An average house produces 14 litres of moisture a day yet air leakage is a major contributor to heat loss. Energy saving, waterproof and airtight - TLX UV breather membranes allow moisture to escape and prevent air leakage. Features High tear strength to weight ratio. High breathability. Available in a variety of weights and widths. Most popular of all Web products. Offers substantial increase in strength and abrasion resistance. Can be used between open rafters and on sarking boards. Weight: 130gsm.