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Old 07-04-2012, 08:22 PM   #16
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Pour concrete over sunken slab (floor)?


Yeah, that's what I thought. I'm not really sure how it's done in the US (I'm German), but from what I remember we pour the foundation and the slab together...

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Old 07-04-2012, 08:26 PM   #17
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Pour concrete over sunken slab (floor)?


The slab was never attached to the foundation wall,those were two seperate pours,it's how it's done,the slab subase was not properly installed and that's why you have the slab sinking,proper fix is tear out and repour,that is after a new base is put in.
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Old 07-04-2012, 08:33 PM   #18
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Pour concrete over sunken slab (floor)?


Im not sure I understand how this is usually done. Is there e.g. rebar in there? Does the rebarvconnect the foundation to the slab? If not, why not? Shouldnt that prevent it from sagging? When I tear it out, and theres no rebar connecting to the foundation, how do I know the new soab doesnt do just what the old did?
Just trying to understand...
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Old 07-05-2012, 09:46 AM   #19
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Pour concrete over sunken slab (floor)?


One way to couple the slab to the foundation is to drill into the foundation and use epoxy to attach rebar into it. Then couple those protruding pieces to the rest of the new slab's rebar grid.
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Old 07-05-2012, 12:07 PM   #20
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Pour concrete over sunken slab (floor)?


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Originally Posted by ThomasC View Post
Im not sure I understand how this is usually done. Is there e.g. rebar in there? Does the rebarvconnect the foundation to the slab? If not, why not? Shouldnt that prevent it from sagging? When I tear it out, and theres no rebar connecting to the foundation, how do I know the new soab doesnt do just what the old did?
Just trying to understand...
No there is no rebar in the slab,wire mesh is used in place of rebar,and the slab is not connected to the foundation,it's a floating slab.

Have you thought of putting a plywood sub floor on sleepers down,rather than tear out the existing floor?
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Old 07-05-2012, 01:24 PM   #21
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Pour concrete over sunken slab (floor)?


Yeah, I wondered about the plywood option, but wasn't really sure how I can get the plywood level. If I could do that, it'd be the best solution in my opinion, since it doesn't add much weight to the slab.
Would I just put some shims directly under the boards? How do you usually attach the plywood to the concrete, glue it? Nail it?
What would also be good for that solution is that the addition where the problem is has domed ceilings, about 10-12ft high, so raising the floor wouldn't really be an issue space-wise. Only problem is that the rest of the house would be slightly lower then, though.
Or I could make an actual raised floor with 2x4 or something, and make a step between the main house and the addition. I might run into issue with the baseboard heating then, though...
Hm... lots to consider I have two companies coming in next week to look at it and give an estimate, so we'll see what they come up with.
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Old 07-05-2012, 01:55 PM   #22
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Pour concrete over sunken slab (floor)?


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Originally Posted by ThomasC View Post
Yeah, I wondered about the plywood option, but wasn't really sure how I can get the plywood level. If I could do that, it'd be the best solution in my opinion, since it doesn't add much weight to the slab.
Would I just put some shims directly under the boards? How do you usually attach the plywood to the concrete, glue it? Nail it?
What would also be good for that solution is that the addition where the problem is has domed ceilings, about 10-12ft high, so raising the floor wouldn't really be an issue space-wise. Only problem is that the rest of the house would be slightly lower then, though.
Or I could make an actual raised floor with 2x4 or something, and make a step between the main house and the addition. I might run into issue with the baseboard heating then, though...
Hm... lots to consider I have two companies coming in next week to look at it and give an estimate, so we'll see what they come up with.
The plywood i've seen installed was pressure treated and was installed on top of 3/4" 1"x4" sleepers which you could shim to level before you lay the plywood,then you would have a nice level surface to install whatever kind if floor you wish.

Forgot to say you should have a vapor barrier down before the sleepers,and you can use a ram set to attach the sleepers,then use screws to attach the plywood or liquid nails and screws, plywood should be tongue and groove.


Last edited by Canarywood1; 07-05-2012 at 02:05 PM.
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