Exterior French Drain A French drain is usually a technique of buried perforated pipes that redirects groundwater clear of your house. Other measures contain implementing a waterproofing coating or reinforcing the seal close to basement windows with spray foam insulation. Outdoor drainage issues can be corrected by including downspout extensions https://emilianotcjzg.answerblogs.com/35683277/the-best-side-of-basement-waterproofing