KB

Excerpt: 

"A protocol has been developed for assessing hail-impact damage 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 incorporated via 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."