Torch-On Roofing Services

What Is Torch-On Roofing?

Torch-on roofing is a well-established flat roofing method that uses modified bitumen membranes bonded to the roof substrate using controlled heat from a gas torch. As the underside of the membrane is heated, the bitumen melts and fuses directly to the surface beneath, creating an exceptionally strong, fully bonded waterproof layer. This heat-welding process produces a seal that is far superior to traditional cold-adhesive or mechanically fixed methods, which is why torch-on systems have been the go-to choice for flat roofing professionals for decades.

At Henleys Roofing Ltd, our roofers are highly trained and experienced in torch-on application. We understand the precise temperatures and techniques required to achieve a perfect bond without damaging the membrane or the underlying structure. This level of skill is critical – torch-on roofing is only as good as the tradesperson installing it, and our track record of over 14 years speaks for itself.

Modified Bitumen Membrane Systems

Modern torch-on roofing uses modified bitumen membranes that are engineered to deliver performance far beyond that of traditional roofing felt. These membranes are reinforced with polyester or glass fibre and modified with either APP (Atactic Polypropylene) or SBS (Styrene-Butadiene-Styrene) polymers, each offering distinct advantages:

• APP-Modified Membranes – Offer excellent UV resistance and are highly suited to exposed applications where the membrane serves as the finished surface. APP membranes have a higher melting point, making them ideal for warmer climates and south-facing roofs.
• SBS-Modified Membranes – Feature superior flexibility and elongation, allowing them to accommodate structural movement and thermal cycling without cracking. SBS membranes perform exceptionally well in colder temperatures.
• Multi-Layer Systems – For enhanced durability and redundancy, we regularly install two- and three-layer torch-on systems. Multiple layers provide additional waterproofing protection and significantly extend the overall lifespan of the roof.
• Mineral-Finished Cap Sheets – The top layer of a torch-on system is typically a mineral-surfaced cap sheet that provides UV protection, improved aesthetics and additional weather resistance.

Suitable for Commercial & Domestic Properties

Torch-on roofing is one of the most versatile flat roofing methods available and is suitable for a wide range of property types. On the domestic side, we regularly install torch-on systems on house extensions, garages, porches and dormers. Homeowners appreciate the proven reliability and the clean, professional finish that a well-installed torch-on roof provides.

For commercial properties, torch-on roofing is particularly well suited to larger roof areas where its speed of installation and long-term durability offer real value. We have completed torch-on installations on offices, warehouses, retail units, schools and multi-occupancy residential buildings. Our team can work to detailed specifications and provide full method statements, risk assessments and hot works permits as required for commercial contracts.

Why Choose Torch-On Roofing?

There are many flat roofing systems to choose from, but torch-on remains one of the most popular for good reason. The key benefits of choosing a torch-on system from Henleys Roofing Ltd include:

• A fully bonded membrane with no gaps, seams or weak points
• Outstanding resistance to wind uplift, standing water and driving rain
• Proven long-term performance with a typical lifespan of 20 to 30 years
• Multi-layer options for enhanced durability on high-use or exposed roofs
• Compatible with a range of insulation boards for improved thermal performance
• Straightforward maintenance and repair if ever needed
• Cost-effective solution for both new installations and replacements

Our team will always carry out a thorough assessment of your existing roof before recommending a torch-on system. We check the condition of the deck, the adequacy of falls for drainage, the state of any existing insulation and the condition of upstands, outlets and detailing. This ensures that your new torch-on roof is installed on a sound base and performs exactly as it should for the full extent of its guaranteed life.