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1.1 This specification is applicable to the use of plastic lumber materials and of wood-plastic composite materials, and no other plastic composite materials, used as exterior wall coverings, as part of an exterior wall assembly.

1.2 This specification is not applicable to the use of plastic lumber materials or of wood-plastic composite materials contained in exterior wall assemblies when not used as part of the exterior wall covering.

1.3 This specification is not applicable to the use of any of the following types of materials:

1.4 This specification is not applicable to the use of plastic lumber materials or of wood-plastic composite materials in any application other than the one addressed in 1.1. In particular, this specification is not applicable to the use of plastic lumber materials or of wood-plastic composite materials as exterior deck boards, stair treads, handrails, guards, or soffits.

1.5 The values stated in inch-pound units are to be regarded as standard. Any SI units given in parentheses are for information only.

1.6 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.

1.7 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.