Water can also get into your house from outside, and preventing this will protect your house from excess moisture inside. Along with fixing leaks in the roof and elsewhere in the house, you can also get rid of water by making sure that water is drawn away from your house.  One way to do this is by installing extra gutters if necessary to direct rainwater away from your home. If you have trouble with groundwater coming in, consider installing vapor barriers in the basement and a sump pump system that will collect water. Gutters are an integral part of the system that keeps water away from your house, so it’s important to keep them clean and well maintained. Clean the gutters every fall and spring to remove dirt, debris, leaves, and other matter. Address leaks in your gutters as soon as you notice them. If you can't repair the leak, replace the section of damaged gutter. A crawl space that has a dirt floor is susceptible to mold, because moisture coming up from the ground can make the area wet all the time. To prevent this, dry out the area with fans, and then cover the dirt with a sheet of plastic. Covering the dirt won’t necessarily prevent moisture from coming up, but it will stop mold from growing in the crawl space itself.
Drain water away from your house. Clean and fix gutters. Install plastic sheets in crawl spaces.