World Reference in Waterproofing Technology Contact Home Sitemap Icopal Group Website Products Building Membranes Underroofs Icopal roofing underlays A roof underlay is a layer under the exterior roof that has a primary function of working as the shield that protects the thermal insulation material and the building structure from the effects of the weather. The roof underlay acts as a condensation barrier, which leads condensate water away from the underlay, and thereby also from the insulation material. Diffusion tight The traditional diffusion tight (no vapour through the membrane), which in general is made up of a reinforcing grid of either polyester yarn or polypropylene, which is protected by two layers of low density polyethylene (LDPE). This build–up could also incorporate an additional layer of spun bond that are either hydrophilic (water absorbing) or hydrophobic (water repellent) dependent of the climate and building traditions. Breathable membranes The second type of breather membranes provided by Icopal is high quality coated products that are from a one layer substrate of PP spun bond add a top coating layer of special co-polymer, which gives the breathability. Protecting insulation Insulating roof underlay incorporates a reflective surface which minimises solar gain while also preventing heat loss. Top Local Contact If you wish to purchase Icopal products or learn more about local availability, please contact your local Icopal supplier. Find your local distributor Products Flat Roofing Pitched Roofing Building Membranes Underroofs Foundation Panels Tarpaulins Radon and Gas Membranes Scaffold Sheeting Vapour control layers Wind barriers Sounddeadening membranes Airtight house Civil Engineering Facts about the Group Icopal references worldwide Products Board of Directors Ownership Group history Organisation Group Executive Team Icopal Business Units Code of Conduct Vision, mission and values Vacant positions Business Areas Flat roof Pitched roof Building membranes Civil Engineering Installation Services About Us Products Press Jobs Safety Environment Installation By continuing to browse the site you are agreeing to our use of cookies. Find out more here Icopal ApS© Icopal ApSLyskær 5DK - 2730 Herlev+45 4488 5500+45 4453 5500EmailDisclaimer