standing seam - vmzinc.com.tr€¦ · 2 roofing contents company profile vmzinc ... standing seam...

Standing seamNon-ventilated and ventilated roof systems

Guidelines for design and specification

ROOFING

Uniclass

CI/SfB(47)

G312:G24:P45

January 2014Mh7

2 Roofing

Contents

Company profile VMZINC® manufactures a wide range ofrolled zinc products for use in constructionand has almost two centuries ofexperience. In addition to the standingseam system, products include rainwatersystems, cladding systems and decorativeroofing products such as dormers, bull’seyes, weather vanes, finials andbalustrades. VMZINC is part of the UmicoreGroup which has worldwide interests inprecious metal services, recycling of non-ferrous metals, and catalyst technologies for the automotive industry. It also manufactures substrates forphotovoltaics and LEDs, materials forphotonics and lenses, and opticalassemblies for night vision applications.

Standing seam

3 ......... Why use the VMZINC standing seam system?

4 ......... Sustainable performance

6 ......... The systemUnderlying principles

8 ......... Surface finishes

12 ........ Warm roofs (non-ventilated)Introduction

14. Standing seam on rigid insulation – Structural Roof 16. Standing seam on cellular glass insulation – Compact Roof

(Only solution for high humidity buildings such as swimming pools)

18. Standing seam on insulated metal-faced panels20. Standing seam on plywood bonded to phenolic foam

24 ....... Cold roofs (ventilated)Introduction

26. Standing seam on vented plywood28. Standing seam on open-gap timber boarding

32 ....... Technical drawings

36 ....... Further technical information

37 ....... Standing seam facades

38 ....... Heritage – batten cap roofing

39 ....... Other VMZINC systemsRainwater systemsRainscreen facades

Front cover building credit: MBM Arquitecto

3Roofing

Why use the VMZINC standing seam system?

Standing seam

Zinc is among the most sustainable metalsused in construction today and has beenused on the roofs of Paris for almost 200years. The VMZINC standing seam system isalso highly cost-effective, both from an initialprocurement and design life perspective.

Whether for new build or refurbishment, theVMZINC standing seam system has beendesigned to complement a wide range ofbuilding materials and styles. The finishesavailable offer exceptional colour stability.This ensures that maintenance requirementswill be minimal throughout the system’sdesign life and that the material’s installedappearance will be retained for many years.

VMZINC’s versatile standing seam system canbe used for warm or cold roof constructions.Some of its many benefits are listed below.

� Lightweight and durable

� Minimal expansion and creak

� Fully recyclable

� A design life of 80 years

� Virtually maintenance-free

� Can be installed on pitches from 3°-90°

� Complex shapes can be easily achieved.Zinc panels can be pre-curved to aradius as low as 600mm

� Can be used to cover soffits (box gutteroverhangs, etc)

� BRE Green Guide certified

� BBA certified

� Conforms to EN 988

� Can be laid in lengths up to 13 metreswithout the need for expansion steps

� Fire performance rating ‘AA’ - BS 476: Part 3(‘low vulnerability’ class in Scotland)

� Available in a choice of either naturalfinish or 6 pre-weathered finishes

Introduction

Benefits of the VMZINC

standing seam

system

Sustainable performance

4 Roofing

Standing seam

Low energy used in the

manufacturingprocess

VMZINC rolled zinc products are used inconstruction industries throughout the worldfor their sustainability, distinctiveappearance, and low maintenance requirements. As with VMZINC façade andrainwater systems, manufacturing processesfor our standing seam system presents a lowenvironmental impact, particularly withregard to energy expenditure.

As the comparative energy expenditurediagram opposite shows, less energy isrequired to extract zinc from the groundthan the other principal metals, and iseven more favourable for recycled zinc.Such minimal use of energy in theproduction of zinc clearly indicates itscontribution to sustainable development.

95% of old rolled zinc recovered every yearin Western Europe, currently estimated at100,000 tonnes, is reused. This representssavings in mining resources of between 1 and 2 million tonnes.

The VMZINC standing seam system benefitsfrom zinc’s self-protecting patina whichdevelops as a result of exposure to waterand carbon dioxide. Over the last 50 yearsthe quantity of sulphur dioxide in theatmosphere has been greatly reduced. SO2being the key agent of corrosion meansthat corrosion rates are now 1μm per year.With an initial thickness of 0.7mm, theestimated life span of rolled zinc is over ahundred years.

VMZINC undertakes Life Cycle Analysis (LCA)tests on its products and publishes Environmental Product Declarations (EPDs),such as BRE Environmental Profiles, availablefrom our website www.vmzinc.co.uk andwww.greenbooklive.com. These provideusers with comprehensive, reliable andtransparent information on relevant environmental characteristics. Theinformation is also used by VMZINC as thebasis for its eco-design approach.

Low corrosion,long life

Recycledmaterial

Comparative energy expenditure in manufacture

Compared with other metals, very little energy is needed to manufacture zinc metal from ore –less than half the consumption of copper and stainless steel and less than a quarter of that used foraluminium. CO2 and other greenhouse gas emissions are also, therefore, proportionally less.

A naturalmaterial

Sustainable performance

5Roofing

Standing seam

Environmental profiles measure theimpacts of a construction material, productor building system throughout its life, notonly during its manufacture, but also itsuse in a building over an 80 year period.This includes its extraction, processing, useand maintenance and its eventual disposal.

