VM ZINC : standing seam Guidelines for specification and installation Junglim Architecture - QUARTZ-ZINC Roofing and cladding system in VM ZINC Roofs from a 3 pitch and facades Freedom with shape and appearance A choice of ventilated or warm roofing systems This document applies exclusively to the specification and installation of the designated products or systems on building sites in United Kingdom and the Republic of Ireland. A Umicore brand
Standing Seam - Contents 3... 4... 5... 6 and 7... VM ZINC natural and recyclable Surface appearances What is standing seam? Types and areas of applications 8... 10... 11 to 17... 18... 20... 21 to 27... 28... 30... 31 to 37... 38... 40... 41 to 47... 48... 50... 51 to 57... 58... 59... 60 to 62... 63 to 65... 66... 67... 68... 69... 69... 70... 71... 72 to 73... Standing seam roofing, warm roof on mineral wool or PIR Fixing clips Examples of details: junction gutter, box gutter, verges, ridge/hip, valley detail, mansard, junction skylight and junction with chimmey Standing seam roofing, warm roof on composite panels Fixing clips Examples of details: junction gutter, box gutter, verges, ridge/hip, valley detail, mansard, junction skylight and junction with chimmey Standing seam roofing, warm roof on cellular glass Fixing clips Examples of details: junction gutter, box gutter, verges, ridge/hip, valley detail, mansard, junction skylight and junction with chimmey Standing seam roofing, ventilated roof on incompatible support Fixing clips Examples of details: junction gutter, box gutter, verges, ventilated ridge/hip, valley detail, mansard, junction skylight and junction with chimmey Standing seam roofing, ventilated roof on roof boarding Fixing clips Examples of details: junction gutter, box gutter, verges, ventilated ridge/hip, valley detail, mansard, junction skylight and junction with chimmey Standing seam roofing, example very low pitch Standing seam roofing, specific applications Standing seam facade, ventilated cladding, horizontal panels installed on boarding Standing seam facade, ventilated cladding, vertical panels installed on boarding Standing seam - System installation Expansion of VM ZINC - layout Measuring for and ordering profiled panels - maximum length of panels Transportation, storage, installing and working VM ZINC Preparation and fixing of the top of the panels 3 stage installation of the panels 1. Laying the panel on the structure 2. Installation of clips 3. Preparation of the panels for crimping Crimping 74... 75... Standing seam facade - Installation of the system Removing the protective film and moving around on the VM ZINC 76... 77... 78... 79... 80 to 81... Appendix 1 - Junctions at the foot of the pitch Appendix 2 - Verge flashing Appendix 3 and 4 - Flashings and forbidden contacts Appendix 5 - Ventilation of VM ZINC roofing and cladding Appendix 6 - Compatibility of VM ZINC with wood, wood derivates, glues and mastics 2
VM ZINC - natural and recyclable VM ZINC is the brand name of rolled zinc products, transformed, produced and sold by Umicore. conforms to the EN 988. is a 99.995% electrolytic zinc, to which very small quantities of copper and titanium are added. Physical properties of VM ZINC Density: 7.18+ 0.02 g/cm 3. Linear expansion: 0.022 mm per m and per C in the direction of rolling. Recyclable Zinc is 100% recyclable. More than 90% of the zinc used in the building industry is recycled. Less energy is required to produce it than the other principal metals. The energy balance is even more favourable in recycled zinc. This excellent result clearly proves the contribution of VM ZINC to sustainable developement. MJ/kg 250 203 (3) 200 105 (3) 150 100 50 50 (1) 12 (2) 43 18 0 ZINC COPPER ALUMINIUM From ore to metal From recycled material to metal 3
VM ZINC surface appearances VM ZINC : a wide variety of surface appearances Natural VM ZINC has a shiny metallic appearance when new and develops a patina naturally over time. Thus it gradually takes on a uniform matt grey appearance. QUARTZ-ZINC offers an appearance and texture close to the patina developed by natural VM ZINC. The grey tones of QUARTZ-ZINC and its structural flexibility bring out the character of a building from the outset. Appreciated for refurbishment, its natural-looking colour blends well with existing construction materials. ANTHRA-ZINC Its name reflects the charcoal colour, offering many combination possibilities. ANTHRA-ZINC is covered on both sides with a surface treatment with anticorrosion agents. ANTHRA-ZINC lends itself to highly structured architecture. PIGMENTO The PIGMENTO range is based on QUARTZ- ZINC to which mineral pigments are added. 3 colours are available: PIGMENTO blue, red and green. This coloured finish preserves the naturally grained texture of pre-weathered zinc. The coating and pigments do not in any way alter the environmental properties of pre-weathered VM ZINC. Moreover, the coating does not contain chromate development. Bilacquered VM ZINC 6 colours are available: stone white, sky blue, copper green, autumn brown, slate grey and Macao brown. For non standard colours, please contact us. ANTHRA-ZINC PIGMENTO green PIGMENTO red PIGMENTO blue QUARTZ-ZINC 4
Introduction What is standing seam? > Arch. G. Wastiau- QUARTZ-ZINC & bilacquered VM ZINC The standing seam system, which developed from roll cap: is a roof and facade covering system can be installed from a 3 pitch. can be laid in lengths upto 13 m without the need for expansion steps. can be used for ventilated or warm roofing. adapts to the simplest or the most complex roof shapes. can be used to cover soffits (box gutter overhangs, etc). Generally speaking, the profiled panels are held in place at the top of the pitch by fixed clips and on the sides by sliding clips distributed along the length of the panel. These clips, which are fixed to the structure, are crimped inside the joints. Thus the fixing clips for panels and flashings never penetrate the material and therefore do not damage the appearance or waterproofing. The low height of the seams (25 mm standard) and the 600 mm spacing between joints give the roof a light, harmonious appearance. Moreover, any non-standard width between 60 and 600 mm can be produced. Standing seam roofs or cladding should only be installed by properly trained and equipped professionals. What is VM ZINC PLUS? VM ZINC PLUS is exactly the same pure high quality material as standard VM ZINC. It, has a 60 micron thick organic coating to its underside VM ZINC PLUS is the future of Zinc in Architecture. This allows it to be installed over non ventilated & potentially non compatible substrates. Umicore organises practical training courses on the installation of VM ZINC standing seam: Reserved for roofing professionals. Organised in a covered, specially equipped training centre. : www.vmzinc.co.uk : www.vmzinc.ie ( 01992 822288. 5
