PHS Astra Vapour Control Membrane Fixed SD 1.5m x 50m enables airtightness and vapour control in roof and wall constructions. It has an optimum fixed vapour resistance level of Sd 10m. This allows for an ideal level of vapour control, by preventing diffusion of internal vapour into the building envelope and prevents a build-up of condensation within the building envelope, which can cause mildew growth and structural damage.
