Standing Seam Roofing elZinc - Zinc Roofing
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ISO 9001 Quality Management
Certificate type
ISO 45001 Health and Safety Management
Certificate type
EPD
Certificate type
KIWA BDA
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Traditional fully supported architectural standing seam roofing system composed of site-seamed zinc trays.
Application
Zinc standing seam for roofing from 3º pitch to 89º. Flat, curved or double curved.
Description
elZinc® standing seam roof is a traditional fully supported architectural roofing system composed of site-seamed zinc trays. The seamed joint is very discrete, being only 25 mm high, and the pan of the tray is flat. The standing seam zinc roofing can be used to cover roofs pitched above 3º all the way to the vertical. The zinc trays can be tapered, pre-curved to concave or convex panels, so almost any architectural geometry can be weathered using this system. Slight oil canning (quilting) is sometimes apparent, adding extra character to the zinc roof.
The trays are made of 0.65, 0.7 or 0.8 mm thick elZinc titanium zinc rolled according to EN 988 and ASTM B69-13.
Cladding weight is between 6–7 kg/m². Trays are fixed back to sheathing/ boarding using stainless steel clips secured at pre-determined centres (according to exposure) by stainless steel (A2 grade) fasteners. Sheathing/ boarding to be laid flush and flat, and its fasteners driven just below the surface. For buildings that require a non-combustible substrate for the zinc, trapezoidal metal sheet panels are used as a substitute for the wooden sheathing/ boarding.
The standing seam roof either follows a ventilated design or an unventilated (warm) roof design. If ventilated, a space of between 50–100 mm (depending on rafter length) is incorporated under the substrate, and a structural underlay (and draining membrane) is sometimes required under the zinc to ensure air circulation to its underside. Installed in an unventilated (warm) roof design, suitable methods for condensation control are required, and elZinc Protect+ must be used.
Features and benefits:
- Proven, versatile system for roofing flat, curved and ‘free-form’ roofs.
- Weather-tight down to 7º of pitch, 3º if seams are sealed.
- Discrete joints give a light, elegant appearance.
- Modern profiling and seaming machines facilitate short installation times.
- On-the-roof detailing uses folding techniques or soldered joints – no mastic.
- Items such as snow guards and life line attachments are readily available.
General information
Color | Grey Guidance for specification option: Light, medium or dark. Red Blue Brown Gold |
Finish | Natural Pre-weathered |
Material | Zinc Guidance for specification option: Titanium zinc. |
Shape | Rectangle |
Length | Bespoke |
Width | 430 mm |
Warranty description | Lifetime Guidance for specification option: Alkimi range. 20 year Guidance for specification option: Rainbow range. |
Uniclass | |
CAWS | H74/3 Zinc sheet fully supported roof covering H74/110 Zinc sheet fully supported roof covering |
Specification data - Zinc sheet fully supported roof covering systems
System performance | Weatherproof roof covering.Guidance for specification option: Standing seam zinc trays shall provide a weathertight roof, free draining causing no ponding, able to freely expand and contract in response to temperature changes, and fitted to resist all loading including wind loads. The appearance of the roofing and cladding shall be one composed of flat trays or panels, without excessive oil canning, of straight joints and neat folds, correctly set out according to the architect’s drawings and design intent. |
Insulation | Manufacturer guidanceInsert requirement. A zinc roof does not place any special requirement on the insulation, unless used as the substrate for the zinc in warm roofs. In this case, the insulation must be stable up to 100ºC, and not compress due to foot traffic or kneeling operatives, so as not to deform the zinc sheets. |
Air and vapour control layer | Not required.VCL with an sd value of 100 m.Guidance for specification option: All edges lapped and sealed, and wrapped around edges of insulation, in accordance with membrane manufacturer's instructions. High performance vapour barrier with an sd value of 1500 m or above.Guidance for specification option: All edges lapped and sealed, and wrapped around edges of insulation. Self sealing around any penetrating fasteners. Manufacturer guidanceVentilated roofs - a vcl with a minimum sd value of 100 m should be installed under the insulation. Unventilated roofs using rigid insulation as the substrate - a high performance vapour barrier with an sd value of 1500 m should be fitted under the insulation. This must be self sealing around any fasteners that pentrate it. Foamglas insulation - none required - the insulation acts as the vapour barrier. |
