HOME: Why are there dips in my roof? [solved]
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?
How far apart are your trusses? Do you have any dormers sitting on the roof? - aphoria 12 years ago
@aphoria: Not sure what a dormer is - Engineer2021 12 years ago
@0A0D Look at this for an explanation of a dormer: en.wikipedia.org/wiki/Dormer. Sometimes dormers are only architectural elements, meaning they offer no usable space or are even visible from inside. These are called blind dormers. Depending on how your roof was constructed, if a blind dormer is sitting on top of the roof without proper support, it can causing some bowing. - aphoria 12 years ago
@aphoria: Definitely no dormers then - Engineer2021 12 years ago
Do you know how far apart the trusses are? How thick the plywood sheeting is? - aphoria 12 years ago
@aphoria: I would say the plywood is about 3/4" thick. I may be wrong. Trusses are about 1-2 feet apart I estimate. - Engineer2021 12 years ago
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 12 years ago
@Jeff: Nothing suspicious that I can see - Engineer2021 12 years ago
Is it a flat or pitched roof? - ChrisF 12 years ago
@ChrisF: I'm guessing flat and at about 45 degree angle. - Engineer2021 12 years ago
How big are the "little depressions"? - Tester101 12 years ago
@Tester101: 1 foot across maybe - Engineer2021 12 years ago
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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