Crumbling Concrete Floors: How to Repair
LESLIE: Mary in North Dakota needs some help with a concrete floor. What can we do for you?
MARY: We’ve got crumbling concrete on the basement floor after water problems this spring.
TOM: OK. Alright.
MARY: And it’s very crumbly and powdery. And there are places on it that I’d like to paint, if I could.
TOM: Mm-hmm. Do you want to try to stabilize the deterioration of the concrete?
MARY: Yeah. I was wondering if there was some kind of sealant that could be sprayed or poured on it.
TOM: Yeah, absolutely. First of all, in terms of the water problem, is this a problem that happened after a heavy rainfall?
TOM: Alright. So if you’ve got water that comes in after a heavy rainfall, I want to make sure we try to slow this down so it doesn’t happen again. Adding sump pumps, things of that nature, is not going to stop this from happening again. What stops the heavy rainfall from getting in is outside, looking at your gutters and your grading, making sure the downspouts are discharging away from the house, making sure your gutters are clean, making sure soil slopes away from the house.
We’ve got extensive articles – actually, several of them – on MoneyPit.com. Just search “how to stop a leaking basement” and it’s the same advice. And we talk about the proper drainage improvements. So, do that first.
And then, in terms of the concrete itself, you can use a patching compound. QUIKRETE has a patching-compound product. You definitely want to use the patching compound because it’s designed to stick to the old concrete. If you try to put new concrete over it, it’s not going to stick. So, the ready-to-use patching compounds are trowel-applied. They’re latex formulas, so it’s easy to clean up. But that will seal the old concrete.
Then, once that dries, then you can paint it. And what I would look for is an epoxy floor paint. The epoxy paints I like because they’re a chemical cure. When you buy the floor paint, you get the paint in a gallon can that’s about three-quarters filled and then a quart of hardener. You mix them together, stir them up and then you apply the paint. Sometimes, there is an additive that goes in after the fact that gives you some texture to the floor, helps kind of hide the dirt. But patching it first, then adding an epoxy paint will have that looking like new in no time.
MARY: OK. But the name of the sealant was called what?
TOM: QUIKRETE – Q-U-I-K-R-E-T-E. It’s QUIKRETE Concrete Patching Compound. Good stuff. Mary, thanks so much for calling us at 888-MONEY-PIT.