What Specialist Membranes can be used in roofing systems?

  • by Dina Vaisman
  • June 12, 2026
  • Roofing Articles

Wonderbuilds offers a range of Specialist Membranes, including bitumen capsheets and bitumen underlays. Some of them have convenient application processes as they have a self-adhesive layer, such as the Self-Adhesive Capsheet. Some of the membranes provide effective vapour dispersion for buildings that are prone to damp and mould.

In this article, we will discuss:

Part Bonded Torch On Underlay

Part Bonded Torch On Underlay is a venting bitumen felt. It has been designed to be used in high-performance BUR systems. It can be used for both new build and remedial roofing projects. It is a great choice for buildings that have a high risk of condensation. The low temperature flexibility is at -15OC.

Premium Vapour Barrier

Premium Vapour Barrier is an effective vapour control layer. It is saturated with high quality SBS modified bitumen and is reinforced with aluminium foil and glass fibre. It has high puncture resistance and has excellent low temperature flexibility at -10 OC. It is 10M in length and 4kg per square metre.

View Wonderbuilds Premium Vapour Barrier

Self-Adhesive Capsheet and Underlay

Self-Adhesive Capsheet and Self-Adhesive Underlay have an easy to peel removable film, for convenient installation. This eliminates the need for Hot Works permits, as it is a flame free application process. The capsheet has excellent low temperature flexibility at -20 OC, and the underlay has low temperature flexibility at -15OC.

Self-Adhesive VCL

Self-Adhesive Vapour Control Layer is ideal to use in buildings that have a high risk of condensation. The top surface is covered with aluminium foil, and the bottom surface has an easily removable siliconised film, for convenient application. This VCL is a tough, mechanically resistant membrane. This product must be used in conjunction with Wonderbuilds SA Primer.

Single Layer Overlay

Wonderbuilds Single Layer Overlay uses graphite technology to actively prevent spread of flames on a roof. The low temperature flexibility is excellent at -25 OC. There are various methods of application to choose from: torch-applied, hot air welded, or membrane adhesive bonded. It can be applied to Mastic Asphalt or a BUR System. This product has a 20 year guarantee and is cost-effective.

Torch On Perforated

Torch On Perforated can be applied to a wide range of substrates. It is perfect as the preparation/ventilated layer in a torch on roofing system. It has excellent glass-fibre reinforcement.

Quick Summary

Wonderbuilds has a range of Specialist Membranes available to order, including self-adhesive products and products that provide vapour dispersion.

FAQs

Which products have a convenient flame-free application and a self-adhesive layer?

  • Self-Adhesive Capsheet, Self-adhesive Underlay, and Self-Adhesive Vapour Control Layer.

Can specialist membranes be used for both remedial and new-build projects?

  • Yes, most of the membranes can be used for both.

Which product can be applied in 3 different ways?

  • Single Layer Overlay.

Who can I contact to discuss the specialist membranes and find out further information?

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