Water or moisture in your basement can lead to an array of costly and time-consuming repairs. Fortunately, there are several things you can do to prevent it. The most common methods include: Interior: This can include sealants, coatings, and other methods to prevent condensation. Exterior: The goal here is to prevent water from making its way into your property in the first place. Waterproofing options can include coating the exterior walls with a waterproof barrier and exterior damage systems. Drainage: This method can include fixing a poorly functional drainage system, or adding a drainage system if you don't have one.