Shop in basement, keeping out the water

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Topic by crank49 posted 01-18-2012 11:15 PM 3145 views 0 times favorited 1 reply Add to Favorites Watch
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9 posts in 3462 days

01-18-2012 11:15 PM

Topic tags/keywords: question block curb wall seal blocks to slab

My wood shop is going in my basement.
My basement is 50% ground level, with a drive in garage under one end of the house.
The shop is on the other end of the house, the part that is under ground level.

The moron who built the foundation put in a french drain; about 12” above the level of the slab.
When we get about a week of steady rain and the ground gets completely saturated there will be some weeping of water into the basement. I can open all the doors and it will flow out through the garage and out into the driveway. Then I have to run fans and a dehumidifier for a few days to dry everything out.

I have lived here for 33 years and have had about 10 times there was an inch or so of water in the basement.
I can’t afford to dig up the yard around the basement to lower the drain to where it should have been.

I think I can re-seal these block walls with a product like Thoroseal. Then drill holes in the blocks at floor level. That will keep the walls dry and let the water drain out. Then I want to install a curb wall, 2” away from the foundation wall to catch the water that drains out. I will make this curb out of solid 4” x 8” x 16” cap blocks. It will be 8” high an I will build a framed stud wall on top of the curb. This curb will have to be continuous around the perimeter walls and out to the garage doors wher any water that comes in will drain away.

Now for my question.
What is a good product to seal this curb wall to the concrete slab floor. And to seal the blocks to each other?

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139 posts in 3411 days

01-19-2012 06:13 AM

As you have found the best way to keep water out is to provide a place for it to flow and water does flow downhill. If you get the water inside the basement it needs a place to flow into and then a pump can move it out. I am not sure concrete blocks are something you can seal very well. The floor needs to be sloped so the water can flow to a sump. If you use blocks then you need to fill them then you might be able to use a sealer on that. The sealers are a water resistant paint and it really doesn’t fill holes that are in blocks. If you are looking for something to seal the joints between the blocks you might try polyurethane caulk. This is a good product that doesn’t harden but it will get firm. You can push it in some with your fingernail. I have been watching some on the front of a building since 1995. It is a good product and moisture activates polyurethane glues and caulks. When I saw this company using this product to seal ledger stones in place on a parapet wall I thought it was a sorry thing to do but it has impressed me.

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