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Cromar Vent 3 Classic Breathable Membrane - 1.5m x 50m - 115gsm

2 Customer Reviews
Product Code:
Estimated Delivery:
1 working day

Our price today, excluding delivery and VAT is

£55.74 inc. VAT £46.45

Product Description

Vent 3® Classic is a breathable roof underlay that gives major benefits over traditional underlays.

The Cromar breather felt is made from two, high-tensile, spun-bonded polypropylene layers. This triple layer, high performance, breathable membrane is thermally calendared to a micro-porous polypropylene film.

  • Layer one - waterproof surface
  • Layer two - breathable waterproof membrane
  • Layer three - protection from abrasion and damage, giving additional strength

This products has exactly the same specifications as the Vent 3 Light breathable membrane, but the Classic has a heavier GSM at 115, compared to this Light's 95 GSM.


  • Clean and easy to use
  • Lightweight and flexible
  • Waterproof membrane
  • High vapour permeability
  • Long-term durability and tensile/tear strength
  • High wind uplift resistance
  • BS 5534:2014 compliant


Can be used in supported or unsupported roof systems, regardless of whether they are tile, slate or metal, and in warm and cold roof applications.

Equally effective whether draped unsupported over rafters or laid directly onto insulation.

Product Specification

Brand Cromar
Colour Light grey upper, white lower
Compliance Yes
Elongation 51 longitudinal, 65 transverse (%)
Length 50m
Roll Area 75m²
Roll Weight 8.7kg
Storage Rolls should be stored flat on their sides on a smooth, clean, dry surface & under cover protected from sunlight
Tear Resistance (L/T) 99 longitudinal, 110 transverse (N)
Tensile Strength 195 longitudinal, 130 transverse (N per 50mm)
Thickness 0.43mm
Water Tightness W1 unaged, W1 aged
Water Vapour Transmission (Sd) 0.02
Weight 115gsm
Width 1.5m

Delivery, Cancellation & Returns

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Customer reviews

27 April 2018
Great stuff to use nice and strong yet pliable

21 August 2017
Great product , great price would highly recommend .