You can repair small cracks in concrete or cinder block walls with hydraulic cement or sealant. You can also fill gaps around doors, windows, ducts, and pipes with polyurethane sealer. Complete the sealing of basement walls with several layers of waterproof paint.

If the walls are damp with seepage from outside but they aren’t actively leaking, an elastomeric waterproofing coating can seal them. You can apply most products yourself by brush, roller or spray. Before you do, patch cracks with hydraulic cement and remove efflorescence.

There are three main solutions that can be used to waterproof your basement slab. Which one you use will be mostly determined by the issue that plagues your slab in the first place. The three options we’ll discuss here are sump pump installation, French drain installation, and concrete slab replacement.