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If its a "used" house this should have been checked with the inspection /apprasal so you should be good to go - however if the roof is NOT in good shape, thats a $10,000 +/- repair just to re-shingle, so it's something you want inspected and it's worth delaying the closting if it's failing.
If its new construction, should be fine and any possible issues should be under warranty - let alone checked by the building inspector.