Single-ply ballasted membrane systems — roofs and podiums

Wolfin IB is Projex Group's primary loose-laid ballasted single-ply PVC membrane for roof decks, podium slabs, large terraces, and green roofs in the Australian market. The polyester-reinforced PVC membrane is manufactured in Germany and has been installed across Australia since the late 1980s — a documented track record of performance in all Australian climatic zones including coastal, tropical, and alpine environments. In the ballasted configuration, Wolfin IB is unrolled loose-laid over the prepared substrate. Adjacent rolls are overlapped and hot-air welded at seams. Wolfinsteel galvanised or 316L stainless steel perimeter profiles are fixed to the substrate at all edges and upstands — the membrane is welded to the Wolfinsteel face, encapsulating all fixings within the profile body with no exposed fasteners through the membrane field. Pebble or paver ballast is placed in the field area after seam testing — the Wolfinsteel profiles provide mechanical restraint at the perimeter and corner zones where wind uplift forces are highest. Wolfin IB is FLL certified for root penetration resistance — the same membrane is used on green roofs and planter boxes where root resistance is required. Confirmed AS 4654.1:2012 compliant. NATA certified. Every Wolfin installation is inspected by Projex Group and backed by a single-point warranty on workmanship and materials for up to 15 years issued to the building owner.

Cosmofin FG is Projex Group's reinforced PVC single-ply membrane that can be used in loose-laid ballasted configurations on roof decks and podium slabs, and also in bonded configurations where a fleece-backed membrane is required for tile adhesive bonding in under-tile applications. This dual capability makes Cosmofin FG particularly useful on projects that combine a ballasted membrane zone over the main podium slab with a tiled zone at threshold areas or podium edges — a single membrane product covers both areas. Cosmofin is manufactured in Germany by Wolfin Membranes. The system includes factory pre-made corner pieces and drain outlets in the same PVC compound as the membrane, ensuring full material compatibility at the critical junction details. Roll size 1.65m × 15m, 2mm thick including fleece. The PVC compound is FLL certified for root penetration resistance. Two variants: Cosmofin FG (AS 4654.1:2012 compliant) and Cosmofin FG LL (also AS 4858 compliant for internal and wet area applications). NATA certified. In the ballasted configuration, Cosmofin FG is loose-laid, hot-air welded at seams, and held by pebble or paver ballast in the field area with Wolfinsteel profiles at all perimeters. Confirm which variant (FG or FG LL) is required for the specific application standard before specifying.

Fatrafol 810v is Fatra Australia's reinforced PVC single-ply membrane for loose-laid ballasted roof deck and podium slab applications. Confirmed at fatraaustralia.com.au for concrete uninsulated ballasted and insulated ballasted configurations. In the ballasted system, Fatrafol 810v is loose-laid on the prepared concrete substrate with adjacent rolls hot-air welded at seams. Ballast — pebble, concrete pavers, or adjustable pedestals with pavers — is placed above the membrane after seam testing. Fatra Australia offers two ballasted system configurations for the Fatrafol 810v: uninsulated ballasted (membrane directly on concrete slab — ballast above membrane) and insulated ballasted as an inverted roof (membrane on concrete slab — XPS insulation above membrane — ballast above insulation). See the Tapered Insulation page for the insulated configuration. Fatra Australia provides comprehensive project documentation — CAD detail drawings, WORD specification templates, technical data sheets, maintenance guides, and certification are all available through fatraaustralia.com.au. This documentation package is a significant advantage for specifiers who need to integrate the product into a formal project specification. Fatra Australia also offers 20-year and 30-year manufacturer-backed warranties, described as Australia's only 30-year manufacturer warranty on an insulated waterproofing system.

Sika Sarnafil G 410 is a multi-layer PVC single-ply membrane with a glass non-woven inlay specifically designed for gravel-ballasted roof deck, podium slab, and green roof applications. The glass non-woven inlay provides dimensional stability. In the ballasted configuration, Sarnafil G 410 is loose-laid on the prepared substrate — on insulation in a warm roof build-up, or directly on the structural slab in an uninsulated configuration — and held in place by gravel ballast placed above the membrane. Sika specifies a minimum gravel layer depth of 50mm and a minimum ballast weight of 80 kg/m² in field zones for the Sarnafil gravel-ballasted system. Sarnafil G 410 is UV stable and resistant to biological microorganisms. It can be used as the waterproofing layer in green roof assemblies where growing medium, drainage cells, and filter fabric are placed above the ballast layer. It is part of the Sika complete roofing system, which includes compatible Sika insulation, vapour control layers, and perimeter accessories. Sika has a confirmed Australian presence through aus.sika.com — however, Sarnafil G 410 in its ballasted configuration is a specialist roofing system product. Confirm with Sika Australia directly that the product is currently available, that accredited applicators are accessible in the project location, and that the complete Sika ballasted roofing system specification is supported by Sika Australia technical before specifying.