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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?

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How far apart are your trusses? Do you have any dormers sitting on the roof? – aphoria Aug 9 '10 at 15:04
@aphoria: Not sure what a dormer is – 0A0D Aug 9 '10 at 19:42
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Have you checked in your attic or crawl space? Anything suspicious up there? Any recent construction/demolition in the attic or crawl space? – Jeff Widmer Aug 17 '10 at 3:38
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Is it a flat or pitched roof? – ChrisF♦ Aug 21 '10 at 12:13
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How big are the "little depressions"? – Tester101♦ Sep 3 '10 at 16:36
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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?

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