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Old 05-13-2014, 11:04 AM   #16
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How to keep river out of basement?


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Originally Posted by Ed Ferris View Post
Since the house was built in 1896, it really doesn't have a slab. Where the previous idiot broke out the basement floor to make a sump the cement (no aggregate) is less than one inch thick. When the water does drain out you can see the cracks in the floor are still wet.
As the current idiot, I didn't think of the fact that keeping the water out will put pressure on the brick basement walls. I suppose I'll have to let in pour in and pump it out like all my neighbors do. Or just give my kid a toy boat and let him play in the basement. The furnace is already up on bricks -- that should have told me something.
Thanks for the help.
Put in some heating or cooling.... indoor hot tub or ice skateing rink...???

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Old 05-14-2014, 11:14 AM   #17
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How to keep river out of basement?


Had the skating rink last winter. Surprised that it didn't crack the walls.
There's an outdoor hot tub and what seems to be its pump/heater is attached to the basement wall -- above water level.
They didn't have sump pumps in 1896, did they? If this has been going on for 118 years without destroying the foundation I probably don't have to fix it now.
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Old 05-17-2014, 07:41 AM   #18
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How to keep river out of basement?


my old house still stands in upstate noo yawk,,, laid up stone foundation/walls,,, no conc footer underneath, either
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Old 06-14-2014, 01:47 PM   #19
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How to keep river out of basement?


The water is pushing up with 30 psf, but the weight of the basement floor is pushing down. Since concrete is denser than water, four inches of concrete weighs more than six inches of water. So if I pour that much concrete into the basement, on top of a layer of hydraulic cement for waterproofing, there should be no upward thrust, no flooding, and no need for a sump pump. Right?
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Old 06-14-2014, 02:06 PM   #20
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How to keep river out of basement?


Whether you get flooding or not has to do with whether the water table is higher or lower than your floor. If the water table is higher, you get flooding, unless of course you pump out the water with a sump pump.

As to the net pressure on the slab, you are correct, the slab weight acts downward, the water pressure acts upward, and the net force on the slab equals the difference. Concrete has a unit weight of about 150 lbs/cubic foot, so each inch of concrete exerts about 12.5 pounds per square foot downward. So a six inch thick concrete slab (unusually thick for a basement) equals about 75 psf, which is about the same as 14 inches of water.

Of course, if the water table is say two feet higher than your slab, you are back to the old problem of two feet of water equals 125 psf minus 75 psf from the slab, net pressure equals 50 psf up, slab cracks.
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Old 06-14-2014, 04:48 PM   #21
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How to keep river out of basement?


dan's exactly right - putting more conc down won't stop water no matter how many psf's you guys toss back & forth when you consider a home's bsmt is like a ship's hull below the waterline, its sometimes easier to understand the problem

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