Best Waterproofing Compound for Concrete: Top Picks for Every Job
Looking for a reliable waterproofing compound for concrete? This guide highlights five products that address different needs—from quick patching and crack isolation to long-lasting sealing for basements and driveways. Built for interior and exterior use, these options suit DIYers, professionals, and homeowners tackling moisture, cracks, and moisture-related damage. Read on to find which option best fits your project, whether you need fast patching, flexible membranes, or curing and sealing performance.
| Product | Best For | Key Benefit |
|---|---|---|
| Waterproofing SuperPatch 7LB CONCRETE SUPER PATCH | Small repairs and patches | No mixing required, ready-to-use patch formula |
| Ardex 8+9 Rapid Waterproofing and Crack Isolation Kit | Tile installation prep | Flexible waterproof coating with wide coverage |
| GOODTAKE Water-Based Concrete Curing & Sealing | New slabs and driveways | Moisture retention with corrosion inhibition |
| Liquid Rubber Basement and Foundation Sealant | Basement and foundation leaks | High elongation, permanent waterproof membrane |
| Schluter Kerdi-Fix Sealant | Multi-surface sealing | Versatile, odor-neutral bonding and sealing |
Waterproofing SuperPatch 7LB Concrete Patch
Brand: Damtite Waterproofing
Features: This repair patch is designed for durable concrete patching on walls and floors. It seals cracks and holes to prevent water intrusion and long-term damage in interior or exterior spaces. The ready-mix liquid formula requires no mixing, enabling fast repairs and efficient patching. It forms a tough bond with concrete surfaces, suitable as a patch filler or crack patch to restore structural integrity.
Best for: Quick, ready-to-use patches on small to medium cracks and holes where rapid repair is needed. Choose this when you want a simple method without mixing and when the repair must seal moisture effectively.
Caution: Not a full waterproofing system; best used as a patch repair in addition to other moisture barriers if high water pressure is present.
Ardex 8+9 Rapid Waterproofing and Crack Isolation Kit
Brand: Ardex
Features: This cement-based membrane forms a highly flexible, waterproof coating that protects against topside water infiltration. Suitable for interior and exterior floors and walls in commercial and residential settings, including bathrooms, showers, and kitchens prior to tile or stone installation. Coverage up to 300 sq ft for commercial units, 100 sq ft for kits; quick flood test in just 4 hours.
Best for: Projects requiring a flexible waterproof membrane ahead of tiling or stone work. It’s well-suited for bathrooms and showers where long-term moisture protection is critical.
Caution: As a membrane, ensure correct surface priming and cure times per installation steps to achieve optimal performance.
GOODTAKE Water-Based Concrete Curing & Sealing Compound
Brand: GOODTAKE
Features: Advanced moisture retention formula acts as a moisture barrier for fresh concrete, locking in water to maximize strength development and prevent early cracking. It provides dual-action cure and seal protection, forming a curing membrane while offering temporary sealing against stains and weather. Includes a built-in corrosion inhibitor to protect embedded steel rebar and metal.
Best for: New concrete slabs, driveways, or patios where proper hydration and early strength gain are essential. Choose this for moisture retention and corrosion protection during curing.
Caution: Not a long-term exterior sealer; plan additional sealing for exterior exposure beyond the curing window if needed.
Liquid Rubber Basement and Foundation Repair Sealant
Brand: Liquid Rubber
Features: This flexible sealant creates a permanent waterproof membrane for basement waterproofing, foundation leak repair, shower liners, and planter boxes. It provides up to 900% elongation, offering superior adhesion to concrete, masonry, wood, metal, and foundation surfaces. Beyond basements, it suits DIY waterproofing projects with consistent flexibility across temperatures.
Best for: Basements, foundations, and other areas where a highly flexible, long-lasting membrane is required. Choose this when you need significant elongation to handle movement and temperature changes.
Caution: A single-component sealant; for active leaks, consider complementing with a broader waterproofing system if necessary.
Schluter Kerdi-Fix Sealant and Bonding Compound
Brand: Schluter
Features: A versatile sealant and bonding compound with a silane-modified polymer base. It bonds effectively to wood, stone, concrete, metal, glass, and plastics. Flexible enough for waterproofing tasks and specifically compatible with Schluter shower systems. Odor-neutral and durable for indoor and outdoor use.
Best for: Multi-surface sealing and bonding tasks, especially in shower systems or areas requiring a durable, flexible sealant. This option is ideal when you need a single product for bonding and sealing across different materials.
Caution: Not a stand-alone waterproofing membrane; pair with appropriate barriers where water pressure is high or continuous exposure is expected.
Buying Guide
What should you consider when choosing a concrete waterproofing compound?
- Project type: Patch repair, curing, or full membrane waterproofing require different products. Patch products are best for localized cracks, while membranes protect larger areas.
- Surface and environment: Interior vs. exterior, floors vs. walls, and exposure to moisture or chemicals influence compatibility and performance.
- Flexibility and movement: Basements and foundations benefit from highly flexible sealants that handle movement without cracking.
- Cure time and application: Some products are ready-to-use, while others require mixing or specific curing windows for optimal results.
- Durability and longevity: Consider corrosion inhibitors for embedded metal, especially in new slabs or reinforced concrete.
- Compatibility with tile or coatings: If installing tile, ensure the selected membrane is compatible with tiling substrates and grouts.
How to choose by scenario
- Small cracks or patch repairs: Choose Waterproofing SuperPatch for ready-to-use repairs with strong bonding.
- Pre-tiling preparation: Ardex 8+9 provides a flexible membrane suitable before tile or stone installation.
- New concrete curing: GOODTAKE offers moisture retention and corrosion protection during curing.
- Basement or foundation leaks: Liquid Rubber provides a permanent membrane with high elongation for movement.
- Multi-surface sealing: Schluter Kerdi-Fix works well when bonding and sealing across varied materials is needed.
FAQ
- What is the difference between a patching compound and a waterproofing membrane? A patching compound repairs cracks and holes, while a membrane provides an ongoing moisture barrier across larger areas.
- Can I use these products outdoors year-round? Yes, but verify temperature ranges and UV exposure for each product’s specifications.
- Do these products require mixing? Some are ready-to-use liquids; others may require mixing per the label instructions.
- Is curing and sealing the same as waterproofing? Curing helps concrete develop strength, while sealing prevents moisture loss; membranes offer ongoing waterproof protection.
- Should I hire a professional for basements? For active leaks or complex foundation issues, a professional assessment is advisable, though many products are designed for DIY use.
- Are these products compatible with tile installations? Some membranes are designed to work under tile; always check substrate compatibility with the tile and adhesive.