VMZINC has been audited and reviewed byBRE Global. The Life Cycle Assessment (LCA)modelling derives a Certified EnvironmentalProfile and a Green Guide rating has beenproduced.

A wide range of zinc roofing and claddingsystems has been audited with thesystems receiving a Green Guide rating ofup to A+. These profiles can then beapplied to the BREEAM (BRE EnvironmentalAssessment Method) allowing VMZINC tocontribute to schemes such as the Code forSustainable Homes.

Since 2009, VMZINC has been OHSAS 18001certified, thus conforming to occupationalhealth and safety management systems.

VMZINC manufacturing plants haveconformed to ISO 14001 since 2004/5 soprocesses are strictly controlled to ensurethat emissions are significantly below thenational regulation threshold.

ISO 9001 is the internationally recognisedstandard for the quality management ofbusinesses and applies to allUmicore/VMZINC products and services.Certification was originally obtained in 1997and updated in November 2003 to conformto ISO 9001: 2000.

ISO 14001

ISO 9001

OHSAS 18001

BRE

The systemUnderlying principles

6 Roofing

Standing seam

The standing seam system consists of a comprehensive range of robust componentsthat ensures appropriate and correct installation is achieved. It is also importantthat standing seam roofs are installed byproperly trained and equipped professionals.

Individual panels are held in place at the topof the pitch by a minimum of 5 fixed clipsand then towards the lower portion of thepanel by sliding clips allowing thermalmovement. These stainless steel clips, whichare fixed to the structure, are crimped insidethe joints. Thus the fixing clips for panels andflashings never penetrate the material andtherefore do not affect the appearance ordamage the waterproofing. The low height ofthe seams (25mm standard) and the 600mmmaximum spacing between joints give theroof a light, harmonious appearance.

The standing seam system is available invarious standard coil dimensions shown inthe table on the opposite page. Non-standardwidths between 60mm and 600mm can alsobe produced.

The standing seam panels weigh approx 6kg per m2.

See pages 8 and 9 for samples of the 7finishes available.

The system is emminently suitable for warmroof constructions (pages 12-21) and for coldroof constructions (pages 24-29).

VMZINC PLUS is a unique patented productthat allows zinc to be installed on ventilatedplywood (page 26) as well as specific warm(non-ventilated) substrates (pages 12-21).The product consists of VMZINC (in allfinishes) having a 60µm coating applied tothe underside thus allowing a more variedamount of substrates to be used andeliminating the risk of the formation ofwhite rust on the underside of the zincstanding seam panels. VMZINC PLUS resiststo an abrasion of 40 litres when tested inaccordance with ASTM D 968.

Introduction

Before crimping

Panel dimensions (mm)

After crimping (double lock standing seam)

4

129

430, 530, 600

8

25 26

B A

B A

VMZINC PLUS

Panel B

Panel AClip

Installation sequence

1. Position panel A2. Engage clips to upstand of panel A and screw fix to substrate3. Engage edge of panel B over clip4. Crimp all 3 components together to form double lock standing seam

The systemUnderlying principles

7Roofing

Standing seam

VMZINC has 2 BBA Certificates for non-ventilated warm roof systems –the Structural Roof and the Compact Roof. See pages 14 to 17.

BBA certified systems give a wide range of benefits. For over 40years agrément certificates have been supplied by the BBA inorder to give unbiased information on the performance of asystem. By selecting a BBA system an architect is sure to avoidproblems at a number of stages in the building process andqueries about the performance of key products. By using BBAcertified systems contractors also know that they will perform, ifinstalled in accordance with the guidance in the Certificate.

VMZINC supply a number of accessories ranging from a breathermembrane (page 36) to fixing clips (page 36) and flashings suchas the G3 ridge, eave and verge.

CERTIFICATE No 12/4900

BBA

Surface finish Coil thickness (mm) Coil width (mm) Standing seam centres (mm)Natural zinc 0.70 or 0.80 500, 600 or 670 430, 530 or 600

QUARTZ-ZINC 0.70 or 0.80 500, 600 or 670 430, 530 or 600

ANTHRA-ZINC 0.70 or 0.80 500, 600 or 670 430, 530 or 600

PIGMENTO 0.70 or 0.80 500, 600 or 670 430, 530 or 600

Standing seamcoil dimensions

VMZINCaccessories

Standing seam zinc roofing will not give a perfectly flat finish.However, by reducing panel width and increasing zinc thickness,unevenness will be reduced.

Please contact us for further

design assistance

8 Roofing

Surface finishes

Standing seam

Natural VMZINC®

QUARTZ-ZINC®

ANTHRA-ZINC®

Natural VMZINC hasa shiny metallicappearance whennew and develops apatina over time.Thus in its first 5years it graduallytakes on a uniformmatt light greyappearance. It canbe quickly solderedwithout removingthe patina.

QUARTZ-ZINC offers anappearance andtexture that does notchange over time.When QUARTZ-ZINC isscratched, it will selfheal. The grey tonesof QUARTZ-ZINC blendwell with existingconstructionmaterials – ideal forrefurbishment.

ANTHRA-ZINC with itsvisible grain matchesthe colour of slateand blends well incombination withphotovoltaic panels.

