Monarperm Breathe Two from Icopal is a vapour permeable membrane manufactured from a laminated layer of polymer film sandwiched between two layers of polypropylene fabric. Its BBA-certified to be suitable for zones 1-2 with overlaps under the batten without the use of lap tape of less than 345mm.An underlay for discontinuous roofing in pitched and over rafter applications in ventilated and non-ventilted roofs, this vapour permeable membrane is 0.5mm thick with a blue topside and white underside. Cleverly designed to resist the penetration of water, you can use Monarperm Breathe Two as a temporary protective weatherproof layer as well as an underlay in vertical weatherboarding and rain screen cladding.This product is highly puncture and nail tear resistant and is compatible with most common roof substrate materials. Please note: Icopal Monarperm Breathe Two cannot be used with solvent-based timber treatments.More information on Icopal Monarperm Breathe Two can be found in the data sheet here, alternatively call 01752 692 760 for expert roofing and insulation advice.Icopal Monarperm Breathe Two propertiesWidth: 1.5mLength: 50mThickness: 0.5mm