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Old 12-26-2019, 02:04 PM   #1
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Default Epoxy on damp slab

Iíve stripped & ground my finished basement concrete floor in preparation for a slightly breathable epoxy coating before installing an inexpensive indoor/outdoor carpet.

I have a few very small spots on the slab which are perpetually and visibly damp which are likely due to sand and/or dirt filling the voids in the crushed bluestone fill beneath the slab. The moisture is bridging the fill not allowing the slab to dry. The damp spots donít even amount to 2 square feet in all.

Is there a product that I can spot seal the damp spots that will cure and can be top coated with a WB 2 part epoxy just to allow the epoxy to set? Iím not concerned with the epoxy popping off at some point in the future.
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Old 12-26-2019, 02:54 PM   #2
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Originally Posted by Alchemy Redux View Post
I’ve stripped & ground my finished basement concrete floor in preparation for a slightly breathable epoxy coating before installing an inexpensive indoor/outdoor carpet.

I have a few very small spots on the slab which are perpetually and visibly damp which are likely due to sand and/or dirt filling the voids in the crushed bluestone fill beneath the slab. The moisture is bridging the fill not allowing the slab to dry. The damp spots don’t even amount to 2 square feet in all.

Is there a product that I can spot seal the damp spots that will cure and can be top coated with a WB 2 part epoxy just to allow the epoxy to set? I’m not concerned with the epoxy popping off at some point in the future.

penetrating epoxy primer will displace some latent moisture, but its not in the specs to use it on damp masonry.



BM would spec corotech V156
https://www.benjaminmoore.com/en-us/...ooring-primers


Edit: I recall @Epoxy Pro mention this product a while back:

https://simiron.com/docs/MVB_Product_DataSheet.pdf

Last edited by cocomonkeynuts; 12-26-2019 at 03:02 PM..
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Old 12-26-2019, 04:39 PM   #3
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Not exactly sure what your expectations are, but have you thought about a thin coat of hydraulic cement over the affected area instead of a sealer? Not something I would necessarily do for a paying customer, but it could be an effective solution I'd be willing to try on a personal project.
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Old 12-26-2019, 05:09 PM   #4
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Not exactly sure what your expectations are, but have you thought about a thin coat of hydraulic cement over the affected area instead of a sealer? Not something I would necessarily do for a paying customer, but it could be an effective solution I'd be willing to try on a personal project.
Edit: My wrong. It appears there are hydraulic cements for 1/8” applications and I might very well try it. Thanks for the tip.

It’s happening where the perimeter French drains were installed and re-cemented by the previous HO. I chopped out a small section and there was dirt filling the voids in the stone fill which is serving as a pathway for the moisture. From what I had already looked into, hydraulic cement can’t be applied less than 2” thick. Aside from chopping out wherever the drains were re-cemented and removing the dirt, there really is no quick and/or permanent fix. Its probably only a few linear ft which is damp. I’m prepping the house to get it listed for sale and just noticed it after living here for 15 years when removing the old carpets. I don’t really have any long term expectations yet don’t want anyone to inherit what is only a minor dampness problem.
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Last edited by Redux; 12-26-2019 at 06:39 PM..
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Old 12-26-2019, 07:11 PM   #5
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Edit: My wrong. It appears there are hydraulic cements for 1/8Ē applications and I might very well try it. Thanks for the tip.

Iím prepping the house to get it listed for sale and just noticed it after living here for 15 years when removing the old carpets. I donít really have any long term expectations yet donít want anyone to inherit what is only a minor dampness problem.
Knowing you've recently retired and were contemplating leaving the area, I figured you were getting your home ready for market. Repairs have a tendency of popping up when you go looking for them.

I picture you roaming the country in a vintage '63 Airstream (with a green and white striped stow away awning) pulled by a fully restored '78 Suburban....with a lift kit, of course.

Good luck...on both the floor repair and the Airstream.
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Old 12-31-2019, 09:45 PM   #6
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Waterborne Armorseal.


Sherwin Williams. It will do what you need it to do. Dont overthink it.
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Old 12-31-2019, 10:27 PM   #7
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Can you core drill a small hole and either allow the moisture to evaporate, or fill and displace the water in the void prior to applying epoxy?
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Old 12-31-2019, 10:43 PM   #8
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Thanks. Itís done. I ended up using the Coretech that Cocomonkeynuts mentioned and it really worked out well.
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Old 12-31-2019, 10:51 PM   #9
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Thanks. It’s done. I ended up using the Coretech that Cocomonkeynuts mentioned and it really worked out well.
Awesome! Life's about the solutions, but it takes a problem.
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