Standing Seam Types of application Warm roof: VM ZINC roofing is fixed directly on the insulating material. The underside of the metal is unventilated and therefore the use of VM ZINC PLUS with an already protected underside is obligatory. VM ZINC PLUS on mineral wool or PIR Very competitive price Classes of internal humidity load: 1 to 4 VM ZINC PLUS on composite panels Very competitive price Classes of internal humidity load: 1 to 4 VM ZINC PLUS on cellular glass Non - penetrating fastening Classes of internal humidity load: 1 to 5 Ventilated roof on roof boarding: VM ZINC roof with ventilated underside. This ventilation consists of an air space where the C0 2 in the air allows the VM ZINC to develop a natural patina on the underside. This ventilated air space, with openings at the bottom and top of the roof is absolutely necessary to guarantee the durability of VM ZINC (cf appendix 5 page 79). Ventilated roof on incompatible support: In this application the underside of the metal is unventilated and therefore the use of VM ZINC PLUS with an already protected underside is obligatory. Easy installation Can be used to cover complex shapes Classes of internal humidity load: 1 to 4 Very competitive price Classes of internal humidity load: 1 to 4 6
Standing Seam Areas of application Type of standing seam roof Page Application Roof Facade Classes of Internal Humidity Load (Nb1) Low 1 Moderate 2-3 - 4 High 5 Pitch Shape Straight Curved Complex Warm roof on cellular glass Warm roof on composite panels Warm roof on mineral wool or PIR Ventilated roof on roof boarding 8 P - P P P from 3 to 45 P P Nb2 18 P - P P - from 3 to 60 P - - 28 P - P P - from 3 to 60 P P Nb2 38 P P P P - from 3 to vertical P P P Ventilated roof on incompatible support 48 P P P P - from 3 to vertical P P P > Nb1: Further details: please consult BS 5250:2002 & EN 13788:2001. > Nb2: Please consult our technical department. What is VM ZINC PLUS? VM ZINC PLUS is VM ZINC coated on the underside with a protective layer (Umicore patent). 1. Surface appearances available: Natural VM ZINC PLUS, QUARTZ-ZINC PLUS and ANTHRA-ZINC PLUS. 2. Used for «warm» applications or on incompatible structure. 3. No need to ventilate the underside of VM ZINC PLUS. 7
Standing Seam - Roofing Warm roof on mineral wool or PIR 6 5 4 3 1 2 Composition of roof 1 2 3 4 5 6 Interior finish Support structure (e.g. steel deck) Vapour control layer Insulation Breather membrane VM ZINC PLUS standing seam 8
Installation of this system see pages 66 to 79 >Arch. L3M - QUARTZ-ZINC PLUS Characteristics of this technique With this warm roof system VM ZINC PLUS standing seam can be installed on mineral wool or PIR insulation without ventilating the underside of the VM ZINC PLUS. Penetrating fixing elements can be used with the help of plates, joists or special fixing clips supplied by Umicore. Structure A choice of: Steel deck Timber deck. The insulation material has to comply with national regulation (i.e. fire resistance). Between the VM ZINC PLUS and the insulation, a breather membrane is fixed with an overlap of ± 150 mm. N.B. The information relating to the installation of insulation and membranes is simply an indication. The choice and installation of these products will be according to the recommendations of the insulation and membrane manufacturers. Area of application Roofs with a pitch from 3 to 60. Classes of internal humidity load: 1 to 4. VM ZINC, the choices Only PLUS type VM ZINC with a specially protected underside: Natural VM ZINC PLUS, QUARTZ-ZINC PLUS or ANTHRA-ZINC PLUS. 0.7 mm thick. This structure is successively covered by: A vapour control layer with a high water vapour resistance installed with cold or hot glued joints. Insulation: either mineral wool or some types of PIR. all insulation materials have to resist a compression strenght of minimum 50kPa (0.5kg/cm 2 ), at a maximum 10% deformation. Specifications: : See www.vmzinc.co.uk : See www.vmzinc.ie 9
Standing Seam - Roofing Warm roof on mineral wool or PIR Fixing clips to be used code fig. description material qty/box 1 220002860 1 sliding clip stainless steel 250 2 220002861 2 distribution plate stainless steel 250 3 205709000 3 fixed clip Stainless steel 100 4 4 spacer Fixing the clips Only with screws of a diameter, length and type appropriate to the structure. Information on the spacers (for fixed clips): In order to avoid crushing the insulation, a spacer with the same height as the insulation is placed between the breather membrane and the structure. The fixing screw goes into the hole in this spacer. 10
Examples of details The solutions presented here are simply examples and are not the only ones possible. Our technical assistance department is available to study other solutions with you. Gutter L = Flashing length - see page 76 -When rendering a wall it is recommended to protect the VM ZINC. - In some cases it is recommended to provide snow guards. 2. continuous eaves apron strip in VM ZINC PLUS 3. folded strip in VM ZINC PLUS, th = 0.7 mm, continuous 4. sheet clip in VM ZINC PLUS, th = 0.7 mm, 5. loadbearing structure 6. continuous sheet strip in VM ZINC PLUS, th = 0.7 mm 7. flashing in VM ZINC PLUS 8. PLULINE gutter bracket 9. PLULINE gutter 10. rafter, 5 mm thinner than the insulation 11. breather membrane 12. vapour control layer 13. insulation mineral wool or PIR Variation pitch min. 1 pitch min. 1 L = Flashing length - see page 76 Box gutter (gutter outside the wall) 2. continuous strip in VM ZINC, th = 0.8 mm 3. sheet clip in VM ZINC PLUS, th = 0.7 mm, 4. continuous double welt strip in VM ZINC PLUS, continuously soldered 5. bracket in VM ZINC, th = 1 mm, w = 250 mm, 2 per m 6. rafter, 5 mm thinner than the insulation 7. roof boarding 8. box gutter in VM ZINC 9. ventilated space 10. packers fixed to gutter fall 11. fascia with welted panels in VM ZINC, dimensions maximum for each panels: 400 x 2000 mm 12. breather membrane 13. vapour control layer 14. insulation mineral wool or PIR 15. continuous welt piece in VM ZINC 16. mesh (2 mm maximum weave) Variation - In some cases it is recommended to provide snow guards. - When rendering a wall it is recommended to protect the VM ZINC. 11
