Waterproofing paint for exterior walls

Keep basements and crawl spaces dry with effective waterproofing techniques

Foundation Waterproofing

The goal of keeping a basement or crawl space dry is an important one. You need a waterproof foundation if you plan to use the basement as living space. But foundation waterproofing is necessary even in unused basement and crawl space areas because high moisture content causes mold to grow on organic materials like wood, fabric, paper and latex paint. Mold not only destroys materials; it also fills the air with hazardous mold spores.

Each waterproofing technique has distinct Pros & Cons

There's been a great deal of controversy about the effectiveness of different foundation waterproofing techniques. Advocates of exterior foundation waterproofing stress the value of an impermeable membrane barrier applied to the exterior of foundation. These people agree that the best time for this approach is during new construction when freshly built foundation walls are exposed.

Once the foundation walls are covered with dirt, installing an exterior waterproof coating or membrane becomes prohibitively expensive and much more disruptive if the house is occupied.

Special coatings are also available for waterproofing foundation walls from inside the foundation. The trouble with waterproof paint is that it rarely works when the ground stays wet and there's significant hydrostatic pressure against foundation walls. Moisture traveling through the foundation wall from outside typically leaks through the paint film or causes it to bubble or peel, admitting water into the basement or crawl space.

Interior drains and a sump pump harness water pressure instead of fighting it

Instead of attempting to hold back a large, high-pressure volume of water, interior French drains take a different approach to foundation waterproofing.

Installed just inside the foundation walls, this drainage system captures water before it reaches the basement or crawl space floor and directs it to a sump pump. The pump automatically ejects water to the exterior when water reaches a preset level in the sump pit. Thanks to advanced sump pump technology pioneered by Basement Systems, this active waterproofing system has proven to be very effective in keeping basements and crawl spaces dry.

Convenience Kits Intl. Seal Krete 101001 Damplock Concrete Waterproofing Paint 1 Gal, White
Home Improvement (Convenience Kits Intl.)
  • Color: White
  • Size: 1 gal
  • Interior and exterior
  • Above and below grade use

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Rust-Oleum Zinsser 05003 Watertite Mold & Mildew Proof Waterproofing Paint. 3 Gal
Home Improvement (Rust-Oleum)
  • ZINSSER & CO #05003 3GAL WTHRPF Paint
United Gilsonite Laboratories Drylok 275 Masonry Waterproofer Water-Based White, 5-Gallon Pail
Home Improvement (United Gilsonite Laboratories)
  • No pre-mixing or pre-wetting necessary
  • Withstands 10 pounds of hydrostatic pressure, greater than a wall of water 22 feet high
  • A breathable film - does not trap moisture in masonry. Applies easily with brush and/or roller and cleans up with soap and water
  • Complies with all current VOC and/or VOS
  • 10-year warranty. Tintable
United Gilsonite Labs Drylok Extreme Latex Base Masonry Waterproofer
Home Improvement (United Gilsonite Labs)
  • Color: White
  • Size: 5 gal
  • Smooth waterproof paint perfect for the most demanding conditions
  • Specially formulated to resist mildew growth on the paint film
Damtite Water Proofing Damtite Water Proofing 02451 Powder Foundation Waterproofer
Home Improvement (Damtite Water Proofing)
  • Color : Gray
  • Size Lb. 45
  • Portland cement-based specially formulated to form a hard impervious surface that waterproofs,
  • seals and protects below grade exterior walls constructed of concrete, stone or masonry.
  • Use for coating drinking water holding tanks or cisterns, birdbaths, fountains, crawl spaces,

Popular Q&A

How do you paint over black tar mastic used to waterproof the exterior of poured concrete basement walls

Brush on latex basement paint will cote the area without problem if
the tar is stable and not subject to high temperatures.

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