9

Surface finishes

Standing seam

PIGMENTO finishesoffer a unique rangeof colours thatenhances anybuilding. This naturalproduct enables thetexture of theQUARTZ-ZINC to stillbe seen whilstoffering the designerthe choice of colourto complement otherelements of abuilding’s facade or roof.

The colouration ofthe zinc is achievedwith a specialpigment layer thatenhances thequalities of the zincwithout presenting ablock colour. Thisproduct will agegracefully andrequires minimummaintenance.

PIGMENTO provides aspecial resilience in amarine environmentand makes theremoval of saltdeposits easier thanon the regularsurfaces of other zincfinishes.

PIGMENTO isavailable in fourstandard colours:PIGMENTO Blue, Red,Green and Brown.

PIGMENTO®

PIGMENTO® RED

PIGMENTO® BLUE

Roofing

PIGMENTO® GREEN

PIGMENTO® BROWN

Please contact us for

samples

10 Roofing

Standing seamFigura

11Roofing

Standing seamDesign Engine

Jacobs Engineering

Standing seam

Warm roofs (non-ventilated)Introduction

12 Roofing

The VMZINC G3 Ridge:

� Gives a sleek, aesthetic value to the roof

� Is a standard VMZINC solution

� Is easy to install

For more information contact us on01992 822288

or send an e-mail [email protected]

Typical detailusing the

VMZINC G3 Ridge on

a warm non-vented

build-up

Fixing clip

G3 Ridge

Advantages of a warm

non-vented roof

This type of construction reduces thermalbridges and increases air tightness whilststill offering BBA certification and a BREGreen Guide rating.

Warm non-vented roofs

VMZINC PLUS VMZINC PLUS must be used in all types ofwarm non-vented roof construction.

VMZINC PLUS is a unique solution that offersa protective coating 60 microns thick on itsunderside to protect the zinc from possiblecorrosion. VMZINC PLUS also allows all 7available finishes to be installed.

Warm roofs (non-ventilated)

Standing seam

Introduction

13Roofing

Warm non-ventilated and cold ventilated roofs are two termswhich do not always denote the same ideas to all building professionals. In order to put the warm non-ventilated roofsystem into context, we will refer to it as a roof where there isabsolutely no vented space within the roof build-up andfurthermore the entire roof structure is on the warm side of theinsulation. In the UK this means that the roof structure is entirelybelow the insulation.

� VMZINC PLUS must be used on all warm roof build-ups

� VMZINC Membrane must be used (breather membrane)

� The substrate must be continuous and even and the correctfixing clips must be used

� A fully supported continuous vapour barrier must be installed(bitumen-backed aluminium foil). Polythene films are notacceptable

Definition ofwarm roof in the UK

Elements of the

system

Typical warm roof

arrangement

With rigid insulation – Structural Roof ..................................... p14

With cellular glass insulation – Compact Roof ......................... p16

With insulated metal-faced panels ............................................ p18

With plywood bonded to phenolic foam ..................................... p20

Warm roofstanding

seamconstructions


Continuous layer of insulation covering a fully supported vapour barrier.

Standing seam

Standing seam on rigid insulation – Structural Roof

14 Roofing

� BBA certified – 12/4900 product sheet 1

� BRE Green Guide rated A+

� Reduced thermal bridges

Advantages of the

Structural Roof

1

2

3

4

Interior finish

Support structure (e.g. steel deck or plywood)

Continuous, fully supported vapour barrier

Insulation (e.g. mineral board or PIR)

VMZINC Membrane

VMZINC PLUS Standing Seam

Key to construction

build-up

1

2

3

4

5

6

5

6

Example of bituminous vapour barrier with aluminium foil



Standing seam on rigid insulation – Structural Roof

Standing seam

15Roofing

Download the technical drawings of this roof build-up from our website

www.vmzinc.co.uk

Note:The information relating to the installation of insulation andmembranes is indicative only.

The choice and installation of these products will be according to therecommendations of the insulation and membrane manufacturers.

With this warm roof system VMZINC PLUS Standing Seam can beinstalled on rigid insulation (mineral board or PIR) withoutventilating the underside of the zinc. It is fixed through to thedeck with special fixing screws and clips supplied by VMZINC. Thesystem can be used for roofs with a pitch from 3º to 60º and forbuildings with humidity classes of between 1 to 4 (dwellings withhigh occupancy, sport halls, etc).

The supporting structure can be a steel or plywood deck. Eitherdeck is covered by an aluminium foil-reinforced bituminous vapourbarrier with a high water vapour resistance (minimum vapourresistance 4000MNsg) installed with cold or hot glued joints. Higherperformance vapour barriers may be required depending on thehumidity class of the building. All insulation materials must have acompression strength of minimum 50kPa (0.5kg/cm2), at amaximum 10% deformation and must be dimensionally stable atup to 100°C and comply with current Building Regulations. Betweenthe VMZINC PLUS and the insulation, a VMZINC Membrane is fixedwith an overlap that varies depending on the slope. The insulationmaterial must also comply with the fire resistance requirements ofthe Building Regulations.

The Structural Roof includes a fixing system that allows both fixed andsliding clips to be installed without damaging the insulation but at thesame time allowing the zinc panels to freely expand and contract.

