10 Best Basement Waterproofing Sealers 2025 in the United States

The Liquid Rubber Basement and Foundation Repair Sealant offers a comprehensive solution for those looking to waterproof their basements and foundations. It provides a robust, flexible coating that can prevent leaks and water damage effectively. With its 900% elongation capability, the sealant is designed to withstand structural movements and temperature changes without cracking, making it a reliable choice for long-term basement and foundation protection.

This product is not just limited to interior use; it can be applied both indoors and outdoors, which enhances its versatility for various projects, including foundation leak repairs and even shower liner installations. The sealant's compatibility with a range of materials—including concrete, masonry, wood, and metal—further widens its application scope. The kit includes a 5-gallon bucket of sealant, a set of caulks, and Geo Textile, providing the essential components needed for a complete waterproofing system.

There are some considerations to keep in mind. The coverage area varies significantly depending on the surface—50 sq ft per gallon for interiors and 20 sq ft for exteriors—requiring multiple coats for effective results. This aspect might demand more product than initially expected. The application is straightforward, requiring no mixing, and it can be applied using a brush, roller, or sprayer. However, it's not suitable for walkable surfaces due to its tackiness once cured.

The product also emphasizes safety, being water-based and containing zero VOCs, making it safe for indoor use. It is crucial to follow the recommended application steps, especially using the Geo Textile on joints and transitions for a watertight system. Potential buyers should note that only full kit returns are accepted, which might be a consideration when deciding to purchase. This kit is ideal for DIY enthusiasts and professionals seeking a reliable solution for basement waterproofing and foundation repairs.

Ames Maximum Stretch is a versatile waterproof sealant that stands out in the basement waterproofing sealers category due to its elastomeric and rubberized properties. One of its key strengths is its impressive 650% elongation, which makes it highly elastic and resistant to cracking or peeling. This quality is particularly beneficial for areas that experience temperature fluctuations or structural movement, providing a long-lasting seal. The high light reflectivity (88%) also helps in reducing surface temperatures, which can lower cooling costs when applied to roofing. The sealant is non-toxic, eco-friendly, and has low VOC levels, making it a safe choice for indoor applications as well as outdoor use on various materials including metal and rolled roofs. The application method is flexible; you can brush, roll, or spray it on, accommodating different user preferences and project requirements.

The drying time may vary depending on environmental conditions, and while the coverage area is substantial given its 4.6-gallon size, larger projects may require multiple containers. Additionally, it's primarily designed for low-slope roofs, which might limit its use in other applications. The product's weight (50.1 pounds) can also make handling a bit cumbersome during application, especially for DIY users or those who may not have much experience in roofing repairs. Lastly, while the bright white color can be advantageous for heat reflection, some users might prefer a different tint or color for aesthetic reasons.

Ames Maximum Stretch is a strong contender for anyone looking to address waterproofing needs in basement areas, particularly if you're focused on roofs or low-sloped surfaces. Just be mindful of the application specifics and project scale when planning your waterproofing projects.

Thompson’s WaterSeal Multi-Surface Waterproofer Stain in Clear is a versatile sealer that can be used on concrete, brick, and exterior wood surfaces. It provides a clear finish which allows the texture of the material to show through while protecting it from water damage. This product is easy to apply, making it suitable for various outdoor projects like patios, fences, and decks.

The advanced polymers in the stain ensure a fade-resistant finish and UV protection, which means that the color will look good year-round. With a coverage area of up to 375 square feet per gallon, it's efficient for larger projects. However, it’s important to note that while it offers water resistance, its effectiveness in a basement setting may vary since it's designed mainly for exterior surfaces. For those looking to waterproof areas prone to mold and mildew or requiring heavy-duty basement waterproofing, additional measures may be necessary.

Thorough surface preparation is key to achieving the best results with this product. It is a good fit for anyone needing a clear, easy-to-use waterproofer for various outdoor surfaces.