Common issues:
Roofs typically only have a couple common issues. Leaking and sagging. Leaking roofs are cause by old worn out shingles or by damage sustained from a storm or disaster. Leaky roofs typically don't make themselves known until they mess up your nice ceiling or walls. If you suddenly see water stains and bubbling on your drywall, you might have a leaky roof. Since we try and diagnose from the bottom up, you will have already ruled out walls and plumbing. The easiest way to find a leak is to go to your attic in the same general area where you saw the water stain. You will usually be able to look up at the roof framing and see water stains on the timbers if you have no attic, you should make all diagnostics from the outside if possible. If your shingles are in good shape overall, you may be able to remove a small portion and repair the affected area. If you have old shingles or find rot, it is going to be best to replace your entire roof, flashing and the rotted decking. The other most common issue is sagging, like floors, this is due to insufficient structural framing for the load the roof is under. This will often be found in areas effected by a rogue snowstorm, or old houses. Either way, if your roof is sagging, you will need to reinforce the roof. If it is localized sagging not due to water damage, you can likely install extra rafters and framing to supoort the weak area. More often however, sagging roofs need to be completely rebuilt by starting fresh from the framework.
Roofs typically only have a couple common issues. Leaking and sagging. Leaking roofs are cause by old worn out shingles or by damage sustained from a storm or disaster. Leaky roofs typically don't make themselves known until they mess up your nice ceiling or walls. If you suddenly see water stains and bubbling on your drywall, you might have a leaky roof. Since we try and diagnose from the bottom up, you will have already ruled out walls and plumbing. The easiest way to find a leak is to go to your attic in the same general area where you saw the water stain. You will usually be able to look up at the roof framing and see water stains on the timbers if you have no attic, you should make all diagnostics from the outside if possible. If your shingles are in good shape overall, you may be able to remove a small portion and repair the affected area. If you have old shingles or find rot, it is going to be best to replace your entire roof, flashing and the rotted decking. The other most common issue is sagging, like floors, this is due to insufficient structural framing for the load the roof is under. This will often be found in areas effected by a rogue snowstorm, or old houses. Either way, if your roof is sagging, you will need to reinforce the roof. If it is localized sagging not due to water damage, you can likely install extra rafters and framing to supoort the weak area. More often however, sagging roofs need to be completely rebuilt by starting fresh from the framework.