Carrier | Softwood battens.Guidance for specification option: With suitable wood preservative treatment, height 50 mm minimum or according to ventilating cavity depth. Use softwood battens for open gap boarding. Metal purlins.Guidance for specification option: Use metal purlins for metal decks, insulated metal panels. Fully supporting deck.Guidance for specification option: Use over roof rafters/structure for rigid insulation and foamglas. Roof rafters for plywood sheathing.Guidance for specification option: Roof rafters are normally the carrier for plywood. Manufacturer guidanceSelect carrier (carrier of substrate) from list below, adding any appropriate comments. |
Substrate | Sheathing/ boarding.Guidance for specification option: Sheathing/ boarding laid flush, true and plumb, and its fasteners driven just below the surface. For buildings that require a non-combustible substrate for the zinc, trapezoidal metal sheet panels are used as a substitute for the wooden sheathing/ boarding. Ventilated plywood substrate, 18 mm.Guidance for specification option: Service class 2 according to EN636, and 'good one side'. Installed in a staggered layout, parrallel to eaves, with a 3-5mm gap between boards, all edges supported and fastener heads driven below surface. Ventilated galvanized steel metal deck, 0.7 mm minimum.Guidance for specification option: To give a minimum clip pull-out value of 560 N, installed 'façade side outwards' to give maximum support to the zinc trays, parallel to eaves, all ends supported. Unventilated insulated metal panel, outside metal skin, 0.7 mm minimum.Guidance for specification option: To give a minimum clip pull-out value of 560N, with seals on the inside face between panels to ensure vapour tightness. Rigid insulation.Guidance for specification option: Stable up to 100ºC, able to resist foot traffic and kneeling operatives without compressing. Foamglas insulating boards.Guidance for specification option: Installed according to manufacturer's instructions, providing a vapour-tight substrate. Open gap softwood boarding according to EN 12775-2, 18 mm.Guidance for specification option: Maximum moisture content 18% and compatible with zinc and treated with zinc-compatible wood preservatives, rough sawn, 18 mm thick minimum, 80 to 125 mm wide, fixed parallel to eaves with fastener heads driven just below surface. Manufacturer guidanceSelect appropriate substrate from list, including any additional requirements. All substrates installed according to substrate manufacturer's guidelines. Other substrate systems are possible - consult zinc manufacturer for further details. |
Cavity barriers | Sleeved mineral wool cavity barriers |
Sheet underlay | |
Material | Not required.Structural underlay open fibrous mat, 8 mm.Structural underlay open fibrous mat, 8 mm (over breather membrane sd value of 0,04 m.Guidance for specification option: Edges of breather lapped and taped. Breather membrane - max sd value of 0,04 m.Guidance for specification option: Edges lapped and taped. Manufacturer guidance
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Zinc | 0.7 mm-thick elZinc® titanium zinc.0.8 mm-thick elZinc® titanium zinc.Manufacturer guidanceRolled according to EN988 and ASTM B69-13. Specify Protect+ back coating for unventilated roofs. |
Longitudinal joints | |
Form | Double lock standing seam of uniform 25 mm height, free from spews and with minimal tool marking. |
Fixing standing seam joints | Stainless steel clips.Guidance for specification option: Fixing of trays use stainless steel clips at a nominal spacing of 300 mm along the length of the standing seam. A general spacing of 300 mm is sufficient for most projects. Clip spacing along the edges of the façade and at the corners may require reducing, and buildings located in exposed areas or over 8 m in height, or in regions exposed to tropical storms will require further study – consult our technical documentation. |
Fasteners to substrate | A2 stainless steel annular ring shank clout nails - 3.35 x 25 mm.Guidance for specification option: Open gap boarding/wooden sheathing. A2 stainless steel wood screws - countersunk head, 4.5 x 25 mm.Guidance for specification option: Open gap boarding/wooden sheathing. A2 stainless steel pop rivet - 3.2 mm diameter.Guidance for specification option: Metal deck/insulated metal panel/ foamglass steel plates. A2 stainless steel self-tapping screw - flat head, 4.8 x 25 mm.Guidance for specification option: Metal deck/insulated metal panel/ foamglass steel plates. |
Eave details | |
Form | Free edge with ventilation inlet over zinc fascia.Free edge with ventilation inlet.Eaves gutter with ventilation inlet.Free edge over zinc fascia.Free edge.Eaves gutter.Manufacturer guidanceIf the roof is ventilated, use one the vented options. |
