nilvent™ can then be takenup and over the ridge and down to the oppositeeaves.

Fit an eaves strip of a UV-resistant material tooverhang the eaves / fascia by 50-60 mm. Lap theKingspan nilvent™ logo-up over the eaves strip(if required), with the bottom edge of the Kingspannilvent™ in line with the top of the fascia. Kingspannilvent™ should be laid such that it is taut in bothhorizontal and vertical directions. Each run ofKingspan nilvent™ should be installed in a singlepiece from eaves to eaves. Temporarily tack in placewith staples or clout nails, cut to length with a sharpbladed knife, move sideways and repeat the process.

The second run of Kingspan nilvent™ should lapover the first be not less than 100 mm and bepositioned so as to coincide with a rafter position.The printed tramlines on the top surface of Kingspannilvent™ indicate a distance of 150 mm. Theselaps should be secured and sealed by the fixing ofcounter-battens (min. 25 mm deep) as workprogresses across the roof. Counter battens should befixed at 300 mm centres.

Continue installation across the roof in the samemanner, then install tile/slate battens over the wholearea installed.

NB Kingspan nilvent™ can be laid in a vertical orientation with adrape. However, counter battens will still be required to give aneffective seal. If sealing of the roof is not required and counterbattens are not specified, it will prove a lot easier to install Kingspannilvent™ horizontally with a drape.

Figure 5a EAVES - VERTICAL INSTALLATION

Figure 5b RIDGE - VERTICAL INSTALLATION

Kingspan nilvent™

laid over eaves strip

Eaves strip

Line of rafter

Kingspan nilvent™

laid taut in vertical runs

Rafters forming adiscontinuous substrate

Kingspan nilvent™

laid taut in vertical runsRafters forming adiscontinuous substrate

Vertical lap not less than100 mm wide andpositioned over a rafter

Single run ofKingspan nilvent™

taken from eaves toeaves over ridge

Line of rafter

Kingspan TM


9

INSTALLATION IN A HORIZONTAL ORIENTATIONON A DISCONTINUOUS SUBSTRATEStart installation at the eaves. Fit an eaves strip of a UV-resistant material to overhang the eaves / fascia by 50-60 mm. Lap the Kingspan nilvent™ logo-up over theeaves strip (if required), with the bottom edge of theKingspan nilvent™ in line with the top of the fascia.Kingspan nilvent™ and the eaves strip should be laidin such a manner as to create a valley between rafters(Figure 3a) or counter battens (Figures 3b-3c) to allowwater drainage. Temporarily tack in place with staples orclout nails and cut to length with a sharp bladed knife.The second run of Kingspan nilvent™ should lapover the top of the first by the distance shown in thetable below.

Rafter pitch (degrees) Minimum lap (mm)12.5 – 14.5 22515 – 34.5 150>35 150

The printed tramlines on the top surface of Kingspannilvent™ indicate a distance of 150 mm.

It is not at all practical to attempt to seal the lapsbetween the runs of Kingspan nilvent™.

Vertical laps between lengths of Kingspan nilvent™

should be not less than 100 mm wide and bepositioned so as to coincide with a rafter or counter-batten position. These laps will be secured and sealedby the later fixing of the tile/slate battens. Avoid verticallaps over the same rafter or counter-batten position insuccessive runs of Kingspan nilvent™.

Continue installation up the roof in the same mannerto the ridge. Install tile/slate battens in the usualmanner as proves necessary to fully fix the Kingspannilvent™ in place and to provide a support formoving up the roof.

Lap over the ridge by not less than 150 mm eachside (total over lap of 300 mm).

Complete the installation of tile/slate battens over thewhole area installed.NB Kingspan nilvent™ can be laid taut without draping on adiscontinuous substrate. In which case, install as in the method givenabove for horizontal installation on a continuous substrate. Effectivetaping of joints will prove extremely difficult.

