Waterproofing a wall from the inside involves a straightforward, 4-step process: prepare the surface, patch cracks, apply waterproofing paint or membrane, and install a drainage system if hydrostatic pressure is an issue.
You can waterproof your clients' basements from the inside or the outside, but the most thorough jobs will use a combination of both. Always apply sealants on both sides of a basement and foundation to prevent water from getting trapped in the concrete and damaging it over time.
How do I install a Damp Proof Membrane?
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:
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.
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.
Waterproof Paint & Sealants
If your wall is flat, mold-free, and in reasonably good condition, a waterproof paint or sealant can make a huge difference. This solution forms a barrier against water infiltration - and it's much cheaper than adding tile or a separate membrane.
To make drywall waterproof, apply a liquid waterproofing membrane (like RedGard or AquaDefense), or install waterproofing fabric membranes embedded in thin-set mortar. For areas being tiled, use a paint-on liquid membrane. For non-tiled areas, use a waterproofing primer and specialized paint.
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.
The most affordable waterproofing method is the use of basic acrylic waterproof coatings. However, these coatings may not last as long as premium waterproofing solutions.
The best way to do this is by installing damp proofing which can come in the form of a cream and rods that are inserted into your masonry, or paint and a fabric membrane that can be installed onto your wall. These form a barrier to stop rising damp and condensation from soaking your walls and causing further issues.
Avoiding common basement waterproofing mistakes can save you time, money, and frustration down the road.
The best way to waterproof exterior wall panels is by plastering them. Plastering not only enhances the cosmetic appearance of the walls, but also makes them solid, and protects them against water seepage.
1) Interior Sealants
Interior sealants are a type of basement waterproofing method that involves applying a sealant to the inside of the basement walls and floors. Water can seep into a basement through cracks, gaps, or porous concrete, particularly in areas where there is high groundwater or poor drainage.
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.
Exterior waterproofing stops water at its source outside your foundation, while interior systems manage water after it enters. Exterior methods provide superior structural protection but are highly invasive and expensive. Interior methods are more affordable and easier to service, making them the standard choice for existing homes.
KILZ® Basement & Masonry Waterproofer. KILZ® Basement & Masonry Waterproofing Paint is a premium, interior/exterior waterproofing paint designed for porous concrete and masonry surfaces.
Yes, using a paint primer on drywall is highly recommended—and often essential—for a professional-looking, long-lasting finish. Primer seals the porous paper and joint compound, creates an even surface for paint, and ensures proper adhesion so the paint doesn't peel or flake.
Though the name itself is misleading, KILZ paint and primers do not actually 'kill' mold. But it will prevent mold. The brand does well to kill a stain's ability to show through the final coat of paint by sealing over the stained surface with an impermeable interior barrier.
Is there such a thing as truly waterproof drywall? No traditional gypsum drywall product is truly waterproof. Standard drywall and moisture-resistant drywall will absorb water and deteriorate when exposed to flooding. Cement board does not dissolve in water, but it is not designed as a flood-resistant wall system.
Some people add a small amount of dish soap to drywall mud to reduce surface tension, which helps release air bubbles and create a smoother, more even finish, especially when applying the final "skim coat"; however, this practice is not recommended by professionals as it can potentially weaken the adhesion of the mud ...
Offers the same advantages as a traditional moisture-resistant board with added mold resistance in the core and paper.
For DIY waterproofing on a budget, mix 100% clear silicone caulking with odorless mineral spirits in a 1∶5 ratio. Shake until dissolved and brush this liquid onto tents, packs, or boots. For wood and masonry, apply commercial penetrating siloxane sealers directly to clean, dry surfaces.
Waterproofing a wall from the inside involves a straightforward, 4-step process: prepare the surface, patch cracks, apply waterproofing paint or membrane, and install a drainage system if hydrostatic pressure is an issue.
When installed properly using high-quality products like the AquaTank Waterproofing Kit, tanking can last many years — often the life of the bathroom or wet room. Maintenance and correct application are key.