1.1 This specification covers asphalt-saturated organic felts intended to be used in the following applications:

1.1.1 As underlayment for steep slope roofing products in the construction of steep slope roofing systems;

1.1.2 As ply in low-slope built-up roof applications. The felts, with or without perforations, are intended to be used with asphalts conforming to the requirements of Specification D312/D312M;

1.1.3 As waterproofing barrier with asphalts conforming to the requirements of Specification D449/D449M in the construction of water proofing systems.

1.2 The values stated in either SI units or inch-pound units are to be 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 non-conformance with the standard.

1.3 The following safety hazards caveat pertains only to the test method portion, Section 8, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.