Figure 6a EAVES - DRAPED HORIZONTAL INSTALLATION

Figure 6b RIDGE - DRAPED HORIZONTAL INSTALLATION

Kingspan nilvent™


Eaves strip

Kingspan nilvent™

draped over timbers inhorizontal runs

Rafters/counter battensforming a discontinuoussubstrate

Vertical lap not less than100 mm wide andpositioned over a rafter

Horizontal lap joint

Kingspan nilvent™


Rafters/counter battens forming adiscontinuous substrate

Kingspan nilvent™

lapped over ridge by150 mm (min)


lapping over first by 225/150 mm(depending on pitch)

Line of rafter

Line of rafter


10

ABUTMENTSAt any abutment, chimney stack or similar roofpenetration, apply 1.5 mm butyl rubber tape (e.g.glazing tape) to the abutment. Turn up the Kingspannilvent™ at least 50 mm under the flashing andsecure it with a counter batten/tiling batten pressedfirmly against the abutment and fixed to the end rafteror trimmer.

In constructions with a sarking board under a slatedroof with no counter battens or slate battens, theabove method is followed without the batten to securethe membrane.

Figure 7a ABUTMENTS - FULLY SUPPORTED HORIZONTAL INSTALLATION

Figure 7b ABUTMENTS - FULLY SUPPORTED HORIZONTAL INSTALLATION WITH NATURAL SLATES

Figure 7d ABUTMENTS - DRAPED HORIZONTAL INSTALLATION

Figure 7c ABUTMENTS - VERTICAL INSTALLATION

Kingspan nilvent™

turned up by50 mm (min.)

Flashing

1.5 mm butyl rubbertape e.g. glazing tape

Line of rafter

Line of rafter

Line of rafter

Line of rafter

Kingspan nilvent™


Continuous substrate i.e.sarking board, insulationover rafters or insulationbetween rafters and rafters

Kingspan nilvent™


Flashing


Kingspan nilvent™


Kingspan nilvent™


Flashing


Kingspan nilvent™


Sarking board forming acontinuous substrate

Rafter formingdiscontinuous substrate

Kingspan nilvent™


Flashing


Kingspan nilvent™

draped over timbers in horizontal runs

Rafter/counter battensforming discontinuoussubstrate

Kingspan TM


11

VERGESExtend the Kingspan nilvent™ across the gable walland overhang. Turn it up at least 50 mm behind thefascia board before fixing with a batten to the flyingrafter.

Where no counter battens are used, extend theKingspan nilvent™ across the gable wall andoverhang, and extend it to fully cover the undercloak.

Figure 8a VERGES - FULLY SUPPORTED HORIZONTAL INSTALLATION

Kingspan nilvent™

laid taut inhorizontal runs

Continuous substratei.e. sarking board,insulation over raftersor insulation betweenrafters and rafters.

Line of rafter

Flying rafter

Kingspan nilvent™

turned up by 50 mm(min.)

Undercloak

Fascia board

Mortar infill

Figure 8c VERGES - VERTICAL INSTALLATION

Kingspan nilvent™

laid taut invertical runs

Rafter formingdiscontinuoussubstrate

Flying rafter

Kingspan nilvent™

turned up by 50 mm(min.)

Undercloak

Fascia board

Mortar infill

Figure 8b VERGES - FULLY SUPPORTED HORIZONTAL INSTALLATION WITH NATURAL SLATES

Sarking boardformingcontinuoussubstrate

Kingspan nilvent™


Flying rafter

Kingspan nilvent™

fully covering theundercloak

Fascia board

Mortar infill

Figure 8d VERGES - DRAPED HORIZONTAL INSTALLATION

Kingspan nilvent™

draped over timbersin horizontal runs

Rafter/counter battensforming discontinuoussubstrate

Flying rafter

Kingspan nilvent™

fully covering theundercloak

Fascia board

Mortar infill

Line of rafter

Line of rafter

Line of rafter


12

HIPSFit the Kingspan nilvent™ to the hipped end of theroof before covering the main roof area.

Pull the Kingspan nilvent™ over the hip rafter andtrim off the surplus, leaving at least 150 mm overlap.Secure in the same manner as for the main roof area.Once the hipped end is covered, move round andlay Kingspan nilvent™ on the main roof area. Foldover hip rafters and trim off surplus material.

