... NMoisture vapour transfer rate6,61 g/m²/h8,41 g/m²/h5,12 g/m²/h5,12 g/m²/hTensile203,8 +/- 71,3 N114 ... used as an underlay beneath asphalt shingles, wood shakes, tiles and other sloped coverings.Physical Specificatons:Average roll weight,Lbs/roll ... :432sq.ft(40sq.m)Rolls per pallet:30Pallet size:1.1mx1.1m building paper and fieltro M.H.R. 15/40 and M.H.R ...