Non-Breathable Roof Underlay

  • Non-breathable
  • High tensile and tear strength
  • Clean and easy to handle
  • Durable
  • UV resistant
  • BBA approved
  • Lightweight alternative to traditional IF
  • Integrated tape for sealing laps
  • Guidance lines for minimum laps


Marley Universal non-breathable underlay is a lightweight (116g/m²), high-performance membrane for pitched roofs. Supplied in 1m x 45cm rolls with integrated tape for sealing laps, the underlay is fully compliant with BS 5534 and suitable for all UK wind zones 1 - 5.

Marley underlays are manufactured using the latest materials and processes, and each incorporates a number of useful features that assist in ensuring installation that is not only correct, but also compliant with the latest British Standards.

BBA certification:

Non-breathable underlay

Function & Compatibility

Universal non-breathable underlay is designed to integrate seamlessly within a full Marley roof system and is suitable for roofs with traditional ventilation products or ventilated batten cavities.

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