This is the first issue of the Outline of Investigation for Impact Resistance of Roofing Systems, Subject 2218A. 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.