In the roofing industry, there are different application methods that can be used. One option is the Torch-On method, which we will look at in this article.

In this article, we will discuss:

• What is Torch-On roofing?
• Which modified bitumen is used for Torch-On roofing?
• Where can I find Torch-On roofing felts?

What Is Torch-On Roofing and Why Is It So Widely Used?

Torch-on roofing is where an open-flame torch is used to bond layers of reinforced bitumen membrane. Torch-on roofing has been a reliable choice in the industry for years.  It is popular because it is durable, provides efficient waterproofing, and has a simple installation process. This system is suitable for flat roofs on residential and commercial buildings.

What Type of Modified Bitumen Is Used?

For torch-on applications, the most common and reliable option is SBS (Styrene Butadiene Styrene) modified bitumen.

SBS is a rubber-modified bitumen that gives the membrane excellent low temperature flexibility. This flexibility allows the system to cope with roofs expanding and contracting throughout the year.

Because of its elastic properties, SBS modified membranes return to shape when stressed, which makes the roofing system more resilient.

In the UK, SBS modified bitumen is the most requested specification for torch-on roofing systems.

Why Choose a Torch-On Roofing System?

The benefits of Torch-On Roofing:

• Excellent waterproofing
• Cost-effective, as it can last for many years
• Simple installation, even in unstable weather conditions

These membranes can be manufactured with glass fibre or polyester reinforcement for added strength, or with aluminium foil (to be used as an effective air and vapour control layer in warm roof construction). They are also available in underlay forms for built-up systems and in mineral-finished cap sheets.

Where Can Torch-On Roofing Be Used?

Torch-on systems can be safely applied to non-combustible substrates, including metal and concrete decks, which means they are suitable for a wide range of projects – small domestic roofs or large commercial installations.

However, because the system relies on an open flame, torch-on membranes should not be used on timber structures or other combustible surfaces. Installers should always follow safe working practices and compliance on site.

Where can I find Torch-On and SBS Modified Bitumen roofing felts?

At Wonderbuilds, we offer a range of torch-on roofing felts that have SBS modified bitumen, including capsheets, underlays, and specialist membranes.

Underlays

Please see below some of the products we have in our range of torch-on underlays:

• 3kg Sanded Underlay
• 4kg Sanded Underlay
• 3kg Film/Film Underlay
• 4kg Film/Film Underlay

Capsheets

Please see below some of the products we have in our range of torch-on capsheets:

• 5kg Black Capsheet
• Technoelast K-PS 170/5000

Specialist membranes

Please see below some of the products we have in our range of torch-on specialist membranes:

• Part Bonded Torch-On Underlay
• Premium 5kg Capsheet

FAQs

• Why is torch-on roofing a popular method?

It has a simple installation process, provides excellent waterproofing, and is durable.

• What type of modified bitumen is sometimes used?

SBS modified bitumen is widely used in the UK.

• Where can I find torch-on roofing felts in the UK?

At Wonderbuilds, we offer a range of torch-on/SBS roofing felts. You can contact us at admin@wonderbuilds.co.uk for more information and quotes.

Quick Summary

Torch-on roofing method is widely used in the roofing industry, especially in the UK, due to the simple application process and how efficient and durable the products are.