Chapter
Nov 9, 2015
Hail Evaluation of Bituminous Roofing Membranes: Understanding Interply Mopping Voids
Authors: Justin Donaldson, M.ASCE [email protected], Marco DeLeon, M.E., M.ASCE [email protected], and Stewart Verhulst, M.S., M.ASCE [email protected]Author Affiliations
Publication: Forensic Engineering 2015
Abstract
Forensic evaluation of roofing membranes for hail damage is a large and growing industry throughout the United States, especially in the Midwest and across the South where hailstorms are prevalent throughout the year. For these evaluations, accurate assessment of the roof membrane and the causation of damage is an imperative. An accurate assessment requires knowledge of the potential causes of damage for the roof system, including determination of damage related to hail impact. Laboratory testing of membrane samples is often an important component of such an evaluation. Damage resulting from interply mopping voids, which are as-built conditions, is often misidentified as hail damage in multi-ply bituminous roof membranes. This misidentification frequently occurs because the characteristics of distress to the membrane surface caused by interply mopping voids can be similar to the characteristics of membrane surface distress caused by hailstone impacts. The purpose of this paper is to educate readers about interply mopping voids and the type of distress that they can cause. Examples involving roofing membrane samples cut from various structures and analyzed in a laboratory will be used to illustrate interply mopping voids and the damage that results from their presence. Finally, this paper will outline ways to better distinguish hail impact distress from interply mopping void distress when performing a forensic roof evaluation in the field.
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© 2015 American Society of Civil Engineers.
History
Published online: Nov 9, 2015
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P.E.
Senior Project Director and Discovery Lab Director, Nelson Forensics, 2740 Dallas Parkway, Suite 220, Plano, TX 75093. E-mail: [email protected]
P.E.
Vice President of Research and Development, Nelson Forensics, 2740 Dallas Parkway, Suite 220, Plano, TX 75093. E-mail: [email protected]
P.E.
V.P. and Executive Technical Director, Nelson Forensics, 9701 Brodie Lane, Suite 201, Austin, TX 78748. E-mail: [email protected]
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