Single-ply sheet membrane systems — roofs and podiums

Wolfin IB is a single-ply, fully homogeneous, polyester-reinforced PVC waterproofing sheet membrane manufactured in Germany and distributed in Australia by Projex Group. First introduced in 1963 and in use across Australia since the late 1980s, Wolfin is one of the most established single-ply sheet membrane systems in the Australian roof and podium waterproofing market with millions of square metres installed across all Australian climatic zones.

Wolfin IB is installed loose-laid over the prepared substrate — the membrane is unrolled without bonding or mechanical fixing to the substrate, adjacent rolls are overlapped, and the laps are hot-air welded to form continuous watertight seams. Ballast (gravel, concrete pavers, or growing medium) is placed above the membrane to resist wind uplift. For applications where loose-laid is not appropriate, the Wolfin GWSK self-adhesive bonded variant is used.

Wolfin is UV stable, root resistant, and chemically resistant — suitable for exposed roof decks, ballasted roofs, green roofs, podium slabs, and planter box applications. The polyester reinforcement provides dimensional stability and resistance to mechanical damage. Wolfinsteel perimeter profiles (galvanised or 316L stainless) are used for perimeter termination — all fixings are encapsulated within the profile and welded to the membrane, eliminating exposed mechanical fixings through the membrane field. Installation is by Projex Group-accredited applicators only — every Wolfin installation is inspected and signed off by Projex Group, resulting in a single-point warranty on both workmanship and materials for up to 15 years.

Wolfin GWSK is the self-adhesive bonded variant of the Wolfin system — a high-polymer PVC sheet membrane with an integrated special glass fleece and cold-bonding self-adhesive layer on the underside, manufactured by extrusion. The self-adhesive layer allows the membrane to be bonded directly to the substrate or over an existing membrane without separate adhesive application, simplifying installation on podium slabs and roof decks where a fully bonded system is required to prevent lateral water migration under the membrane.

In remediation projects on Class 2 strata podium slabs, Wolfin GWSK is specified where the existing membrane cannot be fully removed and the new membrane is to be installed directly over the existing system — the self-adhesive layer bonds to the existing surface and the hot-air welded seams create a watertight continuous sheet. It is bitumen-compatible — the self-adhesive layer bonds to bituminous substrates, making it suitable for installation over existing torch-on modified bitumen sheet membranes.

Installation is by Projex Group-accredited applicators only, with the same warranty and inspection regime as Wolfin IB — every installation is inspected and signed off by Projex Group, resulting in a single-point warranty on both workmanship and materials.

Cosmofin is a reinforced, high-quality flexible PVC single-ply sheet membrane engineered in Germany by Wolfin Membranes and distributed in Australia by Projex Group. Cosmofin is supplied as a complete system incorporating all ancillary components — pre-made corner pieces, drain outlets, and accessory components — factory-manufactured from the same PVC compound as the membrane to ensure total material compatibility.

Cosmofin is available in two variants: Cosmofin FG (standard grade) compliant with AS 4654.1:2012, and Cosmofin FG LL which also complies with AS 4858 for internal and wet area applications. This makes Cosmofin FG LL suitable for both external podium and roof deck applications and under-tile balcony applications in Australian strata projects where a single-ply sheet membrane is specified under the tile system. Both variants are NATA certified.

Roll size is 1.65m wide × 15m long, 2mm thick including the fleece backing. The fleece backing provides a bonding surface for tile adhesive when Cosmofin is used as an under-tile membrane on balconies. Cosmofin is hot-air welded at seams. Corners and junctions are hot-air welded directly to the Cosmofin field membrane using pre-made factory corner pieces — not site-formed in liquid membrane.

Sika Sarnafil G 410 is a multi-layer PVC single-ply sheet membrane with a glass non-woven inlay, manufactured for direct exposure applications on flat roofs, ballasted roofs, green roofs, and podium slabs. The glass non-woven inlay provides dimensional stability — Sarnafil G 410 is UV stable and contains UV light stabilisers in the PVC compound. Hot-air welded at seams and laps. Available in multiple thicknesses — 1.5mm and 2.0mm — and in a range of colours.

Sika Sarnafil G 410 is part of the Sika roofing system and is specified in conjunction with Sika insulation, vapour barriers, and accessories as a complete engineered roof and podium system. In Australian strata remediation, Sarnafil G 410 is used on communal roof decks, large podium slabs, and large terrace areas where a PVC single-ply system is specified and a Sika-accredited applicator is available.

Sarnafil G 410 can be installed loose-laid with ballast, mechanically fixed, or fully bonded depending on the substrate and project requirements. Compatible with green roof and ballasted podium applications. Must be separated from bitumen and bituminous surfaces — confirm separation layer requirements with Sika technical.

Tremco Paraseal LG is a multi-layer sheet membrane system consisting of a self-sealing, expandable layer of sodium bentonite clay laminated to an impermeable HDPE sheet. When exposed to water, the bentonite layer swells to create a self-sealing waterproof barrier — minor punctures or pinholes in the membrane are self-sealed by the swelling bentonite. Paraseal LG is the primary HDPE-bentonite product in the Australian waterproofing market.

Paraseal LG is included on this page as the primary true HDPE sheet membrane product used in Australian strata remediation — but its application scope is fundamentally different from PVC and FPO/TPO single-ply sheet membranes. Paraseal LG is specified for below-grade waterproofing — below-slab horizontal applications (pre-applied before concrete pour), subsoil retaining wall waterproofing, and basement below-grade applications. It is not designed for exposed roof deck, podium surface, or balcony applications where UV exposure, foot traffic, and drainage above the membrane are the primary conditions.

This card is included to clearly distinguish HDPE-bentonite systems from the PVC and FPO/TPO single-ply systems that are the primary products for roof and podium remediation on Class 2 strata. Do not specify Paraseal LG or similar HDPE-bentonite products for exposed podium or roof deck applications without confirming with Tremco technical that the product is appropriate for the specific application conditions.