Standing Seam - Roofing Warm roof on mineral wool or PIR L = Flashing length - see page 76 Box gutter (gutter inside or on the wall) pitch min. 1 with flat folded clip pitch min. 1 2. continuous eaves apron strip in VM ZINC PLUS 3. sheet clip in VM ZINC PLUS, th = 0.7 mm, 4. folded clip in VM ZINC PLUS, th = 0.7 mm, continuous 5. continuous sheet strip in VM ZINC PLUS, th = 0.7 mm 6. rafter, 5 mm thinner than the insulation 7. roof boarding 8. box gutter in VM ZINC PLUS 9. bracket in VM ZINC PLUS, th = 0.7 mm, continuous 10. vapour control layer 11. insulation mineral wool or PIR 12. breather membrane with rolled bead - In some cases it is recommended to provide snow guards. - When rendering a wall it is recommended to protect the VM ZINC. For curved roof The mimimum pitch at the ridge must be at least 3 over first metre Wall abutment head slope min. 3 2. head saddle piece in VM ZINC 3. breather membrane 4. vapour control layer 5. insulation mineral wool or PIR 6. roof boarding 7. sheet clip in VM ZINC PLUS, th = 0.7 mm, 8. continuous capping piece in VM ZINC PLUS 9. wall 10. mastic sealant, compatible with VM ZINC 11. fixing wedge 12
For curved roof The minimum pitch at the ridge must be at least 3 over the first metre. Ridge pitch min. 2. saddle piece in VM ZINC 3. ridge piece in VM ZINC PLUS, th = 0.7 mm 4. sheet clip in VM ZINC PLUS, th = 0.7 mm, 5. rafter 6. breather membrane 7. vapour control layer 8. insulation mineral wool or PIR Roof abutment 2. sheet clip in VM ZINC PLUS, th = 0.7 mm, 3. VM ZINC PLUS stepped flashings chased into the wall 4. mastic sealant, compatible with VM ZINC 5. breather membrane 6. vapour control layer 7. insulation mineral wool or PIR 8. fixing wedge 13
Standing Seam - Roofing Warm roof on mineral wool or PIR Verge 2. insulation mineral wool or PIR 3. sliding clip VM ZINC in stainless steel, (manually adapted/tranformed) 4. fascia in VM ZINC PLUS 5. continuous edge flashing in VM ZINC PLUS 6. wall 7. breather membrane 8. vapour control layer Valley detail (to be used for roof pitches in excess of 14 ) R = overlap - see page 76 2. sheet clip in VM ZINC PLUS, th = 0.7 mm, 3. continuous double welt strip in VM ZINC, continuously soldered 4* In some conditions a water flow controler can be necessary. 4. water flow controler* 5. breather membrane 6. vapour control layer 7. insulation mineral wool or PIR 8. valley gutter in VM ZINC PLUS 9. screw, 20 mm longer than the thickness of the isulation In some cases it is recommended to provide snow guards. 14
Box valley gutter L = Flashing length - see page 76 2. continuous eaves apron strip in VM ZINC PLUS 3. sheet clip in VM ZINC PLUS, th = 0.7 mm, 4. folded strip in VM ZINC PLUS, th = 0.7 mm, continuous 5. overflow 6. rafter, 5 mm thinner than the insulation 7. heating cables (if required) 8. box gutter in VM ZINC PLUS 9. breather membrane 10. insulation mineral wool or PIR 11. vapour control layer - In some cases it is recommended to provide snow guards. Hip 2. saddle piece in VM ZINC 3. hip piece in VM ZINC PLUS, th = 0.7 mm 4. sheet clip in VM ZINC PLUS, th = 0.7 mm, 5. rafter 6. breather membrane 7. vapour control layer 8. insulation mineral wool or PIR 15
Standing Seam - Roofing Warm roof on mineral wool or PIR L = Flashing length - see page 76 Mansard 2. continuous eaves apron strip in VM ZINC PLUS 3. sheet clip in VM ZINC PLUS, th = 0.7 mm, 4. folded strip in VM ZINC PLUS, th = 0.7 mm, contiunuous 5. insulation in mineral wool or PIR 6. rafter, 5 mm thinner than the insulation 7. breather membrane 8. vapour control layer In some cases it is recommended to provide snow guards. For a mansard pitch stronger than 60, it s IMPORTANT to contact the technical service of VM ZINC. independent flashing R = overlap - see page 76 Junctions skylight (min. pitch 14 ) standing seam in VM ZINC 1. standing seam in VM ZINC PLUS PLUS 2. saddle piece in VM ZINC 3. insulation mineral wool or PIR continuous welting strip 4. skylight flashing section DD skylight saddle piece section AA Overview To allow for the expansion of the VM ZINC, we cover the chassis of the skylight with an independent flashing. The above standing seam sheets are welted to this flashing. This flashing is laterally locked in the standing seam. section BB section CC 5. roof boarding 6. vapour control layer 7. sheet clip in VM ZINC PLUS, th = 0.7 mm, 8. continuous double welt strip in VM ZINC PLUS, continuously soldered 9. flashing in VM ZINC PLUS to witch the standing seam is fixed 10. water deflector piece, pitch min. 0.5 11. breather membrane 12. screw, 20 mm longer than the thickness of the insulation 13. fold 20 mm 16
standing seam in VM ZINC PLUS Junctions skylight (pitch above 3 ) laid seam, soldered continuously section AA skylight Overview saddle piece Penetrations must not interupt more than three seams. At this level, expansion of the VM ZINC must be, towards the ridge not the eaves, = no fixed clip at the ridge. section CC section BB 2. saddle piece in VM ZINC 3. vapour control layer 4. skylight flashing 5. roof boarding 6. insulation mineral wool or PIR 7. sheet clip in VM ZINC PLUS, th = 0.7 mm, 8. continuous double welt strip in VM ZINC PLUS, continuously soldered 9. standing seam fold, fixed and soldered 10. breather membrane 11. water deflector piece, min. pitch 0.5 12. fold 20 mm Junction with chimney in stainless steel (between two seams) 2. breather membrane 3. tube in VM ZINC 4. twinwall chimney in stainless steel with insulation 5. flashing piece in stainless steel 6. mastic sealant, compatible with VM ZINC 7. flashing collar in VM ZINC (dot soldering) 8. insulation in mineral wool or PIR 9. vapour control layer *: Fire space in accordance with the building regulations E: make allowances for the expansion & contraction of the VM ZINC (depending of the temperature when applied) Note: the top of the chimney must be high enough to prevent deposit falling onto the roof. We recommend the use of an uncovered finishing cone for fuel oil heating chimneys. 17