Figure 9a HIPS - FULLY SUPPORTED HORIZONTAL INSTALLATION

Figure 9b HIPS - FULLY SUPPORTED HORIZONTAL INSTALLATION WITH NATURAL SLATES

Figure 9d HIPS - DRAPED HORIZONTAL INSTALLATIONFigure 9c HIPS - VERTICAL INSTALLATION

Kingspan nilvent™

laid taut in horizontal runsContinuous substratei.e. sarking board,insulation over rafters orinsulation betweenrafters and rafters

150 mm (min.)overlap

Kingspan nilvent™


Rafters formingdiscontinuous substrate


Kingspan nilvent™

laid taut in horizontal runsSarking board formingcontinuous substrate


Kingspan nilvent™


Rafters/counter battensforming a discontinuoussubstrate


Line of rafter

Line of rafter

Line of rafter

Line of rafter

Kingspan TM


13

VALLEYSLay the Kingspan nilvent™ along the main roof areauntil you reach the valley. Fold the Kingspan Nilventinto the valley. Trim off surplus leaving not less than300 mm of material beyond the centre line of thevalley. Laid in this way there is no need to apply aseparate strip of Kingspan nilvent™ in the valley.

Cut counter-battens (if required) short of the valley toencourage air movement and allow run-off of anywater penetrating the tiles/slates.

Kingspan nilvent™ forms an excellent underlaybeneath zinc, lead or GRP valley gutter liners.

Figure 10a VALLEYS - FULLY SUPPORTED HORIZONTAL INSTALLATION

Counter battens cut short of valleyto encourage air movement andallow run-off

Kingspan nilvent™


Continuous substrate i.e.sarking board, insulation overrafters or insulation betweenrafters and rafters

Kingspan nilvent™

to extend 300 mm (min.)beyond valley centre line

Line of rafter

Kingspan nilvent™

lapping over by150 mm (min.)

Figure 10c VALLEYS - VERTICAL INSTALLATION

Counter battens cut short of valleyto encourage air movement andallow run-off

Kingspan nilvent™


Kingspan nilvent™


Kingspan nilvent™


Figure 10d VALLEYS - DRAPED HORIZONTAL INSTALLATION

Kingspan nilvent™


Rafters/counterbattens forming adiscontinuous substrate

Kingspan nilvent™


Kingspan nilvent™


Figure 10b VALLEYS - FULLY SUPPORTED HORIZONTAL INSTALLATION WITH NATURAL SLATES

Kingspan nilvent™


Kingspan nilvent™


Kingspan nilvent™



Line of rafter

Line of rafter Line of rafterRafters forming adiscontinuous substrate


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ROOFLIGHTSPlease refer to the instructions provided by therooflight manufacturer. In the absence ofmanufacturer’s information, cut and fit Kingspannilvent™ neatly around the rooflight kerb with aaluminium upstand of 50 mm. Seal the underlay tothe kerb all round using 1.5 mm butyl rubber tape(e.g. glazing tape).

PIPE PENETRATIONSAll pipe penetrations, Kingspan nilvent™ is star cutand dressed up the side of the penetrations. Use tapeto seal the Kingspan nilvent™ around the pipe.

DAMAGE REPAIRWhilst Kingspan nilvent™ is strong and durable innormal use, it may be damaged by careless handling.The risk of damage may be increased if Kingspannilvent™ is left uncovered on the roof for longerthan is necessary. Any repairs are normally carriedout with self-adhesive tape before installation of theouter leaf.

SLATING AND TILINGIt is often necessary for the roof underlay to act as atemporary roof covering before tiles or slates areinstalled. Kingspan nilvent™ is UV resistant and canbe safely exposed on site for a period not exceeding4 months.

Slating and tiling over Kingspan nilvent™ is exactlythe same as on any other pitched roof except that insome instances the slate / tile battens (if required) arefixed to the previously applied counter-battens.

CUTTINGCutting should be carried out using a sharp bladedknife.

AVAILABILITYKingspan nilvent™ is available through specialistinsulation distributors and selected merchantsthroughout the UK and Ireland.

PACKAGINGRolls are delivered to site individually wrapped inpolythene. Each roll contains a label bearing thecompany name, address and telephone number, andfixing instructions.

STORAGEThe packaging of Kingspan nilvent™ should not beconsidered adequate for long term outside protection.Ideally rolls should be stored inside a building. Ifhowever, outside storage cannot be avoided the rollsshould be stored on their sides on a clean dry surfaceand protected from sunlight.

