1.1 This specification establishes requirements and test methods for the materials, dimensions, warp, shrinkage, impact strength, expansion, appearance, and windload resistance of extruded single-wall siding manufactured from rigid (unplasticized) PVC compound. Methods of indicating compliance with this specification are also provided. 1.2 The use PVC recycled plastic in this product shall be in accordance with the requirements in Section 4. 1.3 Rigid (unplasticized) PVC soffit is covered in Specification D 4477. 1.4 Siding produced to this specification shall be installed in accordance with Practice D 4756. Reference shall also be made to the manufacturer's installation instructions for the specific product to be installed. Note 1 - Information with regard to siding maintenance shall be obtained from the manufacturer. 1.5 The values stated in inch-pound units are to be regarded as the standard. The SI units given in parentheses are for information purposes only. 1.6 The following precautionary caveat pertains to the test method portion only, Section 6, 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 and health practices and determine the applicability of regulatory limitations prior to use. Note 2 - There is no known ISO equivalent to this standard.