Neal Lewis Posted October 29, 2009 Report Share Posted October 29, 2009 I don't know if i've ever heard of a definitive cause for cracks in older fiberglass shingles? Why do they crack in a straight line and not just random? This line of cracks runs through seven courses of shingles, and is a second layer over older board sheathing. Download Attachment: Dilworth 032.jpg 398.81 KB Quote Link to comment Share on other sites More sharing options...
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