HEALTH AND SAFETYKingspan nilvent™ is chemically inert and safe touse. A leaflet on this topic which satisfies therequirements set out in the Control of SubstancesHazardous to Health Regulations 1988 (COSHH) isavailable from our Technical Services Department (seerear cover).

Please note that the white upper surface on this product is designedto enhance its performance. This surface will reflect light, includingultraviolet light. Therefore, if this membrane is being installed duringvery bright or sunny weather, it is advisable to wear UV protectivesunglasses or goggles, and if the skin is exposed for a significantperiod of time, to protect the bare skin with a UV block sun cream.

Warning – do not stand on or otherwise support your weight on thismembrane unless it is fully supported by a load-bearing surface.

PRODUCT DESCRIPTION

COMPOSITIONKingspan nilvent™ comprises a non-microporous,laminated, 3-layer polyolefin construction. The toplayer provides protection from UV andmechanical damage. The middle layer isthe functional layer. The bottom layerprovides abrasion resistance. Kingspannilvent™ has a light grey upper surfaceprinted with the Kingspan nilvent™

logo, and a charcoal grey lower surface. Kingspannilvent™ is manufactured without the use ofCFCs/HCFCs and has zero Ozone DepletionPotential (ODP).

PRODUCT DATA

STANDARDS AND APPROVALSKingspan nilvent™ is manufactured to the higheststandards under a quality control system approved toEN ISO 9001: 1994 (Quality systems. Model forquality assurance in production, installation andservicing). Its use is covered by BBA Certificate01/3855.

®

BBABRITISHBOARD OFAGRÉMENT

CERTIFICATE 01/3855 EN ISO 9001 : 1994

Kingspan TM


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STANDARD DIMENSIONSKingspan nilvent™ is available in the followingdimensions:

Nominal Dimension AvailabilityRoll Length (m) 50 Roll Width (m) 1.5Thickness (mm) 0.47Area per Roll (m2) 75Weight (kg/m2) 0.15Weight per Roll (kg) 11.25

WATER VAPOUR RESISTANCEKingspan nilvent™ achieves a resistance of 0.11MN.s/g when tested in accordance with BS 3177:1959 (1995) (Method for determining thepermeability to water vapour of flexible sheetmaterials used for packaging).

LIQUID WATER PENETRATION RESISTANCEKingspan nilvent™ achieves a resistance of >2 mwhen tested in accordance with BS EN 20811:1992 (1996) (Textiles. Determination of resistance towater penetration. Hydrostatic pressure test).

Kingspan nilvent™ is non-tenting and can be fully orpartially supported.

AIR PERMEABILITYKingspan nilvent™ is non-microporous and thereforeis 100% airtight when tested in accordance with ISO5636-3: 1992 / BS 6538: Part 2: 1992 (Methodfor determination of air permeance using the Bendtsenapparatus).

TENSILE STRENGTHKingspan nilvent™ achieves a longitudinal andtransverse tensile strength of 400 N/5cm when testedin accordance with BS EN ISO 527-1: 1996 (Plastics.Determination of tensile properties. General principles).

NAIL TEAR STRENGTHKingspan nilvent™ achieves a nail tear strength of86 N in the transverse direction and 89 N in thelongitudinal direction when tested in accordance withMOAT No. 27: 5.4.1: 1983 (General directive forthe assessment of roof waterproofing systems).

MULLEN BURST STRENGTHKingspan nilvent™ achieves a mullen burst strengthof 520 kN/m2 when tested in accordance with BS3137: 1972 (1995) (Methods for determining thebursting strength of paper and board).

COEFFICIENT OF DYNAMIC FRICTIONKingspan nilvent™ achieves a coefficient of dynamicfriction of 0.93 F when dry and 0.44 F when wet whentested in accordance with BBA test method TI/10.

UV / HEAT AGEINGKingspan nilvent™ achieves class A (the highestperformance) when tested in accordance with prEN13859-1(Flexible sheets for waterproofing –Definitions and characteristics of underlays – Part 1:Underlays for discontinuous roofing).

This result means that Kingspan nilvent™ maintainsadequate functional performance after continuousexposure to UV light at 50-53°C for 336 hours andthen continuous exposure to a temperature of 70°Cfor 90 days.

Kingspan nilvent™ can be left exposed on a rooffor a period of up to 4 months.

