The best drywall waterproofing depends on the area. For active wet zones like showers, liquid waterproofing membranes (e.g., RedGard or Schluter-KERDI) over backer board are ideal. For non-wet areas like basements, use waterproofing masonry paints like DRYLOK. For sealing damaged drywall, penetrating sealers like Zinsser Gardz work best.
In general, polyurethane waterproof coatings are one of the most durable options since they are resistant to chemicals and can withstand extreme temperatures and UV exposure.
Sealants: Use sealants to fill gaps and cracks around windows, doors, and plumbing fixtures. Silicone sealants are ideal for such areas owing to their flexibility and durability. Waterproof Membranes: For moisture-prone areas such as basements, apply waterproof membranes.
KILZ® Drywall Primer & Sealer seals new uncoated drywall which helps achieve a uniform professional quality finish in less coats. It dries fast (ready to paint over in 1 hour), easy to clean-up and ready to apply with standard applicators. KILZ Drywall Primer prevents new drywall surface from absorbing too much paint.
Semco's Liquid Membrane stands out for its durability and ease of use. Unlike some other waterproofing products, Semco's membrane is versatile and works on a variety of surfaces, including drywall, wood, concrete, stucco and tile. It's a highly effective product that you can trust for the long-term health of your home.
Some drywall finishers add a small amount of dish soap (like Dawn) to drywall mud as a workability hack. They do this to act as a surfactant, which reduces the surface tension of the mud.
Avoiding common basement waterproofing mistakes can save you time, money, and frustration down the road.
Waterproofing can be applied to both exterior and interior walls, and it serves as an effective safeguard against water-related problems such as seepage, dampness, mildew growth, and structural damage.
Top Picks
Materials that are considered 100% waterproof typically include synthetic polymers and coated fabrics that create an impermeable barrier to water, such as PVC (vinyl), silicone-coated nylon/polyester (silnylon), rubber, and polyurethane laminates. These materials do not allow water to pass through, making them ideal for tents, rain gear, and coverings.
Here are the top six waterproofing methods in 2025 that can keep every part of your home secure and resilient for years to come.
Using a Waterproof Primer
The most popular way to waterproof your drywall is to use oil- or latex-based waterproofing primer. These primers are made by most paint manufacturers and are designed to prevent mold and mildew from growing on the surface of your drywall.
There's a risk of trapped moisture, which can induce mold growth and material failure. Some waterproofing methods limit flexibility post-application, potentially causing structural issues. Waterproofing can pose environmental concerns due to harmful chemicals and energy-intensive production.
No, wet drywall does not always mold. However, because gypsum board and its paper facing provide an ideal organic food source for spores, mold will quickly form within 24 to 48 hours if the drywall is not actively dried out.
Grade 1b – No seepage. Damp areas from internal and external sources are tolerable. Grade 2 – No seepage is acceptable. Damp areas as a result of internal air moisture/condensation are tolerable; measures might be required to manage water vapour/condensation. Grade 3 – No water ingress or damp areas is acceptable.
Top 10 Waterproofing Chemical Manufacturers in India
Yes, you can waterproof drywall, but standard drywall is highly porous and will degrade in wet environments without proper preparation. For high-moisture areas like shower surrounds, bathrooms, and basements, use specific waterproofing methods depending on your application:
Potential Interior Waterproofing Issues
One of the main issues you might encounter is it doesn't entirely prevent water from entering your basement. It simply manages the water once it's inside, which can lead to structural damage over time. Another downside is it can be quite disruptive to install.
Drylok works well for stopping minor moisture seepage and dampness, but it is not a fix for active leaks or severe drainage issues. It is designed as a vapor barrier and masonry waterproofer, not a structural repair.
Materials that are considered 100% waterproof typically include synthetic polymers and coated fabrics that create an impermeable barrier to water, such as PVC (vinyl), silicone-coated nylon/polyester (silnylon), rubber, and polyurethane laminates. These materials do not allow water to pass through, making them ideal for tents, rain gear, and coverings.
Prime the Surface Appropriately
Don't skip the primer, it's the glue that makes your waterproofing stick! Use the exact primer recommended for your surface (check the product specs), and roll or brush it on evenly—no thick puddles or thin, patchy spots.
Only a licensed waterproofing contractor is legally allowed to perform waterproofing work in residential construction or renovation projects where the value of labor and materials exceeds $5,000. Even for smaller jobs, insurance implications and resale requirements often demand licensed involvement.