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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.

  • Clean To Use
  • Strong & Durable
  • High Tear Resistance
  • Lightweight
  • 120 gsm



  • 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.
  • Breathable – suitable for warm roof applications.
  • Strong – three layer construction resists tearing.
  • Water Resistant – achieves W1 classification when tested to BS EN 1928:2001
  • Resistance to water penetration.
  • Lightweight – easy to transport and handle.
  • Flexible – even at low temperatures.
  • Clean to use and easy to cut.
  • Durable – no performance deterioration at highest and lowest UK temperatures.
  • Available with dual integrated tape

View the Wind Zone Chart for TIL-R Membranes

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TIL-R Classic Breathable Pitched Roof Underlay is suitable for use as a fully supported or unsupported underlay in tiled or slated pitched roofs. It remains flexible and easy to handle even at low temperatures allowing installation to be carried out in all conditions normal for roofing.

TIL-R Classic products have been designed to offer reliable, affordable, everyday solutions, helping you to get the job done.


  • Clean to use
  • Lightweight construction
  • Highest vapour permeability
  • Printed cutting grid
  • 100 gsm
  • Available with dual integrated tape

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TypeWeightLengthWidthProduct codes
TIL-R PLUS120g50m1m270090035/10535547
TIL-R PLUS120g50m1.5m270090040/10535548

TypeWeightLengthWidthProduct codes
TIL-R Classic100g50m1m270090005/10535541
TIL-R Classic100g50m1.5m270090010/10535542
TIL-R Classic PLUS100g50m1m270090015/10535543
TIL-R Classic PLUS100g50m1.5m270090020/10535544