Repair Systems — Sheet Membranes
Hot melt rubberised asphalt systems — roofs and podiums
Technical product reference for hot-fluid-applied rubberised asphalt waterproofing systems. Covers system principles, inverted roof assembly, specialist equipment and applicator requirements, Australian market availability, and brand comparisons for podium slab, roof deck, and plaza deck applications.
What are hot-melt rubberised-asphalt systems?
Hot-melt rubberised-asphalt (and traditional mastic-asphalt) systems are monolithic, hot-applied, fully-bonded waterproofing membranes — melted in a kettle and applied with reinforcing fabric and protection layers. Because they bond fully and have no joints, they are favoured under heavy overburden on plaza/podium decks, inverted (protected-membrane) roofs, green roofs, planters and below-grade. They are specialist, protected (covered) systems — not exposed finishes. Several products here are imported or specialist; confirm current Australian availability and the protected build-up.
Class 2 (NCC) — podium & deck systems: confirm the specific product's current Australian test evidence (see the “Class 2 / NCC tested” field). EN / BBA / North-American certifications are not Australian certifications.
Product Reference
Individual products — one card each — scroll to view all
Henry Company
Henry 790-11 Hot Rubberised Asphalt
Hot-applied rubberised-asphalt monolithic membrane
Henry 790-11 is a hot-applied rubberised-asphalt waterproofing membrane (refined asphalts, synthetic rubber and mineral stabilisers) that applies as a monolithic, joint-free, fully-bonded membrane with reinforcing fabric, for plaza/podium/parking decks, planters, tunnels, reflective pools and protected-membrane roofs. Widely used in North America; confirm current Australian availability and distributor before specifying.
Soprema
Soprema Colphene H
Hot-applied rubberised-asphalt membrane (+ reinforcing fabric)
Soprema Colphene H is a hot-applied rubberised-asphalt waterproofing membrane reinforced with mineral fillers, used with a reinforcing fabric on horizontal and vertical surfaces of protected-membrane (inverted) roofs, green roofs, plaza decks, foundation walls and other below-grade applications. Available in Australia through Soprema distributors (e.g. Bayset — Colphene BSW-H); confirm the exact current product and TDS.
Sika Australia
SikaShield Hot Melt 50/70
Hot-applied polymer-modified bitumen structural waterproofing
SikaShield Hot Melt 50/70 is a hot-applied (165–185 °C) polymer-modified bitumen / synthetic-rubber waterproofing compound applied with reinforcement and protection layers as part of the SikaShield Hot Melt structural waterproofing system, for ballasted roofs, podium decks, balconies and terraces. UK BBA-certified; confirm current Australian availability and certification with Sika Australia.
Mastic asphalt (traditional)
Mastic Asphalt — Hot-Applied Bituminous System
Traditional hot-applied mastic-asphalt waterproofing
Mastic asphalt is a traditional hot-applied bituminous waterproofing and surfacing system (bitumen with graded mineral aggregate) laid in layers by specialist contractors, used on podium/plaza decks, tanking and heavy-duty trafficable build-ups. Confirm the specialist contractor and current specification (Mastic Asphalt Council of Australia) for the project.
System Comparison
Hot-melt rubberised-asphalt systems — confirm all selections against the current manufacturer TDS before specifying.
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CONFIRM AUSTRALIAN PRODUCT AVAILABILITY AND SPECIALIST APPLICATOR ACCESS BEFORE SPECIFYING ANY HOT MELT SYSTEM
Hot melt rubberised asphalt systems are an established waterproofing technology in the UK and North American markets, but have limited confirmed distributor presence and specialist applicator networks in Australia. The principal international products — Henry 790-11, Soprema Colphene H, and SikaShield Hot Melt — may not be currently stocked, distributed, or supported by specialist applicators in the project location. Specifying a product that cannot be sourced or installed by an available specialist applicator in Australia will delay the project and may result in an alternative product substitution that is not equivalent. Confirm product availability, distributor access, and specialist applicator availability in writing with each manufacturer before including any hot melt rubberised asphalt product in a project specification.
HOT MELT APPLICATION REQUIRES SPECIALIST THERMOSTATICALLY CONTROLLED MELTING EQUIPMENT — NOT STANDARD ROOFING PLANT
Hot melt rubberised asphalt must be heated in a mechanically agitated, thermostatically controlled melting cooker capable of maintaining a precise temperature range — typically 165°C to 185°C. Standard roofing torches, open flame kettles, and general heating equipment are not appropriate for hot melt rubberised asphalt application. Overheating above the maximum application temperature (typically 220°C) degrades the rubber polymer and permanently reduces membrane performance — overheated material must be discarded. Underheating produces a material that is too viscous to flow and bond correctly to the substrate. The melting cooker must be confirmed as available and in calibrated working order before the application programme is committed. Additionally, the structural loading of the melting kettle on the roof or podium deck must be confirmed with the structural engineer before plant is placed.
MASTIC ASPHALT IS NOT THE SAME PRODUCT AS MODERN RUBBERISED ASPHALT — DO NOT SPECIFY AS EQUIVALENT
Mastic asphalt and hot melt rubberised asphalt are related but distinct bituminous products. Mastic asphalt is a traditional hand-applied system using bitumen, limestone aggregate, and mineral filler, applied at 200°C+ to a typical total thickness of 20mm or more by specialist mastic asphalt screeders. Modern rubberised asphalt (Henry 790-11, Soprema Colphene H) is a rubber-polymer-modified system poured at lower temperatures to a thinner total thickness of 5–6mm. They have different mechanical properties, different application methods, different weights, and different structural loading implications. When specifying remediation of an existing mastic asphalt system, confirm with the waterproofing consultant whether new mastic asphalt, a compatible liquid-applied membrane, or a sheet membrane system is the correct remediation approach — do not assume they are interchangeable.
HOT MELT RUBBERISED ASPHALT IS AN INVERTED ROOF (PROTECTED MEMBRANE) SYSTEM — THE MEMBRANE IS NEVER EXPOSED
Hot melt rubberised asphalt is applied directly to the structural slab and immediately covered by a protection course, then insulation (XPS board), then drainage layer and filter fabric, then ballast, pavers, or growing medium. The cured membrane is never left exposed to UV, foot traffic, or the elements — it is permanently buried under the system build-up. This is the inverted (protected membrane) roof assembly. The hot melt membrane is not suitable for exposed applications and should not be specified as an exposed surface finish. If an exposed podium or roof deck finish is required, specify a PVC or FPO single-ply sheet membrane (see the Single-Ply Sheet Membranes page) or a liquid-applied PU membrane instead.
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, structural loading capacity, drainage design, NCC requirements, and waterproofing consultant advice. Hot melt rubberised asphalt installation requires specialist thermostatically controlled melting equipment and specialist applicators — confirm Australian product availability, distributor access, and accredited applicator availability before specifying. Structural engineer confirmation of roof or podium slab loading capacity for melting plant is mandatory before application. Do not rely on this reference as a substitute for professional waterproofing consultant or structural engineer advice.