1.1 This specification covers resilient treads made of rubber and vinyl for interior use. 1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information This specification covers resilient stair treads made of rubber and thermoplastic vinyl for interior use. Treads covered by this specification includes the following types, class, and groups: Type TS, Type TP, Type TV, Class 1, Class 2, Group 1, and Gr