£57.99
In stock
9959 in stock
Create a strong, durable and professional flat roofing system with SupaTec SBS Torch-On Polyester Sand Finish Underlay, a heavy duty 4mm SBS modified bitumen roofing felt designed for use within built-up felt roofing systems.
Supplied in a convenient 7.5m x 1m roll, this professional-quality torch-on felt combines a tough polyester reinforcement with SBS modified bitumen to provide excellent strength, flexibility and waterproofing performance.
Finished with fine sand on the upper surface and plastic foil to the underside, SupaTec is suitable for use as a cap sheet, top sheet or roofing underlay, depending on the specification of the roofing system.
At approximately 4mm thick, this SupaTec membrane provides a substantial roofing layer suitable for demanding flat roofing applications.
Its tough polyester base offers excellent strength and resistance to tearing, while the SBS modified bitumen provides the flexibility required for professional roofing installations.
For customers searching for 4mm torch-on roofing felt, polyester roofing underlay, SBS torch-on felt or sand finish roofing felt, SupaTec provides a high-quality and versatile solution.
One of the main advantages of this SupaTec roofing felt is its polyester reinforced base.
Polyester provides excellent tensile strength and tear resistance, making the membrane particularly suitable for professional roofing projects where a strong and dependable waterproof layer is required.
Its reinforced construction makes it a significant upgrade from lighter traditional roofing felts and provides a solid foundation for a long-lasting built-up roofing system.
SupaTec uses SBS (Styrene-Butadiene-Styrene) modified bitumen, which improves the flexibility and performance of the membrane.
SBS roofing felt is widely used in professional flat roofing because it combines durability with the flexibility required to cope with normal movement and changing temperatures.
This membrane remains flexible at temperatures down to approximately -10°C, helping provide dependable performance in colder weather conditions.
The upper surface is finished with fine sand, creating a versatile roofing membrane that can be incorporated into different built-up felt roofing specifications.
The sanded finish makes this product especially useful as a substantial intermediate or underlay layer beneath a compatible mineral cap sheet.
Unlike a decorative mineral-finished cap sheet, the sand surface is primarily designed to form part of the roofing system rather than provide a decorative exposed finish.
SupaTec 4mm Sand Finish Roofing Felt is suitable for a wide range of roofing projects, including:
Each roll measures 7.5 metres long by 1 metre wide, providing approximately 7.5 square metres of roofing membrane before allowing for overlaps.
The manageable roll size makes it suitable for both smaller roofing projects and larger roofs where multiple rolls are required.
It is particularly useful for garages, extensions, workshops, porches and other flat or low-pitched roof areas.
Unlike roofing membranes designed exclusively as an underlay, this 4mm SupaTec Polyester Sand Finish Felt is listed for use as a:
This versatility allows the membrane to be incorporated into different built-up roofing specifications depending on the requirements of the project.
For roofs where the final layer will remain exposed, always ensure the complete roofing system and finishing layer are appropriate for the intended application.
SupaTec is designed for professional torch-on roofing installation.
The membrane should first be unrolled, correctly positioned and allowed to settle before being rolled back ready for application.
Heat is then carefully applied to activate the bitumen on the underside, allowing the roofing membrane to bond securely to the prepared substrate or underlying roofing layer.
When correctly installed, torch-on roofing provides a strong, continuous and highly effective waterproof covering.
Important: Torch-on roofing involves the use of an open flame and should only be carried out by suitably trained and competent installers using the correct equipment and fire-safety procedures.
Where the use of a roofing torch is unsuitable, the membrane may also be installed using a compatible cold felt adhesive, depending on the specification of the roofing system.
Always follow the adhesive manufacturer’s application instructions and ensure that the substrate and roofing membrane are compatible with the chosen fixing method.
SupaTec 4mm Sand Finish Felt is particularly well suited to multi-layer flat roofing systems.
A typical system may include:
When correctly installed as part of a two-layer roofing system, SupaTec carries a stated 10-year guarantee.
Whether you’re installing a completely new flat roof or replacing an ageing felt roofing system, SupaTec provides a versatile solution suitable for both new-build and refurbishment projects.
Its 4mm thickness, polyester reinforcement and SBS modified bitumen construction make it an excellent choice for customers looking for a heavy duty professional roofing felt rather than a lightweight shed roofing product.
Choose SupaTec SBS Torch-On Polyester Sand Finish Roofing Felt 7.5m x 1m – 4mm for a strong, versatile and professional-grade roofing membrane suitable for garages, extensions, workshops, outbuildings and a wide range of flat roofing projects.
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| Shipment method | Estimated delivery time | Shipment cost |
| Standard | 3-5 business days | As specified at checkout |
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