How to Waterproof a Damp Basement Floor

primer for a basement floor
What You'll Need
Waterproofing agent
Safety glasses
Paint roller
Wet/dry vacuum

If you have a damp basement floor, you need to waterproof it to ensure that your house safe and that you are able to use your basement. Failure to do so can mean structural damage to your property. It’s not difficult to waterproof your basement floor and walls. You don’t need to hire a professional and spend a great deal of money to do it. Just follow these 4 easy steps.

Step 1 - Cleaning

Before you can start waterproofing your basement floor, you need to make sure it’s clean. Clear everything from the floor until it’s bare. Use your broom to sweep thoroughly, being certain to clear everything from the corners and crevices.

When you’ve done that, use a wet/dry vac to continue clearing any small items you might have missed. To complete the cleaning part of the process, mop the floor with clean water. That way you’ll be certain there’s nothing on the floor that can stop the waterproofing materials from bonding to the concrete. Make sure no one enters the basement and leave the floor to dry completely.

Step 2 - Filling

Now the basement is clean and dry, inspect the walls and floor for cracks. Fill the cracks with concrete. Let it dry, and sand it until it’s smooth. Repeat the vacuuming and mopping and let the basement dry again.

Step 3 - Primer

Once the area is dry you can apply the primer. Use a good waterproof primer that’s intended for basements. Be sure you follow the instructions on the primer. It might need to be diluted. Apply it with a brush in the corners and around the edges, then use a roller for the main areas. You only need to use a single coat of primer on the damp basement floor. Once you’ve finished, leave it to dry completely before proceeding. Clean the brush and the roller to remove all the paint.

Step 4 - Waterproof Agent

With the primer dry, you’ll be ready to apply the waterproof agent. As with the primer, use a brush for the edges and corners, and a roller for the open area. Apply a good coat of waterproofing agent to the area and leave it to dry.

You’ll achieve better results if you apply a second coat of waterproofing agent to the basement. The aim is to prevent dampness from returning, so the coverage needs to be complete. Any small gaps can allow moisture to enter, thus defeating the entire purpose of the project.

After the coats of waterproofing agent are dry, inspect the area visually to spot any areas you might have missed. Pay close attention to areas surrounding the door and other openings. These measures will take care of your damp basement floor and turn your basement into a useful room again.