Waterproof Foundation – What Are Your Choices?

If you are going to build a new house, you need to waterproof the foundation so that you do not have a wet basement in a few years.

There are various waterproof products and systems in the market so it can be really confusing. So what are your options?

Here’s a brief overview of the most common foundation water proofing systems to help you make that decision:

1. Liquid Rubber Foundation Water Proofing Membrane

Are elastomeric polymerized coatings made of liquid rubber – the same quality as the materials used to make your car’s tires?

Benefits: They are easy to apply, quick to dry, cold applied. You can do this yourself using a sprayer, roller or trowel. The liquid heals in a flexible rubber coating, which is able to fill existing small holes and eliminate potential future cracks in the foundation wall as the building collapses. The rubber is flexible. They also usually come with a long warranty, and are environmentally friendly, or solvent-free, with very low solvent content. Very economical.

Disadvantages: Coverage is likely to be inconsistent, but the latest product will help you determine the “correct” thickness by color intensity, ie if you apply the product and you see a light patch, you just Add more liquids. Additional surface preparation and treatment may be required. If there are large cracks or holes in the structure, you must fill it with cement or other troll-grade material before applying the overall coating. In addition, some liquid membranes require longer curing times for concrete before they can be applied to ensure proper bonding.

2. Hot Applied Liquid Rubber Foundation Waterproofing Products:

It is a rubber asphalt compound that forms a strong, flexible monolithic waterproofing membrane. Can also be installed on roofs.

Benefits: Established at virtually any structural level. Ideal for rough surfaces. Monolithic, seamless, water tight, removes water and removes moisture. Provides strong protection due to the way it is implemented.

Disadvantages: The surface must first be primed with primer. The cost is high because the product has to be applied in layers – basically you apply the first coat of hot liquid rubber, then you have to quickly press on the sheet reinforced with cloth in this warm layer, then the hot liquid rubber. Apply a second coat. Waterproofing In addition, depending on the local building code you will need to apply 2 or 3 of these sheet layers. Because of this, the flexibility is low. And since it is hot, you have to be very careful – it is best to apply it by a certified specialist.

3. Sheet membrane

The most common are self-adhesive rubberized asphalt membranes consisting of rubberized asphalt laminated in a waterproof polyethylene film.

Benefits: The biggest permanent thickness is because they are “pre-fabricated” to the required standard. Mechanically strong, resistant to hydrostatic pressure. Even cover large holes or bad spots.

They can be applied to concrete, metal, wood or masonry surfaces.

Disadvantages: They are difficult to apply due to their high “viscosity”, and the cost is high in some places. At least 2 people need to be entered correctly to apply.
Lots of extra work = extra cost required. If there are irregularities on the surface, the sheet you want to cover must first be smoothed with a coat so that the surface can be smoothed. You will also need to learn about joint treatment, lap joints, corners, penetration, priming, patching, etc.

4. Cementitious water proofing

Cement-based flexible waterproof membrane. These may include Portland cement, acrylic sand mixes, plasticizers and other active waterproof chemicals to enhance its durability and effectiveness.

Benefits: Very easy to use, just mix the powder in water as recommended by the manufacturers and apply with a brush or troll. Very accessible – Available from masonry product suppliers, or specialized dealers. Paintable. Also comes in different colors. In most cases a coat is sufficient, although some areas may require the use of reinforcing mesh. low cost. Corrosion and weather resistant. Can be applied as a positive or negative side waterproofing.

Disadvantages: There is no flexibility – the cement is not stretched, so as the structure settles, cracks are likely to appear in the future. Prior to application, the surface must be free of protrusions, gaping cracks, oil, paint, water repellent and any other foreign material that may act as a bond breaker. Holes should be filled with approved block filler.

5. Bentonite water proofing

Bentonite is an underwater foundation waterproofing product consisting of sodium bentonite clay that is sandwiched between 2 layers of woven and non-woven puncture resistant polypropylene fabric. Comes as clay panels and sheets.

Benefits: Can absorb large amounts of water. And when it takes water into the soil, it blooms and pushes itself into cracks and gaps where it stays permanently as a barrier against water. It is flexible and resistant to most chemicals. Non-toxic, non-polluting. No smoke can be applied in cold weather.

Disadvantages: Due to the way the clay works, the cell does not form until the foundation is backfilled and the water reaches the bentonite material, which means you cannot verify the integrity of the seal.


As you can see, a lot depends on your own situation, needs, wants and what makes you feel comfortable. The best way is to talk to experts, check the manufacturers’ requirements, especially the time of concrete curing, temperature limits and additional labor requirements. Yes, foundation waterproofing may seem expensive at first glance, but remember that this is a long term solution which if applied properly will save you a lot of time, headaches and money in the future, so please, Don’t do that Stingy on it.

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