WIND NOISE SENSITIVITYKingspan nilvent™ is quiet when exposed to thewind uplift forces prevalent in the UK and Ireland.

GUARANTEE / DURABILITYIf installed according to the instructions given in thisdocument, Kingspan nilvent™ is guaranteed fit forpurpose for the service life of the roof covering.

DISPOSALKingspan nilvent™ can be disposed of at end of lifein a conventional manner. It does not contain anytoxic components.

RESISTANCE TO SOLVENTS, FUNGI & RODENTSKingspan nilvent™ resists attack by mould andfungus growth and will not encourage insect attack.

Kingspan nilvent™ is resistant to most organic andinorganic chemicals including acids, alkalis and salts.Direct contact with wet solvents causes temporaryexpansion and a slight loss of physical properties.Kingspan nilvent™ is not affected by timberpreservatives and treatments traditionally used in theUK and Ireland to protect timber from rotting, evenwhen they are not fully dried out.

FIRE PERFORMANCEKingspan nilvent™ melts and shrinks away from heatbut will burn in the presence of an ignition source.

The use of Kingspan nilvent™ does not affect the firerating of a roof construction. Kingspan nilvent™,when subjected to fire tests, achieves the results givenbelow. Further details of the fire performance ofKingspan Insulation products may be obtained fromour Technical Services Department (see rear cover).

Test ResultDIN 4102: 1981 B2

LIMITING TEMPERATURESKingspan nilvent™ retains its strength and flexibilityat temperatures down to -73°C. Kingspan nilvent™

will perform satisfactorily at temperatures up to 100°C.


I N S U L A T I O N

Kingspan InsulationPembridge, Leominster, Herefordshire HR6 9LA, UK

Castleblayney, County Monaghan, Ireland

® Kingspan, Kooltherm, the zo Device and the Lion Device are Registered Trademarks of the Kingspan Group plcTM Nilvent is a Trademark of the Kingspan Group plc

www.insulation.kingspan.com

CUSTOMER SERVICE

For quotations, order placement and details of despatchesplease contact our Building Fabric Insulation CustomerServices Department on the numbers below:

UK – Telephone: +44 (0) 870 850 8555– Fax: +44 (0) 870 850 8666– email: [email protected]

Ireland – Telephone: +353 (0) 42 97 95000– Fax: +353 (0) 42 97 46129– email: [email protected]

TECHNICAL ADVICE

Kingspan Insulation Ltd support all of their products with acomprehensive Technical Advisory Service for specifiers,stockists and contractors.

This includes a free computer-aided service designed to givefast, accurate technical advice. Simply phone our

with your project specification and we canrun calculations to provide U-values, condensation/dewpoint risk, required insulation thicknesses etc… Thereafter wecan run any number of permutations to help you achieveyour desired targets.

We can also give general application advice and advice ondesign detailing and fixing etc... Site surveys are alsoundertaken as appropriate.

Please contact our Building Fabric Insulation TechnicalServices Department on the numbers below:

LITERATURE AND SAMPLES

Kingspan Insulation produces a comprehensive range oftechnical literature for specifiers, contractors, stockists andend users. The literature contains clear ‘user friendly’ adviceon typical design; design considerations; thermal properties;sitework and product data.

Available as a complete Design Manual, on CD-ROM or asindividual product brochures, Kingspan Insulation technicalliterature is an essential specification tool. For copies pleasecontact our Marketing Department on the numbers below:



GENERAL ENQUIRIES

For all other enquiries contact Kingspan Insulation on thenumbers below:



Kingspan Insulation reserve the right to amend product specificationswithout prior notice. The information, technical details and fixinginstructions etc. included in this literature are given in good faith andapply to uses described. Recommendations for use should be verifiedas to the suitability and compliance with actual requirements,specifications and any applicable laws and regulations. For otherapplications or conditions of use, Kingspan Insulation offers a freeTechnical Advisory Service (see left) whose advice should be soughtfor uses of Kingspan Insulation products that are not specificallydescribed herein. Please check that your copy of the literature iscurrent by contacting our Marketing Department (see above).

UK: – Telephone: +44 (0) 870 850 8555– Fax: +44 (0) 1544 387 278– email: [email protected]

Ireland: – Telephone: +353 (0) 42 97 95032– Fax: +353 (0) 42 97 46129– email: [email protected]


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