Area ofapplication

Structure

Sliding clip

Distributionplate

Spacer

Fixed clip

Screw type to suit structure

Clip types and associated

components


Standing seam on cellular glassinsulation – Compact Roof

Standing seam

16 Roofing

1

2

3

4

Interior finish

Steel deck or plywood deck

Cellular glass insulation (e.g. FOAMGLAS)

Galvanised steel plates

Bituminous membrane

Polyethylene separation layer


Key to construction

build-up

5

6

1

2

3

4 5

6

7

7

� Ideal for buildings with high humidity levels (including class 5, swimming pools)

� BBA certified – 12/4900 sheet 2

� Almost no thermal bridges

� Excellent pull-out resistance

Advantages of the

Compact Roof


Galvanised steel plates inserted intoFOAMGLAS insulation


Standing seam on cellular glassinsulation – Compact Roof

Standing seam

17Roofing


www.vmzinc.co.uk



Area ofapplication

Structure

Suitable for use on roofs with pitches from 3° to 60°. The onlysolution for high humidity buildings (eg swimming pools), thissystem can be installed on plywood and steel decks to themanufacturer’s specifications.

FOAMGLAS cellular glass insulation offers resistance in any type ofhumid situations. Tapered or uniform thickness cellular glassinsulation is available in board or slab format. Double layering ispossible. For further information on cellular glass insulation,please contact FOAMGLAS.

FOAMGLAS cellular glass insulation is adhered to the substrateusing a cold adhesive; the staggered joints of the board areclosely butted with the cold adhesive ensuring a vapour tight seal(no vapour barrier is required).

� The upper face of the cellular glass board has a bitumen andpolyethylene protective layer.

� Galvanised steel plates are applied to the upper slab or boardsurface of the FOAMGLAS. Its bitumen upper surface is heatedwith a gas torch and the plates are inserted within the cellularglass insulation, forming a secure ‘non thermal bridge’ bond.The galvanised steel plates must be positioned in collaborationwith the VMZINC installer.

� A high performance bituminous membrane +3mm thick with asanded finish is torch applied to the upper surface of theinsulation with lapped joints, the flow of bitumen ensures thebutted joints are sealed. This membrane covers the entire roofsurface including the plates.

� Polyethylene film is installed to avoid any contact between theVMZINC PLUS and the sanded torch-on bituminous membrane.

� The VMZINC PLUS panels are fixed to this structure with VMZINCclips screwed into the galvanised steel plates.


18 Roofing

Standing seam on insulatedmetal-faced panels

Standing seam

� BRE Green Guide rated A

� This solution provides good pull-out resistance

� Offers a fast track installation process over large areas

� Reduced thermal bridges

� Allows building to dry out rapidly

Advantages ofstanding seam

on insulatedmetal-faced

panels

1 2 3

4

1

2

3

4

Insulated metal-faced panel (0.7mm steel thickness)

Aluminium-faced tape

VMZINC Membrane


Key to construction

build-up


19

Standing seam on insulatedmetal-faced panels

Standing seam

Roofing

Note:The information relating to the installation of panel, clips andmembranes is indicative only.

The choice and installation of these products will be according tothe recommendations of the panel manufacturer.


www.vmzinc.co.uk

Suitable for buildings in 1 to 4 humidity classes (dwellings withhigh occupancy, sports halls, etc) and with pitches from 3° to 60°.For installation on metal-faced composite panels VMZINC PLUS,with its specially protected underside, must be used. The outerskin must provide a minimum pull-out value of 50kN for thestanding seam fixing clip (dynamic testing method).

The insulated metal-faced composite panel must be made fromgalvanised steel on both the internal and external facing(minimum thickness 0.7mm for external facing). Fixings and clipsmust not inhibit the required expansion and contraction of theVMZINC PLUS or cause any damage to the protective coatingunderneath.

The insulated metal-faced composite panel must provide a 100%vapour barrier. This is normally achieved using a panel with avapour tight interlocking jointing system. It is the specifiersresponsibility to ensure there is no risk of condensation in thistype of roof construction and the use and humidity of the buildingshould be considered before specifying this solution.

The warm side of the insulated panel joint must be sealedtogether with the top side. All joints and penetrations should besealed appropriately.

The surface of the support that the zinc is to be laid on, must beeven to within 2mm.

Area ofapplication

Structure


It is important that all screws and clips used on an insulated metalpanel must be flush to the surface of the panel within 2mm. Forinstances where this is not the case it is possible to use clips with araised section that allows free thermal expansion and contractionof the zinc panel without any risk to the underside of the zinc.

Clipsand

screws

Standing seam on plywoodbonded to phenolic foam

Standing seam

20 Roofing

1

2

3

4

Metal deck or plywood deck

Continuous vapour barrier

Metdeck panel (plywood bonded to phenolic insulation)

VMZINC Membrane


Key to construction

build-up

5

� Metdeck provides a continuous support to VMZINC PLUS

� Easy installation using traditional clips

� Reduces thermal bridging

� Timber substrate can resist limited foot traffic

� Minimises the number of fixings required



on plywoodbonded to

phenolic foam

1 2

34

5


Standing seam on plywoodbonded to phenolic foam

21

Standing seam

Roofing

Area ofapplication

Structure

The system can be used for roofs with a pitch from 3º to 60º and forbuildings with humidity classes of between 1 to 4 (dwellings withhigh occupancy, sport halls, etc). As with all warm (non-ventilated)roofs VMZINC PLUS must be used. This system provides a continuous18mm WBP exterior grade plywood substrate allowing greaterflexibility installing the VMZINC PLUS finish, thus eliminating theneed to penetrate the insulation layer with additional fixingsthereby minimising thermal bridging. With this warm roof systemVMZINC PLUS Standing Seam can be installed on Metdeck compositepanels without ventilating the underside of the VMZINC PLUS.

