Fosroc Proofex Torchseal 4S 250, Torch-Applied Waterproofing Membrane for Roof & Basement

Fosroc Proofex Torchseal 4S 250 is a self-adhesive waterproofing membrane designed for roofs. It can be used on both flat and pitched roofs, and it is reinforced with a polyester mat to provide added strength and durability. The membrane bonds to the roof surface using a bitumen-based adhesive and can be installed with a torch or hot air gun for activation.

Key features include a polyethylene film backing coated with bitumen-based adhesive, reinforcement with a polyester mat, self-adhesive bonding, UV resistance for long-term exposure, and compatibility with torch or hot air activation. It is suitable for both hot and cold climates and offers chemical resistance for industrial and commercial applications.

Yes. Torchseal 4S 250 is designed for use on both flat and pitched roofs, providing a watertight seal across varying roof geometries.

Typical installation involves preparing a clean, dry roof surface, unrolling the membrane, aligning it with the roof edges, and bonding it to the substrate by activating the bitumen adhesive with a torch or hot air. Overlaps should be properly pressed to ensure a continuous seal, and joints should be carefully heat-activated to create a watertight bond.

Prepare a clean, dry, and smooth roof surface free from dust, oils, and loose materials. Surface imperfections should be repaired prior to application to ensure proper adhesion and an even seal.

Use appropriate PPE (gloves, eye protection, and flame-resistant clothing). Exercise caution when working with torches to avoid fire hazards, ensure good ventilation where heat is applied, and keep flammable materials away from the work area. Follow site safety protocols for handling heat-applied membranes.

It is well-suited for roof waterproofing in commercial, industrial, and residential applications where a robust, torch-applied or heat-activated membrane is desired for long-term watertight performance on flat or pitched roofs.

Maintenace is generally minimal. Surfaces can be cleaned with mild detergent and water if needed. Avoid harsh detergents or abrasive cleaning that could damage the membrane surface.

Fepy lists multiple Fosroc Torchseal variants. Related options include Torchseal 4S 150 and Torchseal 4S 300, offering different thicknesses or roll dimensions for varying project needs. Product pages: Torchseal 4S 150: https://fepy.com/product/fosroc-proofex-torchseal-4s-150 and Torchseal 4S 300: https://fepy.com/product/fosroc-proofex-torchseal-4s-300. This helps you choose the right membrane based on project requirements and budget.

Choose based on roof requirements (thickness, strength, and projected exposure), roll size availability, and budget. For higher exposure or thicker membranes, alternative Torchseal variants may be more appropriate, while lighter applications may suit thinner versions. Check project specifics and compare the available Torchseal options on Fepy to select the best fit.

Torchseal membranes are typically supplied in rolls with standard widths and lengths. Coverage depends on the roof area and waste factors. Exact roll dimensions for Torchseal 4S 250 are listed on its product page, and you can compare with other Torchseal variants on Fepy to plan material quantities accordingly.

The polyester mat reinforcement increases tear and dimensional stability, helping the membrane resist punctures and movement over time. This reinforcement contributes to longer-lasting waterproofing performance, especially on roofs with movement or temperature fluctuations.