Testing Built-up and Modified Bitumen Roofs for Hail Damage

This presentation initially took place at IIBEC's 2022 International Convention and Trade Show in Orlando, Florida.

Although there is currently no ASTM method specifically for testing built-up and modified bitumen (bituminous) roof systems for hail-caused damage, laboratories routinely test bituminous roof systems for hail-caused damage. This presentation discusses the ASTM test methods that are commonly referenced in these laboratory testing reports. This presentation also includes findings from research the author’s company has performed using ASTM D3746, Standard Test Method for Impact Resistance of Bituminous Roofing Systems, to illustrate what hail-caused damage of bituminous roofs looks like and to compare our ASTM D3746 test results to actual hail-caused damage to bituminous roofs. The intent is to provide exemplar photographic examples for visual comparative purposes.

Stephen L. Patterson, RRC, PE
ROOFTECH | Fort Worth, TX

Stephen L. Patterson has been in the roofing industry for almost 50 years. He founded Roof Technical Services Inc. (ROOFTECH) in 1983 and has been an active consulting engineer and roof consultant ever since. ROOFTECH has provided laboratory testing, including testing for hail damage, since the late 1980s. Patterson has been technical director/director of engineering for two roofing manufacturers and managed a roof contracting company for four years.