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Cromar Protect 1F Non-Breathable Membrane - 1m x 15m

Product Code:
Estimated Delivery:
1 working day

Our price today, excluding delivery and VAT is

£13.62 inc. VAT £11.35

Product Description

A non-breathable roof underslating, which gives major benefits over plastic and traditional 1F bitumen based underslating felt.

Manufactured in the UK, this 1F roofing felt is composed of lightweight yet durable three layer polypropylene sandwich.

Installed quickly and easily, this roof underlay will protect your cold ventilated roof space from wind-blown water, snow and dust. 


  • Clean and easy to use
  • Cheaper alternative to traditional bitumen based 1F felts
  • Lightweight
  • Excellent tensile strength - nail tear resistance
  • No mess
  • Timesaving over bitumen based 1F
  • Completely waterproof
  • Temporary cover for up to 3 months
  • Anthracite colour surface prohibits glare
  • UV and heat stable
  • No gusting wind noise
  • 2 different sizes available


A non-breathable roof underslating.

Simply install by draping horizonatally over your joists.

Slates or tiles are then installed in the the normal manner.

Only suitable for use in cold ventilated pitched roof systems. Warm roofs, or roofs without adequate ventilation, require a breather membrane.

Product Specification

Brand Cromar
Colour Anthracite upper, white lower
Dimensions 1m x 15m
Elongation MD: 65%, TD: 70%
Length 15m
Reaction to Fire Class E
Tensile Strength MD: 180N/50mm, TD: 110N/50mm
Thickness 0.5mm
UV Stability 4 months
Water Tightness Class W1
Weight 0.95kg/m²
Width 1m

Delivery, Cancellation & Returns

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