Cinderblock exterior foundation with black sealant coated on top

Home Foundation Sealing

Time To Complete

48 hours

Difficulty Level

Beginner

Products Needed

Foundation repairs and waterproofing can be an easy fix. Application of Liquid Rubber Foundation Sealant/Basement Coating cures into a seamless waterproof membrane that protects against future potential cracks and leaks. Use on concrete, wood, insulated concrete forms (ICFs) and cinder blocks.

What You'll Need

Prepping Your Space

Step-By-Step Walkthrough

What You'll Need

Products You'll Need

Foundation Sealant Basement Coating

$59.95 - $1,795.00

Geo-Textile

$34.95 - $64.95

Purchase Everything You Need For This Project

Not Sure How Much To Order

Prep Your Foundation

Get Your Supplies Ready

A successful project starts with preparation. Make sure you have all the supplies and products you need with our supply checklist.

Download Supply Checklist

Clean Your Space

All surfaces must be structurally sound, clean, dry and free from contaminants that would prevent proper adhesion. Cracks, joints, voids, etc. (1/8” or larger) should be pre-filled with a suitable patching material such as a high-quality wood filler or concrete patch. Use Liquid Rubber Sealant & Adhesive for gaps and cracks. Foundation Sealant can be applied over aged solvent- based existing coatings. Grind sharp edges and remove flaking material. If you have deep cracks, fill with a Crack Injection Kit an be sure to consult a professional to make sure the foundation is not damaged. Test compatibility before applying Foundation Sealant, Waterproof Sealant or Color Sealant. Multi-Purpose Primer may be required to bond to the existing coating.

Contain The Mess

Set out a tarp or large piece of cardboard to keep all tools and containers on when you are not using them. Have a pail of soap and water, rags and mineral spirits ready in case there is a spill. If a spill happens, use rags to soak it up, cleaning immediately with soap and water. If it is dried, use a razor/scraper to remove. Use mineral spirits to weaken the material and remove with a wire brush or grinder.

*Note: Use mineral spirits sparingly.

Step-By-Step Project Walkthrough

Tip From The Pros:

Apply each coat in an alternate direction to the last coat to ensure even coverage.

Download Full Application Guideline

Prepare Your Space and Gather Your Materials

Make sure your surface is totally clean, dry, and free of all matter. Gather all the products you’ll need. Do an inspection and cleaning of the area.

Detail Work

Liquid Rubber 3-Course-Method: For all cracks less than 3mm (1/8’’), cold-joints, non- monolithic inside/outside corners, pipes, wall/slab, wall/footing and wall/wall junctures apply a thick 6’’ wide coat and embed 4’’ wide Geo-Textile reinforcement fabric followed by a second coat (known as the 3 Course Method). For all cracks greater than 3mm (1/8’’) fill with backer rod, spray foam, expansion joint caulking or patching materials prior to 3 Course Method. Ensure the surface is smooth and flush and that patching materials have cured as per manufacturers recommendation prior to application of your Liquid Rubber Solution.

Masking

Tape-off, block-off, or otherwise mask area’s that are not to receive Foundation Sealant.

Prime

Multi-Purpose Primer may be required to bond to the existing coating. A test patch is recommended to confirm adhesion prior to full application.

Apply Coating

Apply Foundation Sealant when temperature is 10ºC/50°F and rising. Use a brush, roller or heavy duty hydraulic piston spray rig (very thick/viscous material) at a final coverage of 20 ft² per G (1.9 sq/m) or 100 ft² per 5G pail (40-60 mils, 1-1.5mm). Generally you can apply 2 heavy coats per day. Apply next coat when dry to touch, is uniform in color and nothing is wet underneath. Tacky is OK. Apply all recommended material. Membrane should be a minimum of 12” above finished grade and down the base of the slab/footing.

Tip From The Pros:

APPLY NEXT COAT WHEN DRY TO THE TOUCH WITH NOTHING WET UNDERNEATH AND IS UNIFORM IN COLOR.

Inspect and Protect

Inspect for pinholes, blisters, voids, thin spots or other defects. Repair as necessary. Allow 48 hours to dry before backfilling. It is recommended to apply protection board or drainage board to protect your coating from other trades and work, during backfill, and from thermal expansion and contraction during its life.

Clean Up

Remove tape while coating is still wet and close container to secure leftover product. If spillage occurs, soak up as much material as possible with rags. Clean immediately with soap and water. If spill is dried, scrape off as much as possible with a razor or scraper. Use mineral spirits to weaken product and an appropriate tool such as a wire brush or grinder to mechanically remove. If splashed on the skin immediately wash thoroughly with fresh water. If the product has dried on the skin massage the area with medical grade mineral oil, baby oil or edible oil, then wash with soap and water. If irritation persists seek medical attention.