Cromar Building Products

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 surfaceLayer two - breathable waterproof membraneLayer three - protection from abrasion and damage, giving additional strengthThis product 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.BenefitsClean and easy to useLightweight and flexibleWaterproof membraneHigh vapour permeabilityLong-term durability and tensile/tear strengthHigh wind uplift resistanceBS 5534:2014 compliantOverview..