AirGuard vapor barrier Designed to reduce condensation. AirGuard vapor barriers (AVCL) are 100% windproof. This helps to reduce convective heat loss and provides effective protection against condensation in all types of buildings. AirGuard vapor barrier can significantly reduce heat loss and improve energy efficiency. Thanks to the control of heat transfer and heat reflection inside the building, the vapor barrier provides cooling in summer and warmth in winter. AirGuard roof vapor barrier provide advanced control of steam flow to enable it to meet construction requirements and achieve environmental goals. The use of AirGuard vapor barrier for internal walls and external insulation with Tyvek breathing membranes creates a windproof and vapor permeable building partition. This creates a holistic solution that ensures optimal energy efficiency and internal comfort.