Section 1504.7 Impact resistance. Roof coverings installed on low-slope roofs (roof slope <2:12) in accordance with Section 1507 shall resist impact damage based on the results of tests conducted in accordance with ASTM D 3746, ASTM D 4272, CGSB 37-GP-52M or the “Resistance to Foot Traffic Test” in Section 5.5 of FM 4470.
Code Interpretation:
This code implies that all low-slope roof covering materials must be able to withstand typical impact loads, such as foot traffic, hail and driving rainstorms. All of these conditions are typical of what a low-slope roof covering will be exposed to throughout the course of the service life. Due to this fact, the referenced standard sets criteria for testing that is required of all low-slope roof material systems.