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Protocol for assessment of hail-damaged roofing

North American Conference on Roofing Technology



hail damage; test area; asphalt shingle; wood shingle; wood shake

A protocol has been developed for assessing hail-impact ddamage to steep- slope roof systems. The protocol includes a definition of hail-caused damage to roofing, a detailed field inspection procedure, and a calculation method for determining repair or replacement of hail-damaged roofing materials based on economics. This paper limits its discussion to asphalt shingles and wood shingles and shakes, although the general principles can be applied to other steep-slope roof systems. Hail damage is quantified by examining test areas on directional roof slopes to determine the number of damaged shingles/ shakes per roofing square. The difficulty in making roof repairs is incorporatedvia a repair difficulty factor. Finally, the decision to repair or replace hail-damaged roofing is made on an economical basis by comparing expected costs to remove damaged shingles/shakes versus costs to replace roofing on entire slopes.

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