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Icopal Monarperm Breathe One 1m x 50m Zone 1

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£57.05 Incl. VAT
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Monarperm Breathe One is a vapour permeable membrane from Icopal. The breather membrane is manufactured from a laminated polymer film layer, sandwiched between two layers of polypropylene fabric. It's blue on the topside and white underneath, coming in at just 0.43mm thick.

This breather membrane is highly puncture and nail tear resistant and compatible with most common roof substrate materials for ease of use. It is designed to be an underlay for discontinuous roofing in pitched and over rafter applications in ventilated and non-ventilated roofs in zone 1 wind uplift areas. Its BBA-certified for use in Zone One with less than 345mm overlaps under a batten without lap tape and 944 Pa.

Features & Benefits: Icopal Monarperm Breathe One 1m x 50m Zone 1

  • High puncture resistance
  • High nail tear resistance
  • Compatible with most common roof substrate materials for ease of use


  • Thanks to its water penetration and UV resistance, you can use Icopal Monarperm Breathe One in alternative ways. This includes as a temporary waterproofing cover for up to 3 months, a secondary layer to protect against snow or hard-driven rain and an underlay in vertical weatherboarding and rain screen cladding.

Please note:

  • For Zones 1-2, we recommend Icopal Monarperm Breathe Two. For a vapour permeable membrane to cover all zones, we recommend Icopal Monarperm Breathe All Zones
  • Icopal Monarperm Breathe cannot be used with solvent-based timber treatments.

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