The substrate of the Metdeck composite panels (on the warm side ofthe roof panel) must be covered with a continuous aluminium foil-backed bituminous self-sealing vapour barrier to BS EN 13970: 2004.

Condensation risk must be assessed for each individual project orindividual project component in accordance with BS 5250: 2002.Specification may need to be adapted to the internal humidityload of the building. The VMZINC Membrane should be installedbetween the VMZINC PLUS and the Metdeck composite panels,then dressed into the gutter.

Metdeck composite panels, incorporating 18mm WBP plywoodfactory-bonded to a Resol insulation core, are mechanically fixed tothe substrate (vapour barrier on concrete, metal or timber deck). Thenumber of fixings required will vary with specific building details andgeographical location, and must be assessed on an individual basis.




www.vmzinc.co.uk


Product thickness* (mm) U-value (W/m2K)

98 0.23

108 0.21

118 0.19

138 0.16

148 0.15*Product thickness = insulation + 18mm WBP ply.

Table of U-values

22 Roofing

Standing seamTim

Ronalds Architects

Roofing

Standing seam

23

Tyack Architects LtdDRLW

Architect, France

Cold roofs (ventilated)Introduction

24

Standing seam

VMZINC PLUS VMZINC PLUS is a unique solution that offersa protective coating 60 microns thick on itsunderside to protect the zinc from possiblecorrosion. VMZINC PLUS allows zinc in all 7available finishes to be installed on a coldvented roof using a plywood deck (page 26).

Roofing

For more information contact us on044 1992 822288

or send an e-mail [email protected]

The VMZINC G3 Ridge, shown above:

� Gives a sleek, aesthetic value to the roof

� Is a standard VMZINC solution

� Is easy to install

Typical ridgedetail

Fixing clip

G3 Ridge

Advantages of a cold

vented roof

Traditional construction which has a longhistory and is covered by the Code ofPractice 143-5: 1964. This type of build up isalso used for roofs with pitches above 60ºas well as walls and soffits.

Cold vented roofs

Alternative ridge detail

25

Cold roofs (ventilated)Introduction

Standing seam

Roofing

Definition ofcold roof in the UK

Typical cold roof

arrangements

Cold ventilated roofs and warm non-ventilated roofs are two termswhich do not always denote the same ideas to all building professionals. In order to put the cold ventilated roof system intocontext, we will refer to it as a roof where there is a continuous airspace of at least 50mm between the substrate supporting the zincand the insulation. This air space must be a vented space withopenings generally at the eaves and the ridge. Linear air vents mustbe at least 10mm wide and are commonly protected by insect mesh.It is always good practice to include a vapour control layer in the buildup and this should be installed on the warm side of the insulation.

� VMZINC PLUS must be used on plywood whereas VMZINC isacceptable on open-gap softwood boards (see page 28)

� VMZINC Membrane can be used to protect the insulation

� The substrate must be continuous and even, and the correctfixing clips must be used

Elements of the

system

With plywood .............................................................................. p26

With open-gap timber boarding ................................................ p28

Cold roofstanding seam

constructions

Cold vented roofs

Air inlets and outlets are generally linear (at least 10mm wide) but can be individual (see photo).The ventilation must correspond to BS 5250: 2002.

1

2

3

4 5

6

7

8

9

Standing seam on vented plywood

26

Standing seam

Roofing

1

2

3

4

Interior finish

Vapour control layer

Insulation

VMZINC Membrane

50mm ventilated air space

Rafter

Batten

Plywood


Key to construction

build-up

5

6

7

� Provides a continuous rigid deck for the VMZINC PLUS

� Plywood decking is readily available and widely used




on ventedplywood

8

9

Cold vented roofs

27

Standing seam on vented plywood

Standing seam

Roofing


www.vmzinc.co.uk



Area ofapplication

Structure

Suitable for buildings in 1 to 4 humidity classes (dwellings withhigh occupancy, sport halls, etc) with pitches from 3° to thevertical. VMZINC is installed on the roof boarding. A 50mmcontinuous air gap must be left clear beneath the plywood.Continuous ventilation openings are made at the ridge and eaves.In order to maintain the integrity of the roof, a breathermembrane should be installed on the cold side of the insulation,and a vapour control layer appropriate to the building’s humiditylevels laid on the warm side of the insulation.

VMZINC PLUS must be used. VMZINC Membrane can be usedbetween the VMZINC PLUS and the plywood, although this isoptional but may have the advantage of protecting the plywoodprior to the installation of the zinc. The ideal thickness of theplywood is 18mm and it must be weather and boil proof. WBPplywood is more precisely described as EN314-3 (glue bond) andEN636-2 (timber performance). The substrate must be flush towithin 2mm and all screws and nails must be countersunk. The50mm air space must be continuous and vented by openings atthe base and top of the roof which are generally linear vents atleast 10mm wide protected by insect mesh and correspond to BS 5250: 2002. The VMZINC membrane can be used to protect theinsulation but the 50mm air space must not be compromised. It isalso recommended to install a vapour control layer on the warmside of the insulation.

