Drafts in your house that constantly bring in cold air are nuisances. If the drafts come from inside the walls of your home, the problem grows slightly more complex. A great way to prevent heat from escaping through the woodwork of your home is to use spray foam insulation. This insulation is easy to use, non-toxic, and it expands and contracts.TestingThe first step is to pick an area away from the problem spot and perform a test spray. The spray foam expands to 100 times its initial size, so learn the right way to spray the insulation for maximum proficiency. Experiment with how far away to stand, how hard to press the trigger and how much product to spray. If you figure out all of this information before spraying the area that you need to insulate, there is less room for error.Insulating the areaStart by evenly spraying the area between the studs on the backside of the exterior casing. Allow the foam to set in place as indicated on the spray foam canister. As it expands, the insulation covers small cracks and spaces. Allow it to set and foam before you use a handsaw to cut away any insulation that has expanded outside of the stud area. Once you cut away the excess foam, you can install the drywall with no obstructions.Distribute the spray foam as evenly as possible, and let it sit for the amount of time indicated on the canister. Doing so gives it the best chance to work properly. Benefits of spray foamSpray foam insulation is the best product for sealing up spaces and cracks. As your house expands or contracts, the foam follows suit. It also hampers the growth of mold and helps to create a noise barrier between your home and the outdoors.The best way to conserve on money when insulating your house is to use do-it-yourself spray foam insulation. The process is easy, less expensive than hiring a professional and beneficial in the long run, since the insulation grows with your home.