Sika Sarnafil Metal PVC
PVC-laminated galvanised steel that hot-air welds directly into Sarnafil single-ply membranes, giving roof edges, gutters and upstands a seamless, watertight termination.
What is it?
A factory-laminated composite sheet: a Sarnafil G PVC membrane bonded onto DX51D Z275 galvanised steel, so one face is rigid metal and the other is fully weldable to the roof membrane.
Where is it used?
At the edges and details of Sarnafil single-ply PVC roofs, commercial and industrial roofing, warehouses, gutter linings, parapets and rainwater outlets.
Why use it?
It removes the weak point where membrane meets metal, letting fabricated trims and profiles be welded into the field sheet instead of sealed with mastic that ages and fails.
How is it applied?
Cut and folded to profile on site or in a workshop, mechanically fixed, then the PVC face is hot-air welded to the surrounding Sarnafil membrane.
About Sika Sarnafil Metal PVC
Every single-ply PVC roof lives or dies at its edges. The field membrane can be flawless, but water finds the roof through the perimeter trims, the gutter joints, the parapet cappings and the pipe penetrations where the flat sheet has to meet rigid metal. Sarnafil Metal PVC is Sika’s answer to that junction. It is a coil or sheet of galvanised steel that comes from the factory already laminated with a layer of Sarnafil G PVC membrane, so the fabricator ends up with a metal profile whose top surface is chemically the same material as the roof itself. Instead of relying on sealant or clamped joints to bridge membrane and metal, the installer simply hot-air welds the two together into one continuous, homogeneous skin.
For a distributor audience in Delhi NCR and across India, the appeal is practical. The steel core (DX51D Z275, with an epoxy coating on the cut face) gives the trim its shape and rigidity; the 1.20 mm PVC lamination gives it a weldable, UV-stable surface that matches the membrane’s service life rather than out-living or under-performing it. The sheets and coils can be brake-folded to any drip edge, capping or upstand profile a detail demands, which means one product covers a wide range of roof terminations without carrying a shelf of pre-formed accessories. Because it is a Sarnafil-system component, it is intended to be specified alongside Sarnafil G 410 or S 327 membranes rather than mixed into unrelated roofing build-ups.
The technical insight
The reason this product works comes down to a single principle: weld like to like. A hot-air weld fuses two thermoplastic PVC surfaces into one mass, and that fused seam is as strong and as watertight as the parent material. A sealant joint, by contrast, is only ever as durable as the adhesion and elasticity of the sealant, both of which degrade under UV and thermal cycling. By laminating genuine Sarnafil G PVC (reinforced with a glass non-woven inlay for dimensional stability) directly onto the steel, Sika converts the traditional membrane-to-metal transition into a membrane-to-membrane weld. The galvanised steel underneath handles the mechanical job — holding the folded profile, resisting corrosion, carrying fixings — while the PVC handles the waterproofing continuity. The 3-times-thickness bending radius rule exists to protect that lamination: bend too sharply and you crack or delaminate the PVC skin at the very point where the weld needs to be sound. The specified 3-5 mm gap at butt ends allows for thermal movement of the metal, with the membrane weld carried across the joint doing the sealing.
