How to Seal Basement Floor & Walls


Sealing a leaky basement not only reduces issues with flooding and mold but also gives a homeowner an opportunity to increase his potential living space by making the basement area waterproof and ready for finishing. Water can be absorbed by and permeate through cement block and concrete basement walls. Waterproofing primer seals concrete and cement to keep water and moisture out.

Things You'll Need

  • Putty knife
  • Hydraulic cement
  • Waterproofing sealant
  • Water-based polyurethane sealant
  • Paint rollers
  • Extension pole
  • Wet any cracked areas to be patched. Use a putty knife to patch cracks in the basement walls and floors using a quick dry hydraulic cement.

  • Smooth the hydraulic cement with a putty knife, and repeat with a second layer to fill cracks even with the surface of the floor.

  • Paint with a generous coat of water sealant, such as Dry-out or Kilz on walls. This will seal out moisture and prevent water from seeping in through the cement surfaces.

  • Let it dry for 1 hour, and apply a second coat of the water sealant paint to the walls.

  • Seal the floor using a water-based polyurethane sealant which will lock out water and moisture and protect the surface.

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