This product is no longer available —
Internal AVCL - Variable vapour resistance
Air & vapour control layer (AVCL) with variable vapour resistance for roofs, walls and floors. Membrane reacts to humidity within adjacent materials, allowing any moisture within the structure which would otherwise be trapped to dry out.
The membrane behaves like a traditional AVCL during the winter. Its vapour resistance range is very wide, with an Sd value of 0.05 m to more than 30 m. Its semi-transparent composition makes it easy to locate the supporting framework behind.
Roll size: 1.5 x 50 m. Lap: 100 mm.
Smooth satin copolymer
Variable vapour resistance
DuPont Typar (PP) film, polypropylene
50000 x 1500 mm