Standing Seam - Roofing Warm roof on composite panels 4 1 2 3 Composition of roof 1 2 3 4 Composite panel Tape / aluminium faced Breather membrane VM ZINC PLUS standing seam 18
Installation of this system see pages 66 to 79 >Arch. P. Poncin - QUARTZ-ZINC Area of application Roofs with a pitch from 3 to 60. Classes of internal humidity load: 1 to 4. VM ZINC, the choices Only PLUS type VM ZINC with a specially protected underside: Natural VM ZINC PLUS, QUARTZ-ZINC PLUS or ANTHRA-ZINC PLUS. 0.7 mm thick. Characteristics of this technique With this warm roof system VM ZINC PLUS standing seam can be installed on composite panels without ventilating the underside of the VM ZINC PLUS. For all applications: 1. the substrate of the composite panels (on the warm side of the roof panel) must be covered with a vapour control layer material with vapour resistance always greater than the sum of the resistance of the elements fixed above the vapour control layer. It must be adapted to the internal humidity load of the building. 2. the joints between the composite panels must be totally air tight and have good vapour retarder properties. 3. breather membrane (Tyvek type 2480b or equivalent) should be installed between the VM ZINC PLUS and the composite panels. This breather membrane must be open to water vapour and completely watertight. The breather membrane must end into the gutter. Structure A choice of: Upper layer of the composite panel: solide wood panels or other panels, all certified for roofing applications (min. thickness: 12 mm). Particular attention to be put on certification of the upper facing of these panels for roofing usage. Upper layer able to resist pull out forces of 50daN/standing seam fixing clip (dynamic testing method). Galvanised steel internal and external facing (min. thickness: 0.7 mm for external facing). Particular attention to be put on certification of these panels for roofing usage. Upper layer able to resist pull out forces of 50daN/standing seam fixing clip (dynamic testing method). No delamination of the panel and pull out resistance decrease under wet conditions. N.B. The information relating to the installation of the composite panels and membranes is simply an indication. The choice and installation of these products will be according to the recommendations of the panels and membrane manufacturers. Specifications: : See www.vmzinc.co.uk : See www.vmzinc.ie 19
Standing Seam - Roofing Warm roof on composite panels Fixing clips to be used code fig. description material qty/box 1 205709000 1 Fixed clips with stainless steel 100 countersunk screw holes 2 205710000 2 Sliding clips with stainless steel 250 countersunk screw holes Fixing the clips Chrome coated screws of a diameter, length and type appropriate to the structure. 20
Examples of details The solutions presented here are simply examples and not the only ones possible. Our technical assistance department is available to study other solutions with you. Gutter L = Flashing length - see page 76 - In some cases it is recommended to provide snow guards. - When rendering a wall it is recom mended to protect the VM ZINC. 2. continuous eaves apron strip in VM ZINC PLUS 3. folded strip in VM ZINC PLUS, th = 0.7 mm, continuous 4. sheet clip in VM ZINC PLUS, th = 0.7 mm, 5. loadbearing structure 6. continuous sheet strip in VM ZINC PLUS, th = 0.7 mm 7. flashing in VM ZINC PLUS 8. PLULINE gutter bracket 9. PLULINE gutter 10. rafter, 5 mm thinner than the insulation 11. breather membrane 12. composite panel Variation pitch min. 1 pitch min. 1 R = overlap - see page 76 Box gutter (gutter outside the wall) 2. sheet clip in VM ZINC PLUS, th = 0.7 mm, 3. continuous double welt strip in VM ZINC PLUS, continuously soldered 4. rafter, 5 mm thinner than the insulation 5. roof boarding 6. box gutter in VM ZINC 7. bracket in VM ZINC, th = 1 mm, w = 250 mm, 2 per m 8. fascia with welted panels in VM ZINC, dimensions maximum for each panels: 400 x 2000 mm 9. ventilated space 10. continuous welt piece in VM ZINC 11. mesh (2 mm maximum weave) 12. packers fixed to gutter fall 13. continuous strip in VM ZINC, th = 0.8 mm 14. composite panel 15. breather membrane Variation - In some cases it is recommended to provide snow guards. - When rendering a wall it is recommended to protect the VM ZINC. 21
Standing Seam - Roofing Warm roof on composite panels pitch min. 1 L = Flashing length - see page 76 with flat folded clip pitch min. 1 Box gutter (gutter inside or on the wall) with rolled bead - In some cases snow guards and/or heating cables should be planned. - When rendering a wall it is recommended to protect the VM ZINC. 2. continuous eaves apron strip in VM ZINC PLUS 3. sheet clip in VM ZINC PLUS, th = 0.7 mm, 4. folded strip in VM ZINC PLUS, th = 0.7 mm, continuous 5. continuous sheet strip in VM ZINC PLUS, th = 0.7 mm 6. rafter, 5 mm thinner than the insulation 7. roof boarding 8. box gutter in VM ZINC PLUS 9. bracket in VM ZINC PLUS, th = 0.7 mm, continuous 10. composite panel 11. breather membrane For curved roof The minimum pitch at the ridge must be at least 3 over the first metre. Wall abutment head pitch min. 3 2. head saddle piece in VM ZINC 3. breather membrane 4. composite panel 5. mastic sealant, compatible with VM ZINC 6. roof boarding 7. sheet clip in VM ZINC PLUS, th = 0.7 mm, 8. continuous capping piece in VM ZINC PLUS 9. fixing wedge 22
For curved roof The minimum pitch at the ridge must be at least 3 over the first metre. Ridge pitch min. 3 2. saddle piece in VM ZINC 3. ridge piece in VM ZINC PLUS 4. sheet clip in VM ZINC PLUS, th = 0.7 mm, 5. rafter 6. breather membrane 7. composite panel Roof abutment 2. sheet clip in VM ZINC PLUS, th = 0.7 mm, 3. VM ZINC PLUS stepped flashings chased into the wall 4. mastic sealant, compatible with VM ZINC 5. breather membrane 6. composite panel 7. fixing wedge 23
