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Garage Built In A Lake

 
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Old 03-30-2015, 03:52 PM   #1
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Garage Built In A Lake


Got a garage built in the middle of an existing slab with about a one inch lake in the center. The water is running into the garage through the saw cuts in the slab and possibly some under the plates as well. Any good way to remedy this?
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Old 03-30-2015, 04:06 PM   #2
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Re: Garage Built In A Lake


Cut in perimeter drains??

First guess off the top of my head.

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Old 03-30-2015, 04:15 PM   #3
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Re: Garage Built In A Lake


Quote:
Originally Posted by shanekw1 View Post
The water is running into the garage through the saw cuts in the slab and possibly some under the plates as well.
From a high groundwater level?

To check the refill rate you need to know the shape of the volume of water and the puddle diameter.
http://mathworld.wolfram.com/SphericalCap.html
(flip the image upside down)

Or maybe it's cone-shaped.


Is the slab perfectly flat? How much out of level are you allowed to make the slab by jacking a corner?

Last edited by GettingBy; 03-30-2015 at 04:25 PM.
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Old 03-30-2015, 04:34 PM   #4
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Re: Garage Built In A Lake


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Originally Posted by GettingBy View Post
From a high groundwater level?

To check the refill rate you need to know the shape of the volume of water and the puddle diameter.
http://mathworld.wolfram.com/SphericalCap.html
(flip the image upside down)

Or maybe it's cone-shaped.


Is the slab perfectly flat? How much out of level are you allowed to make the slab by jacking a corner?
No, not high groundwater, just rainwater. The slab is an inch low in the middle. The slab is also two feet thick, with solar panels and a giant boiler building on it.
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Old 03-30-2015, 05:26 PM   #5
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Re: Garage Built In A Lake


Channel drains, waterproof chamfer or tnt.

Pictures would be of great help...
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Old 03-30-2015, 05:27 PM   #6
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Re: Garage Built In A Lake


put in a sump pump and basket
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Old 03-30-2015, 08:10 PM   #7
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Re: Garage Built In A Lake


clean out the saw cuts leading out the front for the water to drain gets it out. first thought is filling the cuts with BASF NP1, but if it's coming under the sill plates and the concrete comes out too far, address infiltration first.
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Old 04-01-2015, 01:05 AM   #8
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Re: Garage Built In A Lake


Here's a couple pics. The low spot on the slab is near the middle of this wall and extends under the wall to the inside.

I told them cutting in channels to get the water flowing off the slab instead of pooling in the center was the best bet. They are going to call whoever poured this slab in the shape of a bowl to see if they will rectify it.

If it wasn't 2+ feet thick, I would have drilled a couple drain holes in it but there is no way I am drilling through a two foot slab.
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Old 04-01-2015, 06:04 AM   #9
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Re: Garage Built In A Lake


I saw a slab that held some type of electrical gear that had a swale ground into it for probably the same reason. It was about 18" wide and not difficult to walk on/across, it seemed to do the trick. Water never puddled again.
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Old 04-01-2015, 09:01 AM   #10
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Re: Garage Built In A Lake


Quote:
Originally Posted by shanekw1 View Post
The slab is an inch low in the middle.
Can you make it flat or give it a slight crown? Is it now low because of the weight of everything that is on it (when cured it was perfectly flat)?

Last edited by GettingBy; 04-01-2015 at 09:20 AM.
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Old 04-01-2015, 09:55 AM   #11
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Re: Garage Built In A Lake


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Can you make it flat or give it a slight crown? Is it now low because of the weight of everything that is on it (when cured it was perfectly flat)?
Being that the slab is @ 30 x 50 and 2 feet thick, with the part under the sea can in the pic they say is 4 feet thick, I doubt anything is moving it.
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Old 04-01-2015, 10:48 AM   #12
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Re: Garage Built In A Lake


I don't think you want drain holes or you'll slowly wash out the soil under the slab. It would be better to keep the water out in the first place. How about flashing under the exterior wall in conjunction with a water-tight curb that will keep water from getting under - and/or soaking through - the bottom plates?
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Old 04-01-2015, 05:57 PM   #13
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Re: Garage Built In A Lake


I'm not sure what kind of rules and regulations you have to follow, but if you can't:

1) Move the slab

2) Resurface the slab to correct pitch

then you'll have to give the water a path of less resistance to drain by cutting a drain into it.

I can suggest 2 things:

A) A trench drain




or B) Use a concrete saw and cut a couple of parallel long slits into the concrete then chip it away to make a little trench drain out of the slab itself.

I'd go with A personally
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Old 04-01-2015, 07:01 PM   #14
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Re: Garage Built In A Lake


Quote:
Originally Posted by Obi Wan Cannoli View Post
I'm not sure what kind of rules and regulations you have to follow, but if you can't:

1) Move the slab

2) Resurface the slab to correct pitch

then you'll have to give the water a path of less resistance to drain by cutting a drain into it.

I can suggest 2 things:

A) A trench drain




or B) Use a concrete saw and cut a couple of parallel long slits into the concrete then chip it away to make a little trench drain out of the slab itself.

I'd go with A personally
Did you miss the part where its 2' thick and 4' thick in places?
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Old 04-01-2015, 07:03 PM   #15
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Re: Garage Built In A Lake


Quote:
Originally Posted by rrk View Post
Did you miss the part where its 2' thick and 4' thick in places?
Good thing he doesn't have to cut all the way through.
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Old 04-01-2015, 11:49 PM   #16
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Re: Garage Built In A Lake


Survey the low spot(deepest water in the catfish pond) saw a groove/kerf to daylight with a walk behind floor saw using a laser to level the "ditch" botttom, angle cut sides. cash check.

The tough part is keeping trash out the ditch during dry spells/

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