DuPont Tyvek Housewrap is the ideal breathable membrane for timber frame wall systems, and is also suitable for steel frame and concrete wall construction. It is surface-applied, and should be fixed directly to the sheathing ply/OSB, insulation or blockwork. Tyvek Housewrap is made of high density polyethylene fibres for long-term protection against the elements. This durable, lightweight breathable membrane is windtight and water resistant and designed for use in new build, refurbishment or extension projects. Properties Length: 100m. Width: 1.4m. Roll size: 140m2. Roll weight: 9kg. Mass per unit area: 63 gsm. UV exposure: 4 months. Water vapour transmission: 0.01. Product thickness: 175 m. Composition: high density polyethylene. Features  Highly permeable to water vapour - can be fixed directly to insulation (sd-value: 0.01 m). Windtight and water resistant. Enhances the airtightness of the construction. Lightweight, flexible and easy to install. Should be surface applied, fixed directly to sheathing ply /OSB, insulation or blockwork. Can be left uncovered for up to 4 months while retaining full performance. Long-term performance. Suitable for steel-frame and concrete structures. Fully BBA, IAB, and UKAS approved.