Standing Seam - Roofing Warm roof on composite panels Verge 2. composite panel 3. sliding clip VM ZINC in stainless steel, (manually adapted/tranformed) 4. fascia in VM ZINC PLUS 5. continuous edge flashing in VM ZINC PLUS 6. wall 7. breather membrane R = overlap - see page 76 Valley detail (to be used for roof pitches in excess of 14 ) 4* In some conditions a water flow controler can be necessary. 2. sheet clip in VM ZINC PLUS, th = 0.7 mm, 3. continuous double welt strip in VM ZINC PLUS, continuously soldered 4. water flow controler* 5. breather membrane 6. composite panel 7. valley gutter in VM ZINC PLUS In some cases it is recommended to provide snow guards. 24
Box valley gutter L = Flashing length - see page 76 2. continuous eaves apron strip in VM ZINC PLUS 3. sheet clip in VM ZINC PLUS, th = 0.7 mm, 4. folded strip in VM ZINC PLUS, th = 0.7 mm, continuous 5. overflow 6. rafter, 5 mm thinner than the insulation 7. heating cables (if required) 8. box gutter in VM ZINC PLUS 9. breather membrane 10. composite panel - In some cases it is recommended to provide snow guards. Hip 2. saddle piece in VM ZINC 3. ridge piece in VM ZINC PLUS 4. sheet clip in VM ZINC PLUS, th = 0.7 mm, 5. rafter 6. breather membrane 7. composite panel 25
Standing Seam - Roofing Warm roof on composite panels L = Flashing length - see page 76 Mansard 2. continuous eaves apron strip in VM ZINC PLUS 3. sheet clip in VM ZINC PLUS, th = 0.7 mm, 4. folded strip in VM ZINC PLUS, th = 0.7 mm, continuous 5. composite panel 6. breather membrane In some cases it is recommended to provide snow guards. For a mansard pitch stronger than 60, it s IMPORTANT to contact the technical service of VM ZINC. independent flashing standing seam in VM ZINC PLUS R = overlap - see page 76 Junctions skylight (min. pitch 14 ) continuous welting strip skylight section DD 2. saddle piece in VM ZINC 3. composite panel 4. skylight flashing 5. roof boarding saddle piece Overview To allow for the expansion of the VM ZINC, we cover the chassis of the skylight with an independent flashing. The above standing seam sheets are welted to this flashing. This flashing is laterally locked in the standing seam. section BB section AA 6 section CC 6. sheet clip in VM ZINC PLUS, th = 0.7 mm, 7. fold 20 mm 8. continuous double welt strip in VM ZINC PLUS, continuously soldered 9. flashing in VM ZINC PLUS to witch the standing seam is fixed 10. water deflector piece, pitch min. 0.5 11. breather membrane 26
standing seam in VM ZINC PLUS Junctions skylight (pitch above 3 ) laid seam, soldered continuously section AA skylight saddle piece Overview Penetrations must not interupt more than three seams. At this level, expansion of the VM ZINC must be, towards the ridge not the eaves, = no fixed clip at the ridge. section CC section BB 2. saddle piece in VM ZINC 3. breather membrane 4. skylight flashing 5. roof boarding 6. composite panel 7. sheet clip in VM ZINC PLUS, th = 0.7 mm, 8. double welt in VM ZINC PLUS, continuously soldered 9. standing seam fold, fixed and soldered 10. fold 20 mm 11. water deflector piece, min. pitch 0.5 Junction with chimney in stainless steel (between two seams) 2. breather membrane 3. tube in VM ZINC 4. twinwall chimney in stainless steel with insulation 5. flashing piece in stainless steel 6. mastic sealant, compatible with VM ZINC 7. flashing collar in VM ZINC (dot soldering) 8. composite panel *: Fire space in accordance with the building regulations E: make allowances for the expansion & contraction of the VM ZINC (depending of the temperature when applied) Note: the top of the chimney must be high enough to prevent deposit falling onto the roof. We recommend the use of an uncovered finishing cone for fuel oil heating chimneys. 27
Standing Seam - Roofing Warm roof on cellular glass 7 4 6 5 3 2 1 Composition of the roof 1 2 3 4 5 6 7 Interior finish Support structure (e.g. steel deck) Cellular glass Galvanised steel plates Bituminous membrane Separation layer / 1000 guage PE film VM ZINC PLUS standing seam 28
Installation of this system see pages 66 to 79 >Arch. S & C Molina - QUARTZ-ZINC PLUS Area of application Roofs with a pitch from 3 to 45. Classes of internal humidity load: 1 to 5. On all structures compatible with the installation of cellular glass (e.g. wood, concrete, steel deck, according to the manufacturer s specifications). Renovation of waterproof bitumen roof (according to the cellular glass manufacturer s specifications). VM ZINC, the choices Only PLUS type VM ZINC with a specially protected underside: Natural VM ZINC PLUS, QUARTZ-ZINC PLUS or ANTHRA-ZINC PLUS. 0.7 mm thick. Characteristics of this technique This warm roof system allows the installation of VM ZINC PLUS standing seam on cellular glass insulation without penetrating fastenings. Structure Cellular glass glued to its structure. The cellular glass is then covered with a coating of bitumen. Galvanised steel plates, which the insulation manufacturer has to supply, are glued to the bitumen coated cellular glass. The plates must be positioned in collaboration with the VM ZINC installer. A reinforced heat-sealable membrane is then sealed by torching to the entire surface of the insulation without overlapping. This membrane also covers the plates. In order to avoid any contact between the VM ZINC PLUS and the bituminous membrane, a transparent polyethylene separation membrane is fixed with an overlap of + 150 mm. The VM ZINC PLUS panels are fixed to this structure with special clips screwed into the galvanised steel plates. N.B. The information relating to the installation of insulation, plates and membranes is simply an indication. The choice and installation of these products will be according to the recommendations of the insulation manufacturer. Specifications: : See www.vmzinc.co.uk : See www.vmzinc.ie 29
Standing Seam - Roofing Warm roof on cellular glass Fixing clips to be used code fig. description material qty/box 1 205709000 1 Fixed clips with stainless steel 100 countersunk screw holes 205710000 2 Sliding clips with stainless steel 250 countersunk screw holes 2 Fixing the clips 4,8 mm Philips no. 2 conical head recessed screws, with a minimum length of 16 mm, or an equivalent with the same characteristics must be used. 30
