Designing or installing tiled roofs at low pitches can present major weatherproofing risks. Traditional underlays often fail when water backs up under tiles during heavy driving rain, leading to costly callouts, snagging delays, or compromised specification compliance.
ISOLINE LOW LINE is a leading BBA-certified sub-roof system designed to act as the primary waterproofing layer beneath roof tiles or slates – allowing you to confidently specify and install tiled finishes down to pitches as low as 10°.
Why Contractors & Specifiers Choose ISOLINE:
- Low-Pitch Performance: Enables standard clay and concrete tiles or slates on low-pitch extensions and developments down to 10°.
- Fully Certified & Compliant: BBA-approved and bre tested with an impressive 111 Pa Pressure Factor – more than three times the BBA target of 30 Pa
- Waterproof, Guaranteed: Backed by a 30-year guarantee – eliminating remedial costs.
- Simple On-Site Installation: Lightweight, corrugated sheets fix directly over timber battens or board for fast, straightforward fitting.
Technical Resources & Support for Your Next Project
Access complete installation guides and CAD drawings, or book a technical CPD session for your design team.
Working on a live tender or complex low-pitch detail? Explore how ISOLINE LOW LINE can help or contact our UK technical support team for project-specific guidance.