Air Tightness Membranes

View our portfolio of DuPont™ Tyvek®, Siga and Isover products. Air Tightness and Moisture Control membranes are required to meet improving building regulations. Air and Vapour Control Layers - AVCL - are suitable for roofs, walls and floors and help to reduce convective heat losses but also provide highly engineered vapour control for breathing systems.