Vapour Control Layers (VCLs) and Air Barriers are essential components in modern energy-saving building designs. Air Barriers ensure that the building envelope is properly sealed to control ventilation and prevent heat loss in compliance with Building Regulations Part L. Installed on the warm side of insulation, Vapour Control Layers (VCLs) protect insulates from interstitial condensation. As impermeable air-barriers, VCLs also increase the building’s air-tightness. Properties Incorporates an energy-saving thermo-reflective surface. Multi-purpose membrane: air barrier thermo-reflective vapour control layer. Suitable for roof, wall and floor installations. Acts as an air barrier to control ventilation. Controls vapour to minimise interstitial condensation. High tensile strength reinforcement. Choice of grades.