The standard choice in lightweight breathable roofing underlay for warm and cold pitched rafter roofs. The Product has a weight of 100 g /m2 and available in 1 x 50m and 1.5 x 50m roll sizes.
Monarperm 500 is a dark grey breathable roofing underlay made from polypropylene (PP) spun bonded material with a dark grey microporous film for added UV and ageing stability. Monarperm 500 is made so it has high nail tear resistance in both machine and cross direction making it more stable to work with .