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‘Extreme’ wall membranes deliver Class W1 performance for severely exposed sites

Protect Membranes, UK producer of construction and roofing membranes, has introduced two new waterproof breather membranes designed for use externally on timber frame, SIPs and CLT wall panels, achieving a Class W1 resistance to water penetration.

Protect Membranes

Launched in tandem with the STA Advice Note 18 published by the Structural Timber Association in consultation with the NHBC, the products are designed specifically for buildings sited in severely exposed locations which are typically high altitude, open to high winds and on westerly coastal sites in England, Ireland, Wales and Scotland.

Protect Thermo Extreme is a low emissivity, insulating breather membrane with microporous film and microperforation technology to ensure high watertightness and vapour permeability. This protects the outer sheathing from moisture and allows vapour to pass into the external wall cavity. Featuring a highly reflective surface, Protect Thermo Extreme helps deliver low overall U-values when the foil faces into an unventilated airspace, achieving an aged thermal resistance R-value of 0.77m²K/W, incorporating printed branding.

Protect TF200 Extreme is a high performance membrane used on the cold side of the insulated panel to minimise the risk of interstitial condensation, with microporous film technology to ensure high vapour permeability and exceed requirements recommended by TRADA and NHBC. It offers a temporary, first line of protection to the whole of the external wall.

Both membranes are CE marked, available ex-stock in 3m widths and 100m lengths and produced in the UK.

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