I recently walked my roof. There are some low spots, like little depressions. What causes this and should I be concerned? It seems that the plywood underneath is good but it seems like the underlayment has degraded. Is this normal?
asked Aug 7, 2010 at 14:29
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How far apart are your trusses? Do you have any dormers sitting on the roof?– aphoriaAug 9, 2010 at 15:04
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@aphoria: Not sure what a dormer is– Engineer2021Aug 9, 2010 at 19:42
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1Have you checked in your attic or crawl space? Anything suspicious up there? Any recent construction/demolition in the attic or crawl space?– Jeff WidmerAug 17, 2010 at 3:38
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1Is it a flat or pitched roof?– ChrisF ♦Aug 21, 2010 at 12:13
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1How big are the "little depressions"?– Tester101Sep 3, 2010 at 16:36
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1 Answer
Plywood generally doesn't sag permanently unless it's been wet for an extended period of time. Can you get into the attic to check for water stains around those areas?