Examples of details The solutions presented here are simply examples and not the only ones possible. Our technical assistance department is available to study other solutions with you. Gutter L = Flashing length - see page 76 - In some cases it is recommended to provide snow guards. - When rendering a wall it is recom mended to protect the VM ZINC. 2. continuous eaves apron strip in VM ZINC PLUS 3. continuous folded strip in VM ZINC PLUS, th=0.7 mm 4. sheet clip in VM ZINC PLUS, th = 0.7 mm, 5. loadbearing structure 6. continuous sheet strip in VM ZINC PLUS, th = 0.7 mm 7. flashing in VM ZINC PLUS 8. PLULINE gutter bracket 9. PLULINE gutter 10. rafter, 5 mm thinner than the insulation 11. PE-film 12. bituminous membrane 13. cellular glass Variation pitch min. 1 pitch min. 1 R = overlap - see page 76 Box gutter (gutter outside the wall) 2. sheet clip in VM ZINC PLUS, th = 0.7 mm, 3. continuous double welt strip in VM ZINC, soldered 4. rafter, 5 mm thinner than the insulation 5. roof boarding 6. box gutter in VM ZINC 7. bracket in VM ZINC, th = 1 mm, w = 250 mm, 2 per m 8. fascia with welted panels in VM ZINC, dimensions maximum for each panel: 400 x 2000 mm 9. ventilated space 10. continuous welt piece in VM ZINC 11. mesh (2 mm maximum weave) 12. packers fixed to gutter fall 13. continuous strip in VM ZINC, th = 0.8 mm 14. cellular glass 15. bituminous membrane 16. PE-film Variation - In some cases it is recommended to provide snow guards. - When rendering a wall it is recommended to protect the VM ZINC. 31
Standing Seam - Roofing Warm roof on cellular glass L = Flashing length - see page 76 Box gutter (gutter inside or on the wall) with flat folded clip pitch min. 1 pitch min. 1 with rolled bead 2. continuous eaves apron strip in VM ZINC PLUS 3. sheet clip in VM ZINC PLUS, th = 0.7 mm, 4. folded strip in VM ZINC PLUS, th = 0.7 mm, continuous 5. continuous sheet strip in VM ZINC PLUS, th = 0.7 mm 6. rafter, 5 mm thinner than the insulation 7. roof boarding 8. box gutter in VM ZINC PLUS 9. bracket in VM ZINC PLUS, th = 0.7 mm, continuous 10. bituminous membrane 11. PE-film 12. cellular glass - In some cases snow guards and/or heating cables should be planned. - When rendering a wall it is recommended to protect the VM ZINC. For curved roof The minimum pitch at the ridge must be at least 3 over the first metre. Wall abutment head pitch min. 3 2. head saddle piece in VM ZINC 3. PE-film 4. bituminous membrane 5. cellular glass 6. roof boarding 7. sheet clip in VM ZINC PLUS, th = 0.7 mm, 8. continuous capping piece in VM ZINC PLUS 9. fixing wedge 10. mastic sealant, compatible with VM ZINC - When rendering a wall it is recommended to protect the VM ZINC. 32
For curved roof The minimum pitch at the ridge must be at least 3 over the first metre. Ridge pitch min. 2. saddle piece in VM ZINC 3. sheet clip in VM ZINC PLUS, th = 0.7 mm, 4. ridge piece in VM ZINC PLUS, th = 0.7 mm 5. rafter 6. PE-film 7. bituminous membrane 8. cellular glass Roof abutment 2. sheet clip in VM ZINC PLUS, th = 0.7 mm, 3. VM ZINC PLUS stepped flashings chased into the wall 4. mastic sealant, compatible with VM ZINC 5. PE-film 6. bituminous membrane 7. cellular glass 8. fixing plate in galvanised steel 9. fixing wedge - When rendering a wall it is recommended to protect the VM ZINC. 33
Standing Seam - Roofing Warm roof on cellular glass Verge 2. cellular glass 3. sliding clip VM ZINC in stainless steel, (manually adapted/tranformed) 4. fascia in VM ZINC PLUS 5. continuous edge flashing in VM ZINC PLUS 6. wall 7. PE-film 8. bituminous membrane 9. fixing plate in galvanised steel - When rendering a wall it is recommended to protect the VM ZINC. Valley detail (to be used for roof pitches of minimum 14 ) 2. sheet clip in VM ZINC PLUS, th = 0.7 mm, 3. continuous double welt strip in VM ZINC, soldered 4. water flow controler* R = overlap - see page 76 5. PE-film 6. bituminous membrane 7. cellular glass 8. valley gutter in VM ZINC PLUS 9. fixing plate in galvanised steel 4* In some conditions a water flow controler can be necessary. In some cases it is recommended to provide snow guards. 34
Box valley gutter L = Flashing length - see page 76 2. continuous eaves apron strip in VM ZINC PLUS 3. sheet clip in VM ZINC PLUS, th = 0.7 mm, 4. folded strip in VM ZINC PLUS, th = 0.7 mm, continuous 5. overflow 6. rafter, 5 mm thinner than the insulation 7. heating cables (if required) 8. box gutter in VM ZINC PLUS 9. PE-film 10. bituminous membrane 11. cellular glass - In some cases it is recommended to provide snow guards. Hip 2. saddle piece in VM ZINC 3. sheet clip in VM ZINC PLUS, th = 0.7 mm, 4. ridge piece in VM ZINC PLUS, th = 0.7 mm 5. rafter 6. PE-film 7. bituminous membrane 8. cellular glass 35
Standing Seam - Roofing Warm roof on cellular glass L = Flashing length - see page 76 Mansard 2. continuous eaves apron strip in VM ZINC PLUS 3. sheet clip in VM ZINC PLUS, th = 0.7 mm, 4. folded clip in VM ZINC PLUS, th = 0.7 mm, continuous 5. cellular glass 6. fixing plate in galvanised steel 7. PE-film 8. bituminous membrane In some cases it is recommended to provide snow guards. For a mansard pitch stronger than 45, it s IMPORTANT to contact the technical service of VM ZINC. independent flashing Junctions skylight (min. pitch 14 ) standing seam in VM ZINC PLUS continuous welting strip R = overlap - see page 76 2. saddle piece in VM ZINC 3. cellular glass 4. skylight flashing 5. roof boarding skylight section DD saddle piece Overview To allow for the expansion of the VM ZINC, we cover the chassis of the skylight with an independent flashing. The above standing seam sheets are welted to this flashing. This flashing is laterally locked in the standing seam. section AA section BB section CC 6. bituminous membrane 7. sheet clip in VM ZINC PLUS, th = 0.7 mm, 8. continuous double welt strip in VM ZINC PLUS, continuously soldered 9. flashing to witch the standing seam is fixed 10. water deflector piece, pitch min. 0.5 11. PE-film 12. fixing plate in galvanised steel 13. fold 20 mm 36
