Breathable roofing underlay designed to ventilate roof spaces while offering secondary weather protection. Installers gain a lightweight, flexible roll that is easier to handle and quicker to fit, giving greater confidence on-site. Is Cromar Building Products Breathable Roofing Underlay the right choice for your next roofing job?
⚡ At a Glance
- • Tensile and Tear Strength: Spun-bonded polypropylene layers deliver excellent tensile and tear resistance
- • Best for: Roofers and self-builders fitting breathable underlay to ventilated roofs
- • Not ideal for: Installations that require a fully waterproof, non-breathable membrane
BBA certified breathable underlay manufactured from spun-bonded polypropylene layers. Lightweight and flexible, engineered for strong tensile and tear performance.
Faster installation and easier handling - with lightweight, flexible construction
Spun-bonded polypropylene keeps the roll low in bulk while retaining structural strength, so the material unrolls smoothly and conforms over battens and rafters. Lightweight construction reduces lift and alignment effort during installation.
Quicker to lay by small teams and solo installers, cutting time on pitched roofs and reducing fatigue.
Secure fixing that holds staples reliably - with stable fibre structure
The spun-bonded layers form a consistent web that accepts mechanical fixings cleanly and resists tear-through under tension. Clean cutting edges help maintain staple grip during nailing or stapling.
Staples and fixings stay put during and after fitting, lowering the need for rework and wasted material.
Specification confidence on UK sites - thanks to BBA certification and local manufacture
BBA certification indicates testing and assessment against recognised UK building standards, while manufacture in the UK supports closer quality control and supply oversight. Local production also reduces long-distance logistics.
Specifiers and contractors can rely on consistent performance and easier traceability for regulatory checks.
✨ The 4 Key Reasons for Cromar Building Products Breathable Roofing Underlay
- BBA certified - Gives assurance of tested performance and regulatory compliance
- Easy to cut and fix - Reduces installation time and minimises material waste
- Manufactured in the UK - Supports consistent quality and reliable local supply
- Lightweight roll - Easier to handle on ladders and when pulling taut across rafters
📋 Technical Details at a Glance
- Category: Home Improvement - Roofing Underlay
- Certification: BBA certified
- Material: Spun-bonded polypropylene layers
- Construction: Multi-layer spun-bonded web
- Roll length: 50m
❓ Frequently Asked Questions
Q: Is the underlay BBA certified?
A: Yes, BBA certification is listed, confirming assessment against recognised UK testing criteria.
Q: Can the material be cut and fixed with staples?
A: User feedback confirms that the material cuts easily and holds staples securely during installation.
Q: Where is the underlay manufactured?
A: Manufacture takes place in the UK, supporting local quality control and supply.
🏆 Our Verdict
The Cromar Building Products Breathable Roofing Underlay suits roofers and self-builders who need a reliable, easy-to-install breathable membrane. BBA certification combined with spun-bonded polypropylene construction gives strong tensile and tear performance plus consistent quality. Durable build and certification support long-term performance, making it a cost-effective choice over the life of the roof.
