b'Why Indoor airPLUS MattersOur homes are built to reduce water intrusion by: Preparing the site with a layer of sand or aggregate below the concrete slabfor better drainage. Damp-proofing and waterproofing exterior walls that are below grade. Installing a drain or sump pump in the basement/crawlspace to remove water. Properly affixing gutters, downspouts, and other controls to direct water awayfrom the home.'