An air vapour control layer provides a method of meeting the mandatory requirements for the control of condensation, set out in BS 5250 Code of Practice for control of condensation in buildings. It can significantly contribute to the control of air leakage, an important factor under the Building Regulations document Part L (England & Wales) and the SBSA guidelines (Scotland). Sika Limited provides a variety of vapour control layers, selected to suit a wide range of applications.