Red TriFix roofing underlay roll with black text and mesh, showing overlap guidelines.

Breathable Roof Membrane 160GSM

€100.00

Breathable membrane is a three layer highly breathable, waterproof membrane, constructed from high tensile spun-bonded polypropylene layers, around a microporous polypropylene film.

  • The outer layer forms the functional waterproof surface:
  • The middle layer is the breathable waterproof membrane and the inner layer protects the membrane from abrasion and damage, also giving additional strength.

This enables the fabric to allow moisture vapour to pass through, whilst remaining waterproof. Breathable Membrane is a high-strength, 160gsm roofing underlay built for roofers who want reliability without the faff. Lightweight, easy to handle, and highly water-resistant, it keeps your jobs watertight while letting your roof breathe.

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  • SPECIFICATIONS

    • Material: 3-layer polypropylene composite

    • Weight: 160 gsm

    • Colour: Red on the front, black on the back

    • Roll Lengths: 50 m

    • Widths: 1.5 m

    • Tensile Strength: Longitudinal: 280 N/50mm(±40), Transverse: 200 N/50mm(±40)

    • Elongation: Longitudinal: 70%(±30), Transverse: 90%(±30)

    • Sd Value: 0.02 m

    • Water Resistance: W1

  • USAGE

    Provide an effective solution to protect the building and its occupants from harmful effects of interstitial condensation and external climatic conditions including wind, snow and wind driven rain.

    Typically the stronger the weight of the pitched roof underlay, the stronger it is, but this also depends on the product’s composition. The products have been developed for use in cold and warm pitched roof applications, and are suitable for use draped and unsupported, or fully supported on sarking or insulation boards.

  • HOW TO INSTALL

    1. Lay it printed side up so water runs off correctly.

    2. Overlap joints:

    • Roof pitch 12.5°–15°: 225 mm horizontal lap (unsupported) / 150 mm (supported).
    • Roof pitch ≥15°: 150 mm lap.

    3.Fixing:

    • Can be draped over rafters and secured with battens, or laid taut with counter battens.
    • Fully supported installs (e.g. over sarking boards or OSB) also suitable.

    4. Keep it watertight – use tape version for sealing overlaps.

    5. Protect from prolonged UV exposure before tiles/slates go on.

    6. Repair damage before covering – patch neatly so performance isn’t compromised.

  • WEIGHTS AND DIMMS

    • 160GSM
    • 1.5m*50m   75qsm
    • 12.6KG per roll