ASTM D4869/D4869M-16a (R2021) pdf free download.Standard Specification for Asphalt-Saturated Organic Felt Underlayment Used in Steep Slope Roofing.
1.1 This specification covers asphalt-saturated organic felt for use as an underlayment with steep slope roofing.
1.2 The objective of this specification is to provide a finished product that will lie flat and resist wrinkling, puckering, and shrinking when left exposed to the sun, rain, frost, or dew for a period of two weeks after application.
1.3 The values stated in either SI units or inch-pound units are to he regarded separately as standard. The values stated in each system may not be exact equivalents: therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.
7. Workmanship, Finish, and Appearance
7.1 The felt shall be thoroughly and uniformly saturated. and shall show no unsaturated spots at any point upon cutting 50 mm [2 in.] wide strips at random across the entire sheet and splitting them open for their full length.
7.2 The saturated felt may be surfaced lightly on one side with talc or other finely comminuted mineral material to prevent sticking in the roll.
7.3 The finished material shall he free of visible external defects such as holes, ragged or untrue edges, breaks, cracks, tears, protuberances, and indentations.
8. Sampling and Test Methods
8.1 Sample the material in accordance with Test Method D 146/D I 46M and determine the properties enumerated in this specification in accordance with Test Methods D 1 46/D 1 46M, D1922, D6136/D6136M, and F1087 as specified below.
.2 Determine the saturation percent of the felt in accordance with Test Method Dl46/D146M. Section 19 (Bituminous Saturant), and the saturating efficiency of the desaturated (dry) felt by the following method:
8.2.1 Calculate the percent of asphalt saturation by dividing the mass of the asphalt saturant by the mass of the desaturated (dry) felt and multiply the result by 100.
8.2.2 Determine the kerosine number of the desaturated (dry) felt in accordance with Test Method D6136/D6136M.ASTM D4869/D4869M pdf download.