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elZinc Standing Seam Roofing

elZinc Standing Seam Roofing

elZinc Third party certifications:
  • EnMS ISO 50001

    EnMS ISO 50001

    Certificate type

  • QMS ISO 9001

    QMS ISO 9001

    Certificate type

  • EMS ISO 14001

    EMS ISO 14001

    Certificate type

  • OMS ISO 45001

    OMS ISO 45001

    Certificate type

Traditional fully supported architectural roofing system composed of site-seamed zinc trays.

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+44 (0) 203 468 8956 www.elzinc.co.uk

Application

Roofing from 3º pitch to 89º. Flat, curved or double curved.

Description

elZinc® standing seam 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 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

Light, medium or dark.

Red

Blue

Brown

Gold

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Finish

Natural

Pre-weathered

Material

Titanium zinc

Shape

Rectangle

Length

Bespoke

Width

430 mm

WarrantyDescription

Lifetime

Alkimi range.

20 year

Rainbow range.

Uniclass

Ss_30_40_50_95 Zinc sheet fully supported roof covering systemsPrimary

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 Enhanced data

System performance

Weatherproof roof covering.

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

Insert 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

Ventilated 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.

Not required.

VCL with an sd value of 100 m.

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.

All edges lapped and sealed, and wrapped around edges of insulation. Self sealing around any penetrating fasteners.

Carrier

Select carrier (carrier of substrate) from list below, adding any appropriate comments.

Softwood battens.

With suitable wood preservative treatment, height 50 mm minimum or according to ventilating cavity depth. Use softwood battens for open gap boarding.

Metal purlins.

Use metal purlins for metal decks, insulated metal panels.

Fully supporting deck.

Use over roof rafters/structure for rigid insulation and foamglas.

Roof rafters for plywood sheathing.

Roof rafters are normally the carrier for plywood.

Substrate

Select 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.

Sheathing/ boarding.

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.

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.

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.

To give a minimum clip pull-out value of 560N, with seals on the inside face between panels to ensure vapour tightness.

Rigid insulation.

Stable up to 100ºC, able to resist foot traffic and kneeling operatives without compressing.

Foamglas insulating boards.

Installed according to manufacturer's instructions, providing a vapour-tight substrate.

Open gap softwood boarding according to EN 12775-2, 18 mm.

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.

Cavity barriers

Sleeved mineral wool cavity barriers

Sheet underlay

-

Material

  • Vented open gap boarding substrate, roof pitch below 15º - structural underlay (mat only).
  • Vented open gap boarding above 15º of pitch - none.
  • Vented plywood sheathing / metal deck - structural underlay (breather membrane + mat).
  • Unvented substrates - Breather membrane.

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.

Edges of breather lapped and taped.

Breather membrane - max sd value of 0,04 m.

Edges lapped and taped.

Zinc

Rolled according to EN988 and ASTM B69-13. Specify Protect+ back coating for unventilated roofs.

0.7 mm-thick elZinc® titanium zinc.

0.8 mm-thick elZinc® titanium zinc.

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.

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.

Open gap boarding/wooden sheathing.

A2 stainless steel wood screws - countersunk head, 4.5 x 25 mm.

Open gap boarding/wooden sheathing.

A2 stainless steel pop rivet - 3.2 mm diameter.

Metal deck/insulated metal panel/ foamglass steel plates.

A2 stainless steel self-tapping screw - flat head, 4.8 x 25 mm.

Metal deck/insulated metal panel/ foamglass steel plates.

Eave details

-

Form

If the roof is ventilated, use one the vented options.

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.

Fixings

T-plate with weather check rebated into substrate, over zinc flat lock fascia.

For free edge with ventilation inlet over zinc fascia and free edge over zinc fascia.

T-plate with weather check rebated into substrate.

For free edge with ventilation inlet and free edge.

T-plate with weather check rebated into substrate over gutter brackets which are fixed flush.

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.

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.

For low profile ventilated option.

Timber support to zinc capping.

For ventilated option.

Batten with zinc capping.

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.

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.

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

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

If 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.

elZinc Crystal®.

elZinc Graphite®.

elZinc Lava®.

elZinc Natural.

elZinc Oliva®.

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FireRating

A1.

Co-efficient of linear thermal expansion

0.000022/ºC.

Panel Type

Insert standing seam profile requirements, can be tapered, pre-curved to concave or convex panels.

Gutter

Internal gutter.

  • Laid to a fall of 1 in 80 and held in place by zinc clips every 500mm, allowing free thermal expansion and contraction. 
  • 0.7 mm titainium zinc / 0.8 mm titanium zinc.

Valley gutter, Roof pitch ≤10º.

  • Recessed valley gutter with T-plate connection to roofing sheets.
  • Material: Same as roofing sheet.

Valley gutter, Roof pitch <10º, <25º.

Valley gutter with laplock connection to roofing sheets.

Material: Same as roofing sheet.

Valley gutter, Roof pitch <25º.

  • Valley gutter with single lock cross welt connection to roofing sheets.
  • Material: Same as roofing sheet.

Hanging external eaves gutter, half-round.

  • Fitted on gutter brackets to a fall of 3-5 mm/m.
  • 0.7 mm elZinc titanium zinc.
  • Appropriately placed according to local regulations and zinc manufacturer's guidelines.

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Overflow

Not required.

Manufacturer's standard.

Appropriately placed overflows. Consideration should be given to providing overflows in case of outlet blockages.

Expansion joints

Manufacturer's standard.

Expansion joints to be appropriately placed according to local regulations and zinc manufacturer's guidelines.

Environmental information

Contains Red List materials

No

Country of material origin

Spain

Country of product manufacture

Spain

Recyclability

100%

Fully recyclable.

Recycled content

20 %

Approximate.

Case studies

Demonstration house in Blunham, Bedfordshire

Demonstration house in Blunham, Bedfordshire

How to rehabilitate the identity of a building by means of zinc roofing

How to rehabilitate the identity of a building by means of zinc roofing

Industrial architecture reinvented

Industrial architecture reinvented

The zinc house by the lake

The zinc house by the lake

Adelaide Convention Centre
East building – Phase 2

Adelaide Convention Centre East building – Phase 2

Third party certifications

EnMS ISO 50001

EnMS ISO 50001

ISO 50001

QMS ISO 9001

QMS ISO 9001

ISO 9001

EMS ISO 14001

EMS ISO 14001

ISO14001

OMS ISO 45001

OMS ISO 45001

ISO45001