Repair Systems — Roof & Podium Waterproofing
Single-ply ballasted membrane systems — roofs and podiums
Technical product reference for loose-laid PVC single-ply membranes held by pebble or paver ballast — Wolfin IB, Cosmofin, Fatrafol 810v, and Sarnafil G 410 in ballasted configurations — hot-air welded seams — accredited applicator required.
What are ballasted single-ply membrane systems?
Ballasted single-ply systems loose-lay a factory-made PVC sheet membrane and hold it down with ballast — pavers, gravel, or a green-roof/podium build-up — rather than mechanical fixings or full bonding. They suit inverted (protected-membrane) roofs and podiums where overburden is present. The membranes are the same accredited single-ply products used elsewhere; selection turns on ballast/uplift design, the install method, protection layers, and Class 2 (NCC) test evidence to AS 4654.1.
Class 2 (NCC) — balconies, roofs & podiums: specify only a sheet with current Australian test certification (see the “Class 2 / NCC tested” field on each card). EN 13956 / CE marking is European, not an Australian certification.
Product Reference
Individual products — one card each — scroll to view all
Wolfin / Projex Group
Wolfin IB — Loose-Laid PVC Sheet Membrane
Polyester-PVC single-ply sheet — loose-laid, mechanically fixed
Wolfin IB is a German-engineered polyester-PVC single-ply waterproofing sheet, loose-laid and secured with mechanical fixings, for roofs and podiums. NATA-tested in Australia and compliant to AS 4654.1-2012 and AS 4858. Sole Australian distributor Projex Group; installed only by Projex-accredited applicators, with an inspected single-point warranty of up to 20 years on workmanship and materials.
Cosmofin / Projex Group
Cosmofin FG / FG LL — Reinforced PVC Single-Ply Sheet Membrane
Reinforced flexible PVC single-ply sheet (1.5 mm)
Cosmofin FG / FG LL is a 1.5 mm reinforced flexible PVC single-ply membrane (light grey), engineered in Germany by Wolfin, available with or without fleece backing for bonded, loose-laid, ballasted or mechanically-fixed installation. NATA-tested and compliant to AS 4654.1-2012 and AS 4858. Projex Group sole Australian distributor; accredited applicators only; single-point warranty up to 20 years.
Fatra Australia
Fatrafol 810v — Reinforced PVC Single-Ply Sheet Membrane
Polyester-reinforced PVC single-ply roof sheet (mechanically anchored)
Fatrafol 810v is a reinforced PVC-P single-ply roofing membrane (polyester-mesh reinforced), UV-resistant and mechanically anchored, for exposed flat roofs. Supplied/designed in Australia by Fatra Australia. The page cites EN 13956; confirm the current Australian AS 4654 certification and thickness with Fatra Australia.
Sika Australia
Sika Sarnafil G 410 — PVC Single-Ply Sheet Membrane
Multi-layer PVC single-ply roof sheet (hot-air weldable)
Sika Sarnafil G 410 is a multi-layer synthetic PVC roof waterproofing sheet with a glass non-woven inlay, hot-air weldable and UV-stabilised for direct exposure, available 1.5 mm (G 410-15 L) and 2.0 mm (G 410-20 L). The AU page cites EN 13956 / GB 12952; confirm the current Australian AS 4654 certification and accredited applicator with Sika Australia.
System Comparison
Ballasted single-ply membrane systems — confirm all selections against the current manufacturer TDS before specifying.
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ACCREDITED APPLICATOR REQUIRED FOR ALL PRODUCTS ON THIS PAGE — DO NOT SPECIFY WITHOUT CONFIRMING AVAILABILITY
Every single-ply ballasted membrane system on this page requires installation by a manufacturer-accredited specialist applicator with calibrated hot-air welding equipment, manufacturer training, and verified system installation experience. Projex Group (Wolfin, Cosmofin), Fatra Australia (Fatrafol), and Sika (Sarnafil) all mandate accredited installation as a condition of the system warranty. An incorrectly welded seam — wrong temperature, speed, or pressure — will appear continuous but will fail under hydrostatic pressure and thermal cycling. Accredited applicators are not available in all locations in Australia. Confirm accredited applicator availability in the project location before including any of these products in a project specification. Do not specify a product if an accredited applicator cannot be confirmed.
ALL SEAMS MUST BE TESTED AND CONFIRMED BEFORE BALLAST IS PLACED — SEAMS CANNOT BE ACCESSED AFTER BALLASTING
Once pebble or paver ballast is placed over the membrane, the membrane surface and all hot-air welded seams are permanently inaccessible without full ballast removal — a major cost and programme disruption on an occupied strata building. All seams must be tested using point probe or air lance methods immediately after welding, before any ballast is placed. Every failed seam must be repaired and re-tested before the ballasting sequence continues. The accredited applicator must document all seam test results as part of the project quality record before the installation is signed off and covered. This is a mandatory hold point — not an optional QA step.
BALLAST MATERIALS, WEIGHTS, AND ZONE REQUIREMENTS ARE ON THE BALLAST SYSTEMS PAGE — NOT THIS PAGE
This page covers the membrane products used in single-ply ballasted systems. The ballast materials — washed river pebble and precast concrete pavers — including minimum weights, depth requirements, zone design (field, perimeter, and corner), wind uplift analysis requirements, and structural loading confirmation, are covered on the Ballast Systems page. Both pages must be consulted together when specifying a single-ply ballasted roof or podium system. The membrane and the ballast are separate specifications — neither is complete without the other.
ARDEX WPM 715 IS NOT A BALLASTED MEMBRANE — IT IS AN EXPOSED UV-RESISTANT SINGLE-PLY MEMBRANE
ARDEX WPM 715 (Weldtec) is an exposed, UV-resistant, heat-weldable single-ply membrane designed for roofs and decks where the membrane is left exposed to UV and the elements. ARDEX does not publish a ballasted system specification for WPM 715. Ballasting WPM 715 would cover a membrane that is specifically designed and warranted for exposed use. If WPM 715 is being considered for a project, it should be specified as an exposed membrane — not in a ballasted configuration. For ballasted single-ply systems, specify one of the four products on this page. For exposed single-ply membrane applications, refer to the HDPE Sheet Membranes (roofs/podiums) page or confirm with ARDEX Australia whether WPM 715 has a separate page on this site.
Disclaimer
This page provides general technical information only. Final product selection must be confirmed against the current manufacturer technical data sheet, project specification, substrate condition, wind uplift analysis per AS/NZS 1170.2, structural engineer confirmation of slab dead load capacity, AS 4654.1 compliance requirements, NCC requirements, and accredited applicator availability. All hot-air welded seams must be tested before ballast is placed. Ballast materials, weights, and zone requirements are covered on the Ballast Systems page — both pages must be consulted together when specifying a single-ply ballasted system. Do not rely on this reference as a substitute for professional waterproofing consultant or structural engineer advice.