The Torch-On Felt 2mm Underlay 16m is a high-performance, lightweight base layer designed specifically for multi-layer flat roofing systems on garages, sheds, extensions, and outbuildings. Measuring 16 meters in length with a slim 2mm profile, this underlay provides an essential first stage of defense in torch-on felt applications. Its flexible, high-tensile core ensures it conforms smoothly to roof decks and accommodates minor structural movements without cracking or tearing.
 
Engineered for efficient installation, the underside of the membrane features a specialized melt-off film that burns away quickly under a roofing torch, creating a secure, uniform bond with the substrate. The upper surface is finished to accept the final cap sheet seamlessly, ensuring maximum adhesion between layers. This creates a robust, multi-layered barrier that enhances the overall stability and wind-uplift resistance of the entire roofing structure.
 
Working in tandem with a heavy-duty mineral cap sheet, this 2mm underlay plays a critical role in preventing moisture ingress and protecting underlying timbers from dampness and leaks. It delivers reliable, trade-quality performance that extends the lifespan of flat roofs while providing a stable foundation for the final protective layer. Whether used for a new installation or a complete roof refurbishment, this underlay is a dependable choice for professional-grade weatherproofing.