Fixings | T-plate with weather check rebated into substrate, over zinc flat lock fascia.Guidance for specification option: For free edge with ventilation inlet over zinc fascia and free edge over zinc fascia. T-plate with weather check rebated into substrate.Guidance for specification option: For free edge with ventilation inlet and free edge. T-plate with weather check rebated into substrate over gutter brackets which are fixed flush.Guidance for specification option: For eaves gutter with ventilation inlet and eaves gutter. |
Verge details | |
Form | Standing seam verge with zinc fascia.Batten verge with zinc fascia. |
Verge zinc | As roofing trays. |
Fixing | |
Top edge | Cleats along undercloak of roof tray. |
Bottom edge | T-plate. |
Joints | Flat lock angle standing seam.Guidance for specification option: Flat lock joints are preferred to angle seams as they give a cleaner appearance, but angle seams are possible. |
Ridge and hip details | |
Form | Low profile ventilated.Ventilated.Unventilated. |
Fixings | Galvanised steel support to zinc capping.Guidance for specification option: For low profile ventilated option. Timber support to zinc capping.Guidance for specification option: For ventilated option. Batten with zinc capping.Guidance for specification option: For unventilated option. |
Abutments | |
Form | Side abutment.Head abutment. |
Fixing into joints and chases | |
Fasteners | Standing seam tray - cleats fixed to wall allowing for thermal movement of tray.Guidance for specification option: For side abutment option. Cover flashing - top edge - zinc wedges into chases, bottom edge - continuous cleat fastened with plug and screw. Standing seam tray finished in pinched seam upstand.Guidance for specification option: For head abutment option Cover flashing - top edge - zinc wedges into chases, bottom edge - continuous cleat fastened with plug and screw. |
Pointing to joints and chases | Zinc compatible sealant/mastic. |
Execution | Guidance for specification option: Joints shall set out according to architect’s drawings, or in their absence, according to the design intent of the project. The details of the zinc work should be carried out according recognized good practice and manufacturer’s recommendations. Respect minimum recommended interior radii while bending. Holes should be notched where required to prevent tears forming in the zinc. Marking out: Use a pencil, pen, crayon or chalk. After completion, no marking should be visible. Wherever possible use a mechanical folder to bend material to give straight and uniform folds. Free edges: If visible fold over to form a 15 mm hem. Ensure the temperature of the metal does not fall below 7, or 10°C, depending on the operation, when folding, profiling or forming the metal. Follow elZinc recommendations regarding warming up zinc metal prior to forming. |
Panel width | 430 mm. Bespoke. |
Colour/ Finish | elZinc Crystal®. elZinc Graphite®. elZinc Lava®. elZinc Natural. elZinc Oliva®. Manufacturer guidanceIf a backside coating is required (for example because the zinc is to be installed over an unventilated roof build-up), type 'Protect+' directly after the finish, eg. elZinc Graphite® Protect+. If an ‘Advance’ finish is required, type ‘Advance’ directly after the finish, eg. elZinc Slate Advance. |
FireRating | A1. |
Co-efficient of linear thermal expansion | 0.000022/ºC. |
Panel Type | Guidance for specification option: Insert standing seam profile requirements, can be tapered, pre-curved to concave or convex panels. |
Gutter | Internal gutter. Guidance for specification option:
Valley gutter, Roof pitch ≤10º. Guidance for specification option:
Valley gutter, Roof pitch <10º, <25º. Guidance for specification option: Valley gutter with laplock connection to roofing sheets. Material: Same as roofing sheet. Valley gutter, Roof pitch <25º. Guidance for specification option:
Hanging external eaves gutter, half-round. Guidance for specification option:
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Overflow | Not required. Manufacturer's standard. Guidance for specification option: Appropriately placed overflows. Consideration should be given to providing overflows in case of outlet blockages. |
Expansion joints | Manufacturer's standard. Guidance for specification option: Expansion joints to be appropriately placed according to local regulations and zinc manufacturer's guidelines. |
Sustainability data
Contains Red List materials | No |
Country of material origin | Spain |
Country of product manufacture | Spain |
Material | Zinc Guidance for specification option: Titanium zinc. |
Recyclability | 100% Guidance for specification option: Fully recyclable. |
Recycled contentAs defined in clause 7.8 of BS EN ISO 14021 | 20 % Guidance for specification option: Approximate. |
Third party certifications
Third party certifications
Literature
Architectural solutions in zinc
elZinc Color Chart
elZinc for Roofing and Cladding
elZinc double lock standing seam guide to detail forming
Case studies
Demonstration house in Blunham, Bedfordshire
How to rehabilitate the identity of a building by means of zinc roofing
Industrial architecture reinvented
The zinc house by the lake
Adelaide Convention Centre East building – Phase 2