Cold vented roofs

Standing seam on open-gaptimber boarding

28

Standing seam

Roofing

1

2

3

4

Interior finish

Vapour control layer

Insulation

VMZINC Membrane

50mm ventilated air space

Rafter

Batten

Open-gap timber boarding

VMZINC Standing Seam

Key to construction

build-up

5

6

7

� A very versatile and easy to install substrate

� Flexible because it also permits complex shapes to be clad in zinc


� Easy installation using traditional clips



on open-gaptimber

boarding

8

9

1

2

3

4 5

6

7

8

9

Cold vented roofs

29

Standing seam on open-gaptimber boarding

Standing seam

Roofing


www.vmzinc.co.uk



Area ofapplication

Structure

Suitable for buildings in 1 to 4 humidity classes (dwellings with highoccupancy, sport halls, etc) with pitches from 3° to the vertical (aswell as soffits). VMZINC is installed on the roof boarding. A 50mmcontinuous air gap must be left clear beneath the roof boarding.Continuous ventilation openings are made at the ridge and eaves. Inorder to maintain the integrity of the roof, a VMZINC breathermembrane should be installed on the cold side of the insulation, anda vapour control layer appropriate to the building’s humidity levelslaid on the warm side of the insulation.

VMZINC must be installed directly over the open-gap softwoodboarding without the use of any membrane. The boarding shouldbe clean and dry, 100mm to 150mm wide, 18mm or 24mm thick,according to the rafter centres. Any wood treatment products(fungicides, insecticides) must be dry and completely neutral inrelation to VMZINC. See page 36.

The roof boards are fixed perpendicularly to the direction of thepitch leaving a 3mm to 5mm gap between them. They are securelyfixed to the structure.

Maximum difference in height between roof boards should not bemore than 1mm. The deflection measured under a rigid 600mmlong straight edge cannot exceed 2mm in any direction. The roofboard nails are countersunk in order to avoid any contact with the VMZINC.

Metal salt solutions must not be used on the timber boarding.

Cold vented roofs

30

Standing seam

Roofing

Donald Insall Associates

31

Standing seam

Roofing

David Morley Architects

Howl Associates

32

Standing seam

Technical drawings

8010

15

15

185 18550

Roofing

Ridge detail

VMZINC PLUS StandingSeam

Insulation: mineralwool or PIR

Decompression strip G3

Vapour barrier:aluminium foil/bitumentype fully supported byplywood or metal deck

VMZINC Membrane

VMZINC Ridge Clip G3(fixed part)

VMZINC Ridge Clip G3(moving part)

VMZINC Ridge G3

Clip fixing in accordancewith the specification

1

2

34

5

6

7

8

9

5 2

3

4

1

6

7

8

9

6

7

Box gutter(inside wall)

detail

50 m

in.

80 m

in.

60

(B) Flat folded lip edging

(Upstand slope 1°)

(Upstand slope 1°)

(A) Rolled bead edging

Alternative upstand detail


VMZINC PLUS continuouseaves apron strip

VMZINC PLUS sheet clip,0.7mm thick, width80mm, 2 per m

VMZINC PLUScontinuous folded strip,0.7mm thick

VMZINC PLUScontinuous apron strip,0.7mm thick

Timber blocking, 5mmthinner than theinsulation

Roof boarding

VMZINC PLUS boxedgutter

VMZINC PLUScontinuous sheet strip,0.7mm thick

Roofing membrane inaccordance with the specification

PE film

Cellular glass insulation

Wall

1

2

3

4

5

6

7

8

9

10

1112

1

2

3

4

5

6

78

9

10

11

127

12

3

The box gutter detailuses

Standing Seam oncellular glass

insulation –Compact Roof

construction (p16)

The ridge detailuses

Standing Seam onrigid insulation –

Structural Roofconstruction

(p14)

13

13

2

All dimensions in mm

Download the complete set of

technical drawings from our website

www.vmzinc.co.uk


33

Technical drawings

Standing seam

Roofing

Verge detail

Box gutter(outside wall)

detail


Insulated metal-facedpanel in accordance withthe specification

VMZ stainless steelsliding clip, bent toshape as required

VMZINC PLUS fascia

VMZINC PLUS continuousedge flashing

Wall

VMZINC Membrane

1

2

3

45

6

7

The verge detailuses

Standing Seam oninsulated

metal-faced panels

construction (p18)

The box gutter detailuses

Standing Seam onplywood bonded to

phenolic foamconstruction

(p20)


VMZINC PLUS continuouseaves apron strip


VMZINC PLUS continuousfolded strip, 0.7mm thick

VMZINC bracket, 1mmthick, width 250mm, 2 per m

Timber blocking, 5mmthinner than Metdeck

Roof boarding (underbox gutter on packerslaid to fall)

VMZINC PLUS boxedgutter

VMZINC fascia with400mm x 2000mmwelted panels

VMZINC Membrane

Vapour barrier:aluminium foil/bitumentype fully supported onplywood or metal deck

Metdeck panel(plywood bonded toResol phenolic foam)

VMZINC Uniprofil F4

Mesh (2mm maximumweave)

Wall

1

2

3

4

5

6

7

8

9

10

11

12

13

14

50 m

in.

