BASE V Underlay Roofing Felt S3.0 S-F 10m2 - SBS Modified Bitumen Torch-On Membrane, Fiberglass Reinforced, Sanded Finish, 3mm, 1m x 10m Roll, Black/Grey

Flat roofs demand a base layer that can withstand heat, moisture, and structural movement without compromising the waterproofing system above it. The BASE V Underlay Roofing Felt S3.0 S-F 10m2 provides a robust foundation for multi-layer torch-on roofing systems, combining SBS-modified bitumen with a fiberglass reinforcement to deliver exceptional dimensional stability and crack resistance. This 3mm thick membrane is engineered for heat-welded application, ensuring a seamless bond that locks out water and vapour.

Who is it for

Professional roofers and contractors who install built-up roofing systems on flat or low-slope roofs. It is equally suitable for damp proofing applications where a reliable, torch-applied barrier is required. The product is ideal for projects that must comply with EN 13707 standards and demand a base layer that can accommodate thermal movement without tearing or puncturing.

Main features

• SBS-modified bitumen offers enhanced flexibility and elasticity, even at low temperatures down to -5°C.
• Fiberglass non-woven reinforcement provides high tensile strength and resistance to deformation.
• Fine sanded top surface ensures excellent adhesion for subsequent layers and improves foot traffic grip during installation.
• Thermofusible film on the underside melts uniformly under torch heat, creating a strong bond to the substrate or insulation.
• Fully waterproof once installed, forming an impermeable barrier against rain, snow, and ground moisture.
• Roll dimensions of 1m width

Specifications

• Product Type: Modified Bitumen Underlayment Roofing Felt
• Application Method: Torch-on (Heat-weldable)
• Reinforcement Type: Fiberglass Non-woven Fabric
• Nominal Thickness: 3.0 mm
• Nominal Weight: 3.0 kg/m²
• Roll Coverage Area: 10 m²
• Roll Width: 1 meter (1000 mm)
• Roll Length: 10 meters
• Bitumen Type: SBS Modified Bitumen
• Top Surface Finish: Fine Sanded
• Bottom Surface Finish: Thermofusible Film
• Cold Flexibility: -5°C
• Waterproofing Properties: Fully Waterproof
• Primary Usage: Base layer in multi-layer flat roof systems, damp proofing
• Standard Compliance: EN 13707
• Color: Black/Grey
• Storage Conditions: Upright, protected from direct sunlight and moisture

Tips

Ensure the substrate is clean, dry, and free of debris before torching. Overlap seams by at least 100mm and press firmly to achieve a watertight bond. Store rolls upright in a cool, shaded area to prevent deformation.