The Gerband Astra Phs Control Membrane is a membrane designed to provide optimal vapour control. With a fixed vapour resistance level of Sd 10m, it prevents the diffusion of internal vapour into the building envelope in winter and allows for diffusion in summer. This helps to prevent a build-up of condensed water vapour within the building envelope, which can lead to mildew growth and constructional damage. The CE sign according to DIN 13984 ensures the quality of the product. It is available in a size of 1.5m x 50m.