A leaky roof can do a lot of internal damage including creating a breeding ground for mold. Mold can make a home uninhabitable, make you sick and help create structural damage to the home that is costly to undo.
Mold can be toxic to breathe and many people exposed to it for a long period of time can develop high respiratory problems that it hard to even escape in the home anymore.
Since mold is not easy to find you may not even know why you're sick or what you have been exposed to. The main problem with mold is it does not always conveniently grow where you can see it. Often times mold is hidden away where it can go undetected, fed by a leaky roof supplying it with a water source. And once mold is established it can assist in the development of dry rot forming.
If you suspect you have mold check the attic for signs of dry rot, water damage and of course mold itself. You will need to have a contractor look at the damage and replace insulation and possible damaged or infected wood. In all likely hood the mold got its start from a leaky roof so you will need to have a qualified roofing contractor inspect the roof for damage and leaks.
If the roof is not too poorly damaged that it needs to be replaced it will probably need to have a patch job to fix the leaks. To make sure the job is done right and you do not have any future leaks and returning mold problems you should find the best roofer you can. This can be as complicated or as easy as you make it. With access to the internet available to almost everyone there is no reason to not use it for a useful purpose in the search for a roofer.
Using a consumer based web site such as Angie's List it is easy to pull up the best roofers in your area that are recommended by former or current clients. With real customer reviews and not just the advertising that you will find on other sites, you can start to weed out the best from the rest and have a starting point to begin getting bids from.
Select at least three, preferably five of the highest rated contractors and schedule appointments to have them inspect your roof and give you a written bid for repairs. Once you select the best bid from your preferences you should rest easy in knowing that you have hired a contractor who has a good reputation, cares about the quality of his workmanship and is recommended by the community.
The hardest part about getting rid of mold is finding it; the hardest part about fixing your roof should not be finding a contractor.