Heavy Duty Sanded Underlay Felt 1m x 20m

The Heavy Duty Sanded Underlay Felt (1m x 20m) is a robust, bitumen-based roofing membrane designed for use as a base or intermediate layer in multi-layer felt roofing systems. With a durable sanded finish on both sides, this underlay provides reliable waterproof protection and excellent adhesion for a wide range of roofing and shed applications.

Product Features/Specifications:

Manufactured from reinforced bitumen with a glass fibre core, this heavy-duty underlay delivers exceptional strength, flexibility, and resistance to tearing. The sanded surface enhances grip during installation and allows secure bonding with top cap sheets or other roofing layers.

Each roll measures 1 metre wide by 20 metres long, providing 20m² of coverage, making it ideal for both new roofing projects and refurbishment work. Suitable for use with cold-applied adhesives, hot bitumen, or mechanical fixing systems, it’s a versatile solution for professional and domestic applications alike.

Detailed Product Benefits:

Engineered for durability, this Heavy Duty Sanded Underlay Felt forms a dependable waterproof barrier beneath mineral felt or torch-on membranes. The reinforced construction resists movement and cracking caused by temperature changes, ensuring a long service life.

Its sanded upper and lower surfaces promote excellent bonding and easy handling, while the roll format allows quick coverage of large areas with minimal joints. It’s a cost-effective and proven option for creating a watertight, stable roof structure.

Applications and Versatility:

• Base or intermediate layer in built-up felt roofing systems
• Underlay for garages, sheds, and outbuildings
• Suitable for flat, low-pitch, and slightly sloped roofs
• Can be used with cold adhesive or hot bitumen systems

Features & Benefits List:

• Heavy-duty reinforced bitumen roofing felt
• Sanded both sides for improved adhesion and handling
• 1m x 20m roll providing approx. 20m² coverage
• Glass fibre reinforcement for strength and dimensional stability
• Compatible with cold or hot applied roofing systems
• Ideal as a base or underlay beneath mineral felt
• Suitable for flat or pitched roof structures
• Weatherproof and durable for long-term protection

Technical Specifications:

• Product Code: Heavy Duty Sanded Underlay Felt 1m x 20m
• Roll Size: 1 metre (width) x 20 metres (length)
• Coverage: Approx. 20m² per roll
• Material: Reinforced bitumen with glass fibre base
• Finish: Sanded both sides
• Weight: Approx. 38–40kg per roll
• Application: Base/intermediate layer in felt roofing systems
• Usage: Suitable for flat and pitched roofs

Additional Information:

Store rolls upright in a cool, dry area, protected from direct sunlight. Apply in dry conditions for best adhesion. When used with hot bitumen or torch-on systems, follow all relevant safety guidelines and ensure adequate ventilation.

For more information please contact us on 01274 720227 or email us at [email protected]