Formerly under the jurisdiction of Committee C17 on Fiber-Reinforced Cement Products, this specification was withdrawn in November 2019. This standard is being withdrawn without replacement due to its limited use by industry.

This specification covers asbestos-cement siding, including accessories, designed to provide the weather-exposed sidewall surfaces of buildings. Siding in the following form is covered: siding shingles - uniform thickness, generally rectangular in shape and having wavy, random, thatched, straight, or irregular butts, clapboards - uniform thickness, generally longer and narrower in shape than shingles, and usually with exposed edge straight, and sheets - uniform thickness, rectangular in shape, larger in unit sizes than shingles or clapboards. Asbestos-cement siding shall be composed of a combination of asbestos fiber and Portland cement or Portland blast-furnace slag cement, and not more than 1 weight % of organic fiber.

1.1 This specification covers asbestos-cement siding, including accessories, designed to provide the weather-exposed sidewall surfaces of buildings. Siding in the following forms is covered:

1.1.1 Siding Shingles—Uniform thickness, generally rectangular in shape and having wavy, random, thatched, straight, or irregular butts.

1.1.2 Clapboards—Uniform thickness, generally longer and narrower in shape than siding shingles, and usually with the exposed edge straight.

1.1.3 Sheets—Uniform thickness, rectangular in shape, larger in unit sizes than shingles or clapboards.

Note 1: For additional information, see Specification C725 for Semidense Mineral Fiber Siding.

1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.3 Warning—Breathing of asbestos dust is hazardous. Asbestos and asbestos products present demonstrated health risks for users and for those with whom they come into contact. In addition to other precautions, when working with asbestos-cement products, minimize the dust that results. For information on the safe use of chrysotile asbestos, refer to “Safe Use of Chrysotile: A Manual on Preventive and Control Measures.”2