Where it is used
- Roof edge trims and drip profiles on commercial single-ply PVC roofs
- Perimeter fastening details on industrial and warehouse roofing
- Gutter linings and rainwater outlet junctions
- Parapet cappings and upstand terminations
- Custom-fabricated roof junctions and corner details
- Kerbs, coping details and skirting profiles welded into the field membrane
- Fascia and verge trims on exposed roof edges
Key advantages
- PVC face welds directly into Sarnafil membranes, replacing sealant joints with a homogeneous, watertight seam
- Galvanised DX51D Z275 steel core with epoxy-protected cut edge resists corrosion
- Can be cut, brake-folded and profiled on site or in a metal workshop, so one product serves many detail shapes
- UV-resistant PVC surface matched to the membrane’s exposure life
- Available in six coordinated colours to match or contrast the roof finish
- Supplied as sheets or 30 m coils, suiting both small trims and long continuous runs
- Fully integrated into the Sarnafil G/S single-ply system rather than a generic bolt-on accessory
Limitations & considerations
- The PVC lamination is not resistant to tar, bitumen, oil or solvent-containing materials and must be kept away from them
- It is a system detailing component, not a standalone waterproofing membrane; it must be welded into a Sarnafil roof to perform
- Installation is restricted to Sika-trained and approved contractors experienced in single-ply welding
- Service is limited to locations with average monthly minimums around -30 degC and permanent ambient use up to +50 degC
- Over-tight folds (below the 3x thickness bending radius) or excessive edge pressure can crack or delaminate the PVC skin
- Some ancillary adhesives, cleaners and solvents cannot be used below +5 degC, which affects cold-weather installation
Selection & best practice
Fold the sheet or coil to profile keeping the bending radius at a minimum of three times the flashing thickness, and avoid excessive edge pressure that could damage the lamination. Fix at the minimum fixing distances required by the local roof design, and leave a 3 to 5 mm gap at butt ends to accommodate thermal movement, carrying the membrane weld across the joint. Ensure the PVC face is clean and dry, then hot-air weld it to the surrounding Sarnafil membrane at the correct temperature and speed for a homogeneous seam. Store pallets flat, in dry conditions between +5 and +30 degC, never stacked on one another or under other materials, and keep the product clear of bitumen, oils and solvents at all times. Prime and detail using the matched system products, and let only Sika-trained applicators execute the work.
Specifications
| Composition | Top: Sarnafil G PVC with glass non-woven inlay; Bottom: DX51D Z275 galvanised steel, epoxy-coated cut edge |
| PVC lamination thickness | 1.20 mm |
| Steel thickness | 0.60 mm |
| Total thickness | 1.80 mm |
| Weight | 6.20 kg/m2 (+/-8%) |
| Sheet sizes | 2.00 m x 1.00 m or 3.00 m x 1.00 m |
| Coil size | 30.00 m x 1.00 m |
| Available colours | Light grey, window grey, lead grey, copper patina, copper brown, traffic white |
| Ambient service temperature | -20 degC min / +60 degC max (permanent use limited to +50 degC) |
Industry use cases
Commercial single-ply roofing
Weldable drip edges, verge and fascia trims on Sarnafil PVC roofs over malls, offices and IT parks where a clean, sealant-free perimeter is specified.
Industrial and warehouse roofs
Perimeter fastening details and long gutter linings on large-span sheds, fabricated from 30 m coils to minimise joints.
Parapets and upstands
Coping and capping profiles welded into the field membrane to terminate the waterproofing at raised roof edges and walls.
Rainwater management
Gutter linings and outlet junctions where a homogeneous membrane-to-metal weld prevents leakage at the most vulnerable drainage points.
Bespoke roof details
Workshop-fabricated corner pieces, kerbs and penetration surrounds for complex roof geometries that pre-formed accessories cannot cover.
Frequently asked questions
Is Sarnafil Metal PVC a waterproofing membrane on its own?
Which Sarnafil membranes does it weld to?
What thickness and weight should I expect?
Can it be shaped on site?
What surfaces or materials will damage it?
Who is allowed to install it, and what colours are available?
How we position Sika Sarnafil Metal PVC
Sarnafil Metal PVC is a detailing piece within Sika’s Sarnafil single-ply family, so it is best sold as part of a system rather than in isolation. Pair it with the field membrane it welds into, Sarnafil G 410 or Sarnafil S 327, and with the matched ancillaries the roof design calls for, namely Sarnaplast-2235, Primer-110 and Sika S-Sealing Tape. Where a project needs bonded rather than mechanically fixed details, Sika’s Sarnacol adhesives complete the specification. Because this is a genuinely PVC single-ply component, there is no honest Fosroc equivalent; contractors working in a Fosroc-based waterproofing scope would typically be on a different system entirely (cementitious or liquid-applied), so a cross-sell there would be misleading. For clients weighing single-ply against other approaches, we can also position Sika’s membrane roofing against liquid-applied polyurethane or APP/SBS torch systems from our other brand lines, and advise honestly on which suits the roof, the budget and the maintenance appetite.
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