1. Scope 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 Rigid PVC recycled plastic may be used in this product in accordance with the requirements in Section 4. 1.3 Nonmandatory color-hold guidelines are provided in Appendix X1 for manufacturers product development and quality performance use only. 1.4 Rigid (unplasticized) PVC soffit is covered in Specification D 4477. 1.5 Siding produced to this specification shall be installed in accordance with Practice D 4756. Reference shall also be made to the manufacturers installation instructions for the specific product to be installed. Note 1—Information with regard to siding maintenance shall be obtained from the manufacturer. Note 2—Siding color-hold guidelines are for dark gray-blue, light-gray blue, green, dark beige, light beige, gold, yellow, white, and gray regions. Additional colors will be added and color-hold guidelines refined as weathering program data is developed. 1.6 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. 1.7 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 3—There are no ISO standards covering the primary subject matter of this specification.