standing seam in VM ZINC PLUS Junctions skylight (pitch above 3 ) laid seam, soldered continuously section AA skylight saddle piece Overview Penetrations must not interupt more than three seams. At this level, expansion of the VM ZINC must be, towards the ridge not the eaves, = no fixed clip at the ridge. section CC section BB 2. saddle piece in VM ZINC 3. bituminous membrane 4. skylight flashing 5. roof boarding 6. cellular glass 7. sheet clip in VM ZINC PLUS, th = 0.7 mm, 8. continuous double welt strip in VM ZINC, soldered 9. standing seam fold, fixed and soldered 10. PE-film 11. water deflector piece, min. pitch 0.5 12. fixing plate in galvanised steel 13. fold 20 mm Junction with chimney in stainless steel (between two seams) 2. PE-film 3. tube in VM ZINC 4. twinwall chimney in stainless steel with insulation 5. flashing piece in stainless steel 6. mastic sealant, compatible with VM ZINC 7. flashing collar in VM ZINC (dot soldering) 8. cellular glass 9. bituminous membrane *: Fire space in accordance with the building regulations E: make allowances for the expansion & contraction of the VM ZINC (depending of the temperature when applied) Note: the top of the chimney must be high enough to prevent deposit falling onto the roof. We recommend the use of an uncovered finishing cone for fuel oil heating chimneys. 37
Standing Seam - Roofing Ventilated roof on incompatible support 5 8 3 5 7 4 6 2 1 Composition of the roof 1 2 3 4 5 6 7 8 Interior finish Vapour control layer Insulation Breather membrane Ventilated air space Rafter Incompatible support VM ZINC PLUS Standing seam 38
Installation of this system see pages 66 to 79 >Arch. - QUARTZ-ZINC PLUS Areas of application Roofs with a pitch from 3 to vertical. Classes of internal humidity load: 1 to 4. Both renovation and new buildings. VM ZINC, the choices Only PLUS type VM ZINC with a specially protected underside: Natural VM ZINC PLUS, QUARTZ-ZINC PLUS or ANTHRA-ZINC PLUS. PIGMENTO & PIGMENTO Plus. 0.7 mm thick. Characteristics of this technique VM ZINC PLUS is installed on the incompatible support (plywood or panels). A 40 mm* continuous air gap must be left clear beneath the support of the VM ZINC PLUS, on all the roof pitches. Continuous ventilation openings are made at the top and bottom. In order to keep the integrity of the roof, it is recommended to install a breather membrane on the cold side of the insulation and a vapour control layer adapted to the internal humidity load of the building, on the warm side of the insulation. Possible substrates Plywood panels that are not compatible with VM ZINC must be certified for roofing application and at least 18 mm thick. All the substrates must be flat, dry, and sufficiently resistant to all the stresses to which they will be submitted (e.g. pull out force of 50 dan per standing seam fixing clip). This resistance needs to be guaranteed even through ageing of the system and humidity circumstances through the roof structure Maximum difference in height of 1 mm between support elements of the VM ZINC PLUS. The deflection measured under a rigid 600 mm long straight edge cannot exceed 2 mm in all directions. The nails/screws are countersunk in order to avoid any contact with the VM ZINC PLUS. Specifications: : See www.vmzinc.co.uk : See www.vmzinc.ie Arch. Lord Aeck Sargent Architecture - ANTHRA-ZINC PLUS > 39
Standing Seam - Roofing Ventilated roof on incompatible support Fixing clips to be used code fig. description material qty/box 1 205709000 1 Fixed clips with Stainless steel 100 countersunk screw holes 2 205710000 2 Sliding clips with Stainnless steel 250 countersunk screw holes Fixing the clips Chrome coated screws of a diameter, length and type appropriate to the structure. 40
Examples of details The solutions presented here are simply examples and are not the only possibilities. Our technical assistance department is available to study other alternatives with you. L = Flashing length - see page 76 Gutter - In some cases it is recommended to provide snow guards. - When rendering a wall it is recommended to protect the VM ZINC. 2. Sheet clip in vm zinc plus th= 0.7 mm, l=80 mm, 2 per m 3 continuous eaves apron strip in VM ZINC PLUS 4. plywood, 5 mm thinner than adjacent 5. plywood 6. ventilated space 7. folded strip in VM ZINC PLUS, th = 0.7 mm, continuous 8. flashing in VM ZINC PLUS 9. continuous sheet strip in VM ZINC plus, th = 0.7 mm 10. PLULINE gutter bracket 11. PLULINE gutter 12. breather membrane 13. mesh (2 mm max. weave) pitch 1 pitch 1 14 R=overlap page 76 Box gutter (gutter outside the wall) 1. standing seam in VM ZINC 2. sheet clip in VM ZINC, th = 0.7 mm, 3. continuous welting strip in VM ZINC, soldered 4. plywood, 5 mm thinner than adjacent 5. plywood 6. boxed gutter in VM ZINC PLUS 7. bracket in VM ZINC PLUS, th = 0.7 mm, continuous 8. fascia with welted panels in VM ZINC PLUS, dimensions maximum for each panel: 400 x 2000 mm 9. breather membrane 10. continuous welt piece in VM ZINC 11. mesh (2 mm maximum weave) 12. packers laid to gutter fall 13. continuous strip in VM ZINC PLUS, th = 0.7 mm 14. ventilated space - In some cases it is recommended to provide snow guards. - When rendering a wall it is recommended to protect the VM ZINC. 41
Standing Seam - Roofing Ventilated roof on incompatible support L = page 76 Box gutter (gutter inside or on the wall) 9 pitch 1 pitch 1 12 2. continuous eaves apron strip in VM ZINC PLUS 3. sheet clip in VM ZINC PLUS, th = 0.7 mm, 4. folded strip in VM ZINC PLUS, th = 0.7 mm, continuous 5. mesh (2 mm maximum weave) 6. plywood, 5 mm thinner than adjacent 7. plywood 8. box gutter in VM ZINC PLUS 9. bracket in VM ZINC PLUS, th = 0.7 mm, continuous 10. packers laid to gutter fall 11. breather membrane 12. Ventilated space - In some cases it is recommended to provide snow guards. - When cementing a wall it is recommended to protect the VM ZINC. Wall abutment head for curved roof 2. head saddle piece in VM ZINC 3. sheet clip in VM ZINC PLUS, th = 0.7 mm, pitch min. 3 4. continuous capping piece in VM ZINC PLUS 5. timber 6. plywood 7. non-continuous timber 8. mesh (2 mm max weave) 9. fixing wedge 10. mastic sealant, compatible with VM ZINC 11. folded strip in VM ZINC PLUS, th = 0.7 mm, continuous 12. breather membrane 13. ventilated space 42
Ridge pitch min. 3 for curved roof 1. ventilated space 2. plywood 3. sprocket piece 4. mesh (2 mm maximum weave) 5. standing seam in VM ZINC PLUS 6. saddle piece in VM ZINC 7. sheet clip in VM ZINC PLUS, th=0.7 mm, w=80 mm, 2 per m 8. folded clip in VM ZINC 1 mm. L =50mm, 3 per m. 9. ridge piece in VM ZINC PLUS 10. breather membrane, in accordance with specifications Roof abutment 2. sheet clip in VM ZINC PLUS, th = 0.7 mm, 3. VM ZINC PLUS stepped flashings chased into the wall 4. mastic sealant, compatible with VM ZINC 5. breather membrane 6. plywood 7. ventilated space 43
