Robert E Lee Posted March 29, 2012 Report Share Posted March 29, 2012 The photos are from this mornings inspection, laminated shingles with spots of missing granules, while the spots may have been caused by hail there weren't any other signs present that I normally see when there has been hail, i.e. dents on the furnace vent cap, or other metal surfaces on the roof. Anyone else seeing irregular loss of granules on this type of roofing material? Click to Enlarge 143.97 KB Click to Enlarge 143.79 KB Click to Enlarge 141.66 KB Link to comment Share on other sites More sharing options...
AHI in AR Posted March 29, 2012 Report Share Posted March 29, 2012 I can't imagine that hail could take out chunks nearly that large. I would suspect a manufacturing defect. Link to comment Share on other sites More sharing options...
Nolan Kienitz Posted March 29, 2012 Report Share Posted March 29, 2012 Ditto what Kevin said. Link to comment Share on other sites More sharing options...
allseason Posted March 29, 2012 Report Share Posted March 29, 2012 Hail damage will commonly be on only one side of the roof due to prevailing wind at the time. Link to comment Share on other sites More sharing options...
Jim Katen Posted March 30, 2012 Report Share Posted March 30, 2012 I've heard them called "tent blisters." They're the result of a manufacturing defect that causes the asphalt to blister up off the fiberglass backing. When the blister shears off, you're left with exposed asphalt as in your pictures. The condition is considered cosmetic. Link to comment Share on other sites More sharing options...
kurt Posted March 30, 2012 Report Share Posted March 30, 2012 Usually caused by a bit of water in the mix during mfg. Link to comment Share on other sites More sharing options...
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