This test method provides impact resistance data for the evaluation of low slope roofing systems . For purposes of this standard@ roof systems consist of various component materials installed on combustible or noncombustible decking intended for installation on roofs with an incline which is 14??25 % or 3 in/ft) or less. The test evaluates the effect of impact from the steel ball at locations on the assembly selected to be most vulnerable@ such as (but not limited to) edges@ corners@ unsupported sections and joints. This test method does not evaluate the effect of weathering@ temperature@ aging or similar effects on the impact resistance of roofing system components. These and other factors@ including time@ roof slope@ roof system configuration and application influence the performance of roofing materials in the field. It is not the objective of this test to address all of these factors.
UL SUBJECT 2218A-2009 history
2009UL SUBJECT 2218A-2009 Outline of Investigation for Impact Resistance of Roofing Systems (Issue 1)