ANSI/GRHC/SPRI VR-1-2011 Procedure for Investigating Resistance to Root Penetration on Vegetative Roof

American National Standards Institute (ANSI). Single Ply Roofing Industry (SPRI). Approved 24.02.2011. — 11 p.This standard is intended for testing the resistance of vegetative roof coverings to normal root and rhizome penetration. The test described in this standard has been developed to evaluate the ability of a roofing material to resist normal root or rhizome penetration through a root protection barrier, or waterproofing layer. This test is based on the FLL “Procedure for Investigating Resistance to Root Penetration at Green Roof Sites.” The FLL procedure was developed in Germany and is based on findings and testing experience of evaluations of various materials over a number of years. This test is intended to build on this experience and provide an equivalent evaluation protocol for North American test sites.