Cromar’s breathable roofing membrane underlay range, Vent3 is a high performance underlay for cold and warm roof application. Compliant with BS5534:2014 Wind Uplift rating of zones and certified by the BBA.
Cromar’s breathable roofing membrane underlay range, Vent3 is a high performance underlay for cold and warm roof application. Compliant with BS5534:2014 Wind Uplift rating of zones and certified by the BBA.
