ASTM D7492/D7492M-16a PDF Download

The ASTM D7492/D7492M-16a standard provides guidelines and recommendations for the selection and installation of drainage system media in conjunction with waterproofing systems. The purpose of this guide is to be used alongside other relevant ASTM guides, such as C898/C898M, C981, C1471/C1471M, D5898/D5898M, and D6622, to ensure the proper functioning of the overall waterproofing and drainage system.

The standard focuses on prefabricated drainage media used in waterproofing systems on both horizontal and vertical surfaces. It considers different types of drainage media, including rigid and semi-rigid insulation boards and rigid materials like plastics. The primary goal of the guide is to ensure that the drainage media effectively drains water away from the membrane of the waterproofing system. However, it does not cover other aspects of drainage system performance, such as soil dewatering efficiency.

It is important to note that this standard does not cover other drainage media like gravel and filter fabric systems, nor does it address drainage materials or system designs used for vegetative roof systems, which require specialized designs. This standard is the only known comprehensive standard on this topic published by ASTM.