Caulk for concrete floor

Eh, we are getting pad and carpet installed over a bare concrete floor. It has some cracks in it. They are not getting bigger. The installation is in three days.

I’m not worried about the cracks per-se, but the radon gas that could leak through them (we have not had a radon test)

As a “Well it can’t hurt ‘fix’ (I use fix loosely)” I thought I would fill the cracks with caulk. Probably doesn’t matter, but what do you folks think, silicone or latex? I don’t really see a benefit either way.

I’m in NO way thinking that this will keep the cracks from spreading.

May have answered my own question - Concrete crack filler.

Yep, I was just about to post something similar – masonry crack filler sounds like the product you want.

What they said.

Have you considered a vapor barrier on top of the concrete (and under the carpet+pad)?

Will help with moisture transfer and radon:

ETA: that link was for under the slab. Here’s one for over:

Over is really for cases where you’re sure there’s no vapor barrier under the slab :wink:

ETA2: another cite:

Crack filler isn’t necessarily permanent. When I’ve used it on driveways and patios, it eventually shrinks and separates from the sides of the cracks. That’s not such a big deal on a driveway, but it may matter if you’re trying to block gases from rising up.

I saw that in my mom’s driveway.

I’ll have to think about that. Thanks.

this is true, but in a temperature controlled basement, you don’t have to worry about freeze and thaw cycles, and thus, while not technically “permanent”, you should not have these types of issues in this application.

Thanks everyone. Going to sell the place in a year or two. I suspect they will do a radon test :grimacing: We should have done one years ago, life got in the way.

This is so backwards it hurts. Get the baseline radon tested before you schedule the carpet and padding and before your mitigation attempts.

Yes, I understand. If we have to pull up the carpet, so be it (It’s one room).

The carpet is coming Monday. So no time for a test at this point. Should have thought of it sooner. My Wife just brought it up this morning. She’s an appraiser, so she deals with this stuff. That’s not my field at all.

Are you in an area where radon is a common problem?

Heh, I suppose that’s one of the ONLY reasons to skip the radon testing: you can’t disclose what you didn’t know.

Do you think the crack filler you haven’t bought yet will be dry/cured enough to be sealed under carpet in a few days?

Not from anyone I know. But maps say it is a problem in Colorado. We don’t have a basement, this is a slab on grade. I suspect that that might mitigate it some. If there is even a problem.

Yes I do.

He’s in Colorado, where – broadly – half of all homes have high levels of radon.

Instead of a test, or an active radon mitigation system, when you buy a home in Colorado, you get a brochure about radon – a document that few living human beings have ever read or will ever read.

At scale, requiring every new home to have an active mitigation system would cost very little. Lung cancer, on the other hand, is both costly and shitty.

I think the whole thing is just a wee bit insane, but … that’s just me.

Plus you work for the county and most CO county health departments will loan you a radon tester for free (you dingbat! :upside_down_face:)

Yup, my bad. They would. Never got around to it. Honestly, it may also be a situation where, I don’t really want to know. 32 years in this house with no ill effects.

I hear you–out of sight out of mind is a truism for a reason. Plus it’s not super easy to mitigate radon in existing construction that doesn’t have a crawl space. But it might become an issue when you sell as you are aware.

In Durango, if your house wouldn’t have a Radon problem naturally, the builders after WWII might have created one:

https://www.durangoco.gov/DocumentCenter/View/16139/Uranium-Mill-Tailings-Fact-Sheet

Yeah, we are going to sell, one way or another. Cross that bridge when we get there. I’ll just go with ignorance, since, I. Don’t. Know. The concrete filler is sort of a ‘Might as well’ as long as it’s exposed.