About Roofing SBS Torch-On Felt - Underlay - 16m x 1m - 2mm

About Roofing SBS Torch-On Felt - Underlay - 16m x 1m - 2mm is a underlay felt for felt / bituminous flat roof system applications, helping create reliable waterproof protection on flat roofs.

This underlay felt is used as part of a built-up felt roof system to create layered waterproof protection. It is commonly used on garages, extensions, dormers, porches and outbuildings, either over new OSB/plywood decking or suitable existing felt overlays where the full system allows.

Best for

• Built-up felt flat roof systems
• New boards or compatible existing felt overlays

Key features

• SBS modified glass fibre base sheet
• Economy range for general purpose roofing with no guarantee
• Roll Weight: 32kg
• System type: Felt / bituminous flat roof system
• Designed for long-lasting waterproof protection when installed as part of the correct system
• Roll size: 16m x 1m

Application / installation

• Trade-only installation advised because torch-on work involves hot works and fire risk
• Install in dry, suitable conditions unless the specific product states damp-weather application is allowed
• Surface must be clean, sound and prepared before application
• Allow for laps, overlaps and correct layer sequencing in the felt system

System components / used with

• Torch-on cap sheets, underlays and venting/base layers
• Bitumen primer, felt adhesive or mastic where specified
• OSB/plywood decks or compatible existing felt overlays
• Gas torch equipment and suitable PPE for hot works
• Manufacturer's suggested 3-layer built-up specification:
• Chesterfelt Debovent torch on venting base layer
• About Roofing Supplies SBS Mineral Cap Sheet
• Chesterfelt HT180 Sanded Pour & Roll layer

System guarantee

• To keep costs down, and to offer a quality product at a contract price this product does not have a manufacturers guarantee.
• 20-year product guarantee subject to the correct roof specification

Coverage

• Roll coverage: approx. 16m² before laps, overlaps and waste

Technical details

• Our own brand SBS Torch On Mineral Roof Felt is an economical entry level SBS product using modified glass fibre base sheets and reinforced polyester final layers, manufactured for us by an industry leader.

Torch-on felt system information

• Use as part of a suitable multi-layer built-up roofing system with compatible preparation, underlay and cap sheet layers.

Things to consider before buying

• Coverage is approximate; allow extra for laps, overlaps, detailing and waste
• Check substrate compatibility before ordering: OSB, plywood, concrete and existing felt overlays may need different preparation
• Install in dry conditions and avoid unsuitable cold temperatures unless the product data allows otherwise
• The surface must be clean, dry and free from loose material before application
• Hot works require suitable fire safety precautions and should be carried out by trained users