Any time you’re going to do something like change your roof, then just assume the back story about the best way to do it should be learned. The worst thing you can do is just float along in the wind and be carried by the currents. Guaranteed, there are legal loopholes and things to know about, and never rely on the knowledge or good graces of the roofing contractor to keep you informed.
Anytime there’s a roofing issue, they tend to start small and then grow from there. What you need to do is survey all those places on your roof where there is something coming up from below as these tend to be the problematic areas. You can have a roofing contractor go onto your roof and do this kind of preliminary visual inspection, but of course you can always do this yourself, too, if you want. The external part of your roof, the shingle, is the first line of defense from the elements, but there is material underneath that you need to protect and take care of as well.
Do a thorough inspection inside your attic and on the attic floor when you’re in the planning stages.
As has been mentioned before, you want to find any problem areas that need attention, and this can run the range from minor to major repairs upstairs. You know what wet wood looks like, and it will have a darker appearance than surrounding wood. In addition to the new roof, a good contractor will be versed in roof repairs, and perhaps if the job is small enough he’ll throw in some minor repairs as part of the overall package.
You’ll be able to spot a sagging roof if it’s bad enough, and that’s a good reason to replace your roof, and this is something that is generally found in older homes or those with structural roof damage. The best thing to do is not let this go because it will only get worse and cause more issues. Sometimes if there’s been a leak for a long time, then this softens the wood and the weight of the roof causes the sagging. So you have been around long enough to know that ignoring a roof problem such as sagging and bending is not something you want to let go on indefinitely. Once you have decided on buying a roof, then you have to think about who will be installing it. The success or failure of a new roof installation ultimately comes down to how much effort you put into it.