Why are there dips in my roof?

Question

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?

nstenz · Accepted 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?

Why are there dips in my roof?

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