Protecting bathroom walls from moisture requires a mix of proper substrate preparation, surface sealing, and adequate ventilation. For immediate protection and DIY-friendly maintenance, applying a coat of liquid waterproof membrane and finishing with moisture-resistant paint is highly effective.
The best waterproofing for bathroom walls depends on your budget and if you are tiling. For a complete, reliable barrier in shower areas, waterproof foam backer boards (like Schluter Kerdi-Board or Wedi) are top-tier. For a more affordable and straightforward approach, liquid membranes (like Custom Building Products RedGard or Mapei) painted over cement board are highly effective.
Best Practices for Waterproofing
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:
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.
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 alternatives to traditional drywall in a bathroom depend on whether you are finishing a shower/tub or a dry wall area: use Cement Board or DensShield for wet spaces, and PVC Panels, Waterproof Wall Panels, or Tile for both.
Waterproof wall panels from Multipanel are a great alternative to ceramic wall tiles. Not only do they provide a 100% waterproof finish, they are much faster to install and are much easier to clean and maintain than traditional tiles.
Waterproofing is by far the most important part of any bathroom renovation. It is essential to take your time and get it right to avoid water leaks or costly repairs. However, with the right products, expert advice and attention to detail, this D.I.Y. project is easier than you might think.
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.
Avoiding common basement waterproofing mistakes can save you time, money, and frustration down the road.
Choosing the right waterproofing material depends on whether you are treating a basement wall (below-grade), an exterior foundation, or an interior room like a shower or bathroom. To make an informed choice, refer to the breakdown of the most effective waterproofing materials below.
Grout sealers can reduce moisture penetration but do not make the grout fully waterproof. Epoxy Grout vs. Cement Grout: Epoxy grout is indeed waterproof and more resistant to staining and bacteria growth, which is why it's preferred in high-moisture areas like commercial kitchens or hospitals.
How to waterproof a bathroom - a step-by-step guide
Waterproof breathable fabric repels external liquid water while allowing internal body sweat (water vapor) to escape. It achieves this through tightly woven microfibers, waterproof coatings, or microporous membranes (e.g., ePTFE or PU), often finished with a Durable Water Repellent (DWR) coating to cause rain to bead up.
Wax coating is a traditional waterproofing method that's been around forever. Use paraffin, beeswax, or a special fabric wax bar.
No, water resistant does not mean that it's waterproof as these are two different terminologies. Water resistant would mean that it's water repellent or showerproof and waterproof. What is an excellent waterproof rating? Our waterproof ratings start from a minimum of 2000mm to a maximum of 10,000mm.
The most practical waterproof alternatives to drywall are PVC wall panels, waterproof vinyl wall tiles, and fiber-cement board. Unlike traditional drywall, these materials completely resist moisture and humidity, making them highly effective at preventing mold and mildew in bathrooms, laundry rooms, basements, and garages.
PVC wall panels: These easy to install panels offer a truly waterproof surface with no need for grout, making them easier to clean and maintain. Acrylic or fiberglass shower surrounds: Often found in prefabricated kits, these are fully waterproof and relatively affordable.
Plywood is often used for floors, cabinets, bookcases, roofs, walls and panel systems. Its structure and material are suitable for these areas. Drywall can be used for bathrooms, basements, ceiling, garages and kitchens. Its moisture and mold resistant properties are suitable for these areas.
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.
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.
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.