How to Seal Cellar Walls

Cellar walls are commonly composed of concrete because it is a durable material, which can be easily formed. Concrete that is left unsealed after curing, however, will allow groundwater to seep through its porous makeup. Avoid the disintegration of your cellar walls by carefully applying a waterproof masonry sealant. You can quickly execute the waterproofing project in just a few days time with materials easily available in a home improvement store.

Wire brush
Goggles
Rubber gloves
Face mask
Pump sprayer
Concrete degreaser
Nylon brush
Garden hose
Concrete sealant

Instructions

- 1
  Scrub the cellar walls with a stiff wire brush to remove surface debris.
- 2
  Protect yourself with rubber gloves, goggles and a face mask. Be sure to open windows and doors so that the area is well-ventilated before continuing.
- 3
  Pour a concrete degreaser into a pump sprayer, then prime the pump as instructed in the user manual.
- 4
  Stand 3 to 4 feet away from the walls, then spray the degreaser onto them evenly. After 12 to 15 minutes, begin scrubbing the degreaser into the wall with a nylon brush. This will prepare the walls for the sealant.
- 5
  Rinse the cellar walls with a garden hose, then wait 24 hours for them to dry.
- 6
  Pour the concrete sealant into the pump sprayer and prime it.
- 7
  Stand back 2 to 3 feet from the wall and spray then sealant onto the walls with long upward and downward overlapping strokes. After 48 hours, the walls will be fully sealed.

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