Breathable Pitched Roof Underlay

TIL-R Breathable Pitched Roof Underlay is a thermally bonded UV stabilised laminate incorporating a vapour permeable film. The choice available has been carefully designed to meet your standards of usability, quality and price, providing you with the right solution for the job.

The product resists penetration by liquid water yet allows the passage of water vapour.

Low vapour resistance – defined by BS 5250:2002 as a vapour permeable underlay and suitable for use in energy efficient non-ventilated cold pitched roof systems.

Typical Applications

Can be used on all tiled or slated pitched roofs

Can be used to seal roof lights, chimneys, verges, ridges and hips & valleys

Suitable for warm and cold applications


Clean to use and easy to cut.

Strong and durable

High tear resistance

Lightweight – easy to transport and handle.

Breathable - suitable for warm roof application

Water Resistant – achieves W1 classification when tested to BS EN 1928:2001

Flexible – even at low temperatures.

Resistance to water penetration.

Durable – no performance deterioration at highest and lowest UK temperatures.

Available with dual integrated tape


Should not be considered as a primary waterproofing layer

Registered Office: SIG Trading Limited, Adsetts House, 16 Europa View, Sheffield Business Park, Sheffield, S9 1XH. Registered in England No. 01451007 VAT No. GB 487 01733