... D4869/D226,36''X72' Asphalt felt #15 and #30 15# ASTM D4869,36''X144' 15# ASTM D226,36''X144' 30# ... ' 30# ASTM D226,36''X72' Asphalt felt #15 and #30 DescriptionWidthlengthWeightThicknessUsageASTM D-226 roofing felt 30#36in0 ... other sloped coverings.ASTM D-226 roofing felt 15#36in0.914 m144ft43.89 m23kg0.8mmASTM D-4869 ... roofing felt 15#36in 0.914m 144ft43.89m 16.5kg0.6mmASTM ...