80 m

in.

60

(Upstand slope 1°)

(Upstand slope 1°)

Ventilated space

Ventilated space

Packers laid to fall

(B) Flat lip edging

(A) Rolled bead edging

Alternative upstand detail

1

2

3

5

6

78

9

10

11

12

14

9

3

20 min.

1

2

3

4

5

6

7

15

15

2

4

2

13




www.vmzinc.co.uk


34 Roofing

Standing seam

Technical drawings60

Mansarddetail

The mansard detailuses

Standing Seam onopen-gap timber

boardingconstruction

(p28)

Rooflightdetail

The rooflight detailuses

Standing Seam onvented plywood

construction (p26)


VMZINC continuouseaves apron strip

VMZINC sheet clip,0.8mm thick, width80mm, 2 per m

VMZINC folded clip,1mm thick, width250mm, 2 per m

Eaves board, 5mmthinner than adjacentboards

Roof boarding


VMZINC Membrane

Ventilated space

1

2

3

4

5

6

7

8


VMZINC head saddlepiece

Breather membrane

Rooflight flashing

Plywood


VMZINC double welt,continuously soldered

VMZINC Standing Seam,folded, laid flat andsoldered with space atfillet allowing expansion

Fillet, 0.5º minimumslope

Ventilated space

1

2

3

4

5

6

7

8

9

A A B B

C

C

300

Plan view Section CC

RooflightStanding Seam

Flat laid seam soldered continuously

Section BB

Section AA

Saddle piece

250 min.

300

80

250 min.

Penetrations must not interrupt more than three seams

1

3

4

5

6

7

8

1

6

1

2

3

4

5

6

7

8

9

1

6

4

5

5

5

1

4

2

9

9

9

10

10

10

10




www.vmzinc.co.uk

Cold vented roofs

35Roofing

Standing seam


Roof boarding

Sprocket piece


Ventilated space

VMZINC saddle piece

VMZINC sheet clip,0.8mm thick, width80mm, 2 per m

VMZINC folded clip, 2 per m

VMZ ridge piece

VMZINC Membrane

1

2

3

4

5

6

7

8

910

Ventilated ridgedetail

The ventilated ridge detailuses

Standing Seam on open-gap timber

boardingconstruction

(p28)

Box valley gutterdetail

The box valley gutter detailuses

Standing Seam on vented plywood

construction (p26)


VMZINC PLUScontinuous eaves apronstrip


VMZINC PLUScontinuous folded strip0.7mm thick

Breather membrane inaccordance with thespecification

Plywood eaves strip,5mm thinner thanadjacent plywood

Plywood

VMZINC PLUS gutterlining

Ventilated space

Packers laid to gutterfall


Heating cables (ifrequired)

Overflow at stop end(s)of gutter

1

2

3

4

5

6

7

8

9

10

80

5530

50

170

1 2

3

4

5

6

79

8

10

8

200 min.

30

60

200

10

11

12

13

1

25

6

7

8

9

10

11

12

13 3

4

99

5

9


Technical drawings Download the complete set of


www.vmzinc.co.uk

Cold vented roofs

Further technical information

36

Standing seam

Roofing

Compatible contact products

Metals

Lead

Aluminium (painted, anodised or bare)

Galvanised steel

Stainless steel

Woods

Pine

Spruce

Scots pine

Poplar

Miscellaneous materials

Polyurethane

Non-acetic silicones

MS polymer mastics

Organic timber treatments

Incompatible contact products & run-off*Metals

Copper

Steel (non-galvanised)

Gypsum dust/limestone dust

Woods

Larch

Oak

Chestnut

Red cedar

Douglas fir

White cedar

All woods with a pH < 5

Miscellaneous materials

Mortar

Building paper

Bituminous membranes

Fire retardant & preservative treatments

Acidic cleaners (brick cleaner etc)

Acetic silicones

Metal salt timber treatments

VMZINCMembrane

* This list is not exhaustive

Zinc aesthetics It is generally not recommended that zinc roofs and walls are cleanedas rain water performs this task very well. Non-rinsed surfaces suchas soffits and some facades, especially in coastal areas may exhibitsome stains. It should be noted that this is not a form of corrosion.

Zinc can be installed adjacent to limestone. The run off fromlimestone onto zinc material is acceptable. However, limestone dustand gypsum dust generated during cutting operations can react withzinc in the presence of water and form a superficial layer of whiterust. No dust should be in contact with unprotected zinc. To preventwhite rust, good construction practices should be used to limit theamount of dust that comes in contact with the zinc.

VMZINC manufacturing uses a colour management system basedon the Y-Factor. The Y-factor ranges from 0 to 100: 0 is black and100 is white. The range for ANTHRA-ZINC is 5 to 7 and the rangefor QUARTZ-ZINC is 22 to 25. We recommend that one project usesone production batch.

Clips have a dual function: � Ensuring the mechanical resistance of the entire roof� Allowing free expansion of the metal

VMZINC clips are made of 304 stainless steel. The thickness of thefixing clip is 0.5mm. The sliding clips have a moving component,which is 0.4mm thick, and a 70mm long slot to allow free movementof the panel when it is under expansion and contraction. Each clipmust resist a pull-out force of 50daN. It is recommended that screwsbe used to secure the clips with three being used per sliding clip. The use of nails offers significantly less resistance, but in the event ofusing nails, contractors are advised to use ring shank nails.

