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.
SUBJECT 2218A-2009由UL - UL 发布于 2009-09-24,并于 2009-10-01 实施。
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