Home & Garden Architecture

How to Waterproof a Concrete Block Foundation

By Home & Garden Last updated Wednesday, April/24/2024

1). Sweep dirt from the block surface with a push broom.
2). Open the windows and doors to improve ventilation. Protect yourself with a face mask.
3). Pour a concrete degreaser into a paint tray and spread the degreaser over the entire block foundation with a paint roller. Make overlapping passes with the roller so that there aren't any spaces left untouched.
4). Wait for approximately 15 minutes before scrubbing down the foundation with a nylon brush. Use short, circular motions to pull off any and all greasy residue from the block foundation.
5). Rinse the concrete block with water and wait 24 hours until it dries before moving on to the sealing process.
6). Add a sodium silicate-based concrete sealant to the tank of a pump sprayer, and spray it onto the block foundation with even strokes of the wand. Overlap your passes to make sure that all of the block is covered with an even coating.
7). Wait at least 48 hours before using the space.

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