Centre to centre distance between clips: � 330mm on the main part of the roof � 200mm on perimeter of the roof (at least

1100mm or 1/8 of the projected roof) � 150mm in the corners

All standing seam panels require a minimum of 5 fixed clips. Whenattaching PV panels, snow guards, etc it may be necessary to furtherincrease the number of these clips. Standard panel width is 600mm,however for aesthetic or wind up lift reasons 530mm or even 430mmwide panels can be used. Please consult us for further information.

VMZINC Membrane is a breather layer that allows water vapour topass through it but is water proof to liquid water (up to a columnof 2m). For roof pitches above 22º (40%) the membrane should beoverlapped by 150mm. Below this slope the overlap should beincreased to 200mm. For pitches between 3º (5%) and 14º (25%)the overlap should be 200mm and taped.

Fixing systemmethod

VMZINC in relation to other materials

Sliding clip

Fixed clip

37

Standing seam facades

Standing seam

Roofing

FACADE

VMZINC can be used as a standing seam panel for all vertical wallsas well as soffits. The structure must be a cold ventilated oneusing either VMZINC on vented open gap boarding or VMZINC PLUSon vented plywood (humidity classes 1 to 4). The vented air spacemust be at least 38mm wide. The panels can be installedvertically, horizontally or even diagonally but panel length shouldnot exceed 4m. Although zinc standing seam panels are not asflat as some other VMZINC façade systems it is possible to reduceunevenness by reducing panel width to 430mm and zinc thicknessto 0.8mm. The use of a single lock also increases panel flatness.

Standing seampanels as walls

and soffits

Single lock standing seam

Integrated Design Consultants

38

Standing seam

Heritage – batten cap roofing

Roofing

VMZINC has been used as a material for heritage projects foralmost two hundred years. VMZINC produces ornaments such asfinials, weathervanes and bull’s eye windows. These elementsexist in both standard shapes and sizes as well as completelybespoke products. The batten cap roofing system is often a moreappropriate choice for traditional buildings.

Longevity andversatility

ROOFING ORNAMENTS

39

Other VMZINC systems

Standing seam

FACADE

RAINWATER SYSTEMS

Roofing

Rainwatersystems

Rainscreenfacades

Whether for new build or refurbishment,VMZINC rainwater systems have beendesigned to complement a wide range ofbuilding materials and styles. Pre-weathered finishes offer exceptionalcolour stability while developing thenatural, self-protecting patina for whichzinc is renowned. This ensures thatmaintenance requirements will be minimalthroughout the systems’ design life andthat the material’s installed appearancewill be retained for many years.

VMZINC can be installed using the principleof a rainscreen façade. There are a numberof panel types and sizes available. Theseinclude Interlocking Panels which can beinstalled horizontally or vertically in allfinishes. Alternatively for very large panelsVMZ Composite is an excellent solution.Combining the qualities, elegance anddurability of VMZINC with the rigidity andsmoothness of composite technology, VMZComposite offers unique architecturalpossibilities for facades.

Sine Wave Panels offer an alternativedesign in zinc as do Overlapping Panelswhilst remaining cost effective solutionsfor rainscreen cladding. Flat Lock Panelscan be used on a façade in many formats,sizes and in all finishes of VMZINC.

Interlocking Panels

VMZ Composite

SubjectThe subject of this document is intended for specifiers (building project architectsand design teams) and users (companies responsible for installation on the building site) of the designated product or system. Its purpose is to provide themain information, text and diagrams, relating to specification and installation. Anyuse or specification outside the area of use and/or specifications contained in thisbrochure requires specific consultation with the Umicore technical departments.This does not commit the latter to any responsibility with regard to the feasibilityof the design or implementation of these projects.

Countries of applicationThis document applies exclusively to the specification and installation of the designated products or systems on building sites in the United Kingdom and the Republic of Ireland.

Qualifications and reference documentsPlease note that the specification of all construction systems for a given buildingremains the exclusive responsibility of its design team, who must, in particular,ensure that the specified products are suitable for the purpose of the building andcompatible with the other products and techniques used. Please note that thecorrect use of this manual requires knowledge of VMZINC materials and of thezinc roofing profession. While construction is underway all standards in force mustbe respected. A video showing the installation process is available via downloadfrom www.vmzinc.co.uk or www.vmzinc.ie. Furthermore, Umicore offers trainingcourses specifically for professionals.

ResponsibilityThe specification and installation of VMZINC products manufactured by Umicoreare the sole responsibility of the architects and building professionals who mustensure these products are used in a way suited to the end purpose of the construction and that they are compatible with other products and techniquesused. The specification and installation of the products implies respecting thestandards in force and the manufacturer’s recommendations. In this regard, Umicore publishes and regularly updates specification and installation manuals forspecific geographic areas and provides training courses. All the information on thelatter can be obtained from the local VMZINC team. Unless otherwise agreed inwriting, Umicore cannot be held responsible for any damages resulting from a specification or installation that does not respect all of Umicore’s specificationsand the above standards and practices.

Umicore Marketing Services UKFour Rivers House,Fentiman Walk,Hertford, Herts, SG14 1DB

Tel 01992 822288Fax 01992 584460Web www.vmzinc.co.ukWeb www.vmzinc.ie

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