Cromar Vent 3 Classic Breathable Membrane - 1m x 50m - 115gsm2 Customer Reviews
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
Equally effective whether draped unsupported over rafters or laid directly onto insulation.
|Colour||Light grey upper, white lower|
|Elongation||51 longitudinal, 65 transverse (%)|
|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)|
|Water Tightness||W1 unaged, W1 aged|
|Water Vapour Transmission (Sd)||0.02|