Standing Seam - Roofing Ventilated roof on incompatible support Verge 2. plywood 3. sliding clip VM ZINC in stainless steel, (manually adapted/transformed) 4. fascia in VM ZINC max. 400 x 2000 mm 5. continuous edge flashing in VM ZINC PLUS 6. wall 7. ventilated space 8. breather membrane Valley detail (to be used for roof pitches of minimum 14 ) R = overlap - see page 76 2. sheet clip in VM ZINC PLUS, th = 0.7 mm, 3. continuous welt strip in VM ZINC, soldered continuously 4. plywood 5. plywood 6. valley gutter in VM ZINC 7. ventilated space 8. water flow controler* 9. breather membrane 8* In some conditions a water flow controler can be necessary. In some cases it is recommended to provide snow guards. 44
L = Flashing length - see page 76 Box valley gutter 2. continuous eaves apron strip in VM ZINC PLUS 3. sheet clip in VM ZINC PLUS, th = 0.7 mm, 4. folded strip in VM ZINC PLUS, th = 0.7 mm, continuous 5. mesh (2 mm max weave) 6. plywood, 5 mm thinner than adjacent 7. plywood 8. box gutter in VM ZINC PLUS 9. ventilated space 10. packers fixed to gutter fall 11. breather membrane, in accordance with specifications 12. heating cables (if required) 13. overflow - In some cases it is recommended to provide snow guards. - When rendering a wall it is recom mended to protect the VM ZINC. Hip 1. Ventilated space 2. plywood 3. sprocket piece 4. mesh (2 mm maximum weave) 5. standing seam in VM ZINC PLUS 6. saddle piece in VM ZINC 7. sheet clip in VM ZINC PLUS 8. folded strip in VM ZINC PLUS 9. ridge piece in VM ZINC PLUS 10. breather membrane 45
Standing Seam - Roofing Ventilated roof on incompatible support L = Flashing length - see page 76 Mansard 2. continuous eaves apron strip in VM ZINC PLUS 3. sheet clip in VM ZINC PLUS, th = 0.7 mm, 4. folded strip in VM ZINC PLUS, th = 0.7 mm, continuous 5. plywood, 5 mm thinner than adjacent 6. plywood 7. mesh (2 mm max. weave) 8. ventilated space 9. breather membrane In some cases it is recommended to provide snow guards. independent flashing standing seam in VM ZINC R = overlap - see page 76 Junctions skylight (min. pitch 14 ) continuous welting strip section DD skylight section AA saddle piece Overview To allow for the expansion of the VM ZINC, we cover the chassis of the skylight with an independent flashing. This flashing is laterally locked in the standing seam. section BB section CC 2. saddle piece in VM ZINC 3. fold 20 mm 4. skylight flashing 5. plywood 6. ventilated space 7. sheet clip in VM ZINC PLUS, th = 0.7 mm, 8. continuous double welt strip in VM ZINC, soldered 9. flashing VM ZINC PLUS to witch the standing seam is fixed 10. water deflector piece, pitch min. 0.5 11. breather membrane 12. fold 20 mm 46
Standing seam in VM ZINC laid seam, soldered continuously Junctions skylight (pitch above 3 ) section AA skylight Overview Penetrations must not interupt more than three seams. At this level, expansion of the VM ZINC must be, towards the ridge not the eaves, = no fixed clip at the ridge. saddle piece section BB 2. saddle piece in VM ZINC 3. fold 20 mm 4. skylight flashing 5. plywood 6. ventilated space section CC 7. sheet strip in VM ZINC PLUS, th = 0.7 mm, 8. double welt in VM ZINC, continuously soldered 9. standing seam fold, laid and soldered 10. water deflector piece, min pitch 0.5 11. breather membrane neatly glued in the corners Junction with chimney in stainless steel (between two seams) 2. plywood 3. continuously soldered tube in VM ZINC 4. twinwall chimney in stainless steel with insulation 5. flashing piece in stainless steel 6. mastic sealant, compatible with VM ZINC 7. flashing collar in VM ZINC (dot soldering) 8. breather membrane neatly glued 9. ventilated space *: Fire space in accordance with the building regulations E: make allowances for the expansion & contraction of the VM ZINC (depending of the temperature when applied) Note: the top of the chimney must be high enough to prevent deposit falling onto the roof. We recommend the use of an uncovered finishing cone for fuel oil heating chimneys. Or we recommend the use of chimney/ flue cowl-conical 47
Standing Seam - Roofing Ventilated roof on roof boarding 5 8 3 5 7 4 6 2 1 Composition of the roof 1 2 3 4 5 6 7 8 Interior finish Vapour control layer Insulation Breather membrane Ventilated air space Rafter Roof boarding VM ZINC standing seam 48
Installation of this system see pages 66 to 79 >Arch. M + W Pearce - Natural VM ZINC Areas of application Roofs with a pitch from 3 to vertical. Classes of internal humidity load: 1 to 4. Both renovations and new buildings. VM ZINC, the choices Natural VM ZINC, 5 pre-weathered VM ZINC colours QUARTZ-ZINC, ANTHRA-ZINC, PIGMENTO red, green, blue: 0.7 or 0.8 mm thick. 6 Bilacquered VM ZINC colours: 0.7 mm thick. Non standard bilaquered VM ZINC colours are also available (for large quantities, any colour - min. orders 10 Tons). Please contact our technical office for further information. Characteristics of this technique VM ZINC is installed on the roof boarding. A 40 mm* continuous air gap must be left clear beneath the roof boarding, on all the roof pitches. Continuous ventilation openings are made at the top and bottom. In order to keep the integrity of the roof, it is recommended to install a breather membrane on the cold side of the insulation and a vapour control layer adapted to the internal humidity load of the building, on the warm side of the insulation. Structure Clean and dry 100 to 150 mm wide, 18 or 24 mm thick softwood boarding, according to the rafter centres. Any wood treatment products (fungicides, insecticides) must be dry and completely neutral in relation to VM ZINC (cf appendix 6 page 80). The roof boards are fixed perpendicular to the direction of the pitch leaving a 3 to 5 mm gap between them. They are securely fixed to the structure. Maximum difference in height of 1 mm between roof boards. The deflection measured under a rigid 600 mm long straight edge cannot exceed 2 mm in all directions. The roof board nails are countersunk in order to avoid any contact with the VM ZINC. Specifications: *Cf. appendix 5 page 79 : See www.vmzinc.co.uk : See www.vmzinc.ie roof boarding > 49