Modified bitumen membrane systems — torch-applied for a fully bonded, monolithic waterproofing layer with exceptional durability on flat and low-slope surfaces.
Torch-on is one of the most proven membrane systems in New Zealand — a heat-applied bitumen layer that bonds fully to the substrate, eliminating the risk of moisture migration under the membrane.
Torch-on membrane is a modified bitumen waterproofing system applied using an open flame torch. The heat melts the underside of the membrane, bonding it directly to the primed substrate and creating a seamless, monolithic waterproofing layer with no air pockets or voids.
The modification of standard bitumen with SBS (Styrene Butadiene Styrene) polymers gives the membrane elasticity, improved low-temperature flexibility, and significantly better UV and fatigue resistance than standard bitumen products.
System advantages
The torch-application process melts the bitumen directly onto the primed substrate — creating a bond with no air gap. This eliminates the risk of water tracking laterally under the membrane from a single puncture point.
SBS polymer modification transforms standard bitumen from a brittle material to an elastic one — better fatigue resistance under thermal cycling, better low-temperature flexibility, and a longer service life overall.
Torch-on bitumen systems have been installed on New Zealand roofs for decades. The performance in Auckland's UV and rainfall conditions is well documented — and replacement cycles are well understood.
Applications
The most common application — torch-on is the benchmark membrane for residential and commercial flat roofing across Auckland.
Fully bonded to concrete substrates — performs well under foot traffic with the correct cap sheet specification and surface protection.
Torch-on is a primary choice for re-roofing projects — the system is well understood and installation quality can be verified through the torching process itself.
Our work
FAQ
SBS-modified torch-on membrane systems are designed for a 20–30 year service life when correctly installed on a properly prepared substrate. The quality of the torching process and seam overlaps are the primary determinants of longevity.
Yes. Torch-on installation is standard practice on occupied residential and commercial buildings across Auckland. We take appropriate precautions with the flame application and ensure adequate ventilation. The process is well-regulated and routinely performed safely.
In some cases, yes — particularly over existing torch-on or felt-based systems in sound condition. This depends on the existing membrane type, condition, and substrate. We assess this at the site visit and will only recommend overlay if it provides a genuine long-term solution.
Nuralite is a brand of torch-applied modified bitumen membrane manufactured in New Zealand. It is a torch-on membrane — one of the most well-known and widely used systems in the NZ market. AquaProof is a Nuralite approved applicator.
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