Roofing paper is a underlay of asphalt shingle over roof deck.
Sencondary barrier to moisture caused by wind-driven rain .
Roofing paper
Description:
This roofing paper(ASTM D-226 ,ASTM D-4869 ) is made of a specially formulated organic sheet which has been fully saturated with waterproofing asphalt.
Uses:
A roofing paper used as an underlay beneath asphalt shingles, wood shakes, tiles and other sloped coverings.
Physical Requirements:
Test Item | ASTM D-226 I | ASTM D-226 II | ASTM D-4869 I | ASTM D-4869 II |
Pliability at 23±2°C. Tested shall not crack when bent 90 at a uniform speed over a roundedcorner of radius in table for each type. |
12.7mm (radius) |
19.1mm (radius) |
12.7mm (radius) |
12.7mm (radius) |
Tear strength at 23±2°C min, | 2.5N | 5.0N | 2.0N | 3.0N |
Breaking strength at 23±2°C, min MD | 30 lbf/in | 40 lbf/in | 30 lbf/in | 40 lbf/in |
Breaking strength at 23±2C, min CD | 15 lbf/in | 20 lbf/in | 15 lbf/in | 20 lbf/in |
Loss on heating at 105°C for 5h max | 4.0% | 4.0% | 6.0% | 6.0% |
Width of the roll | 36 in | 36 in | 36 in | 36 in |
Area of the roll | 432 ft² | 216 ft² | 432 ft² | 216 ft² |
Net mass of saturated felt, min | 560 g/m² | 1270g/m² | 400 g/m² | 660 g/m² |
Saturation,% by wt., min | 120% | 150% | 100% | 120% |
Storage and Handling
Roofing paper require protection from damage and the weather.
Store rolls upright in a dry location and never install when wet or over a wet roof deck.
