A waterproof coating is a liquid-applied waterproofing product, sprayed, rolled, or troweled onto a foundation wall’s exterior, curing into a continuous, seamless water-resistant layer without the need for separately applied sheets or panels.
This application method offers the advantage of conforming naturally to irregular surfaces or minor construction imperfections that a rigid sheet membrane might not seal as effectively.
Different coating chemistries offer varying performance characteristics, with some products designed specifically for higher hydrostatic pressure situations and others suited to more moderate moisture conditions.
What Does a Waterproof Coating Involve?
- Liquid product applied by spray, roller, or trowel
- Curing into a continuous, seamless layer
- Multiple coats for adequate thickness in many products
- Careful surface preparation before application
Why Are Waterproof Coatings Important?
Because a coating is applied as a liquid and cures in place, it naturally fills small surface irregularities and cracks that might otherwise require additional sealing work with a sheet-based system, making coatings a popular choice for walls with imperfect or uneven surfaces. This adaptability is part of why coatings remain a widely used waterproofing method despite the availability of alternative membrane systems.
Proper application thickness and cure time matter significantly to a coating’s ultimate performance, since an under-applied or improperly cured coating can fail to achieve the water resistance the product is actually capable of providing. Following manufacturer specifications closely is the simplest way to ensure the product performs as intended. Skipping this step is a common shortcut that noticeably shortens a coating’s effective service life. This diligence tends to separate a lasting repair from one needing early rework.
Waterproof Coating vs. Elastomeric Coating
Waterproof coating is the general category of liquid-applied waterproofing products. Elastomeric coating is a specific type within that category, formulated to remain flexible and stretch slightly with minor structural movement rather than cracking the way a more rigid coating might.