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Started By
Message
Pouring a new home slab over an old one
Posted on 9/16/21 at 7:57 pm
Posted on 9/16/21 at 7:57 pm
Ok so my parents home will need to be demolished because of Ida.
My wife and I had been preparing to build ourselves a home.
My parents don't want to rebuild especially anything big because they are up in age and have health issues.
We are planning to build in their place and add them an apartment to our home.
Would it be cheaper/easier to pour our slab over theirs, our home will be bigger so it would cover completely.
Or is it cheaper /easier to have the full slab removed and have dirt hauled in and let it sit?
My wife and I had been preparing to build ourselves a home.
My parents don't want to rebuild especially anything big because they are up in age and have health issues.
We are planning to build in their place and add them an apartment to our home.
Would it be cheaper/easier to pour our slab over theirs, our home will be bigger so it would cover completely.
Or is it cheaper /easier to have the full slab removed and have dirt hauled in and let it sit?
8
Posted on 9/16/21 at 9:14 pm to TigerDat
quote:
Would it be cheaper/easier to pour our slab over theirs, our home will be bigger so it would cover completely.
Or is it cheaper /easier to have the full slab removed and have dirt hauled in and let it sit?
If you want to do it right, remove the old slab and prepare the earth beneath. You’ll have plumbing and other things in the sub grade that you’ll have to install before pouring the slab.
You shouldn’t have to “let it sit” though. You can proof roll it and get adequate compaction.
Posted on 9/17/21 at 7:38 am to TigerDat
have the full slab removed and have dirt hauled in and let it sit
Posted on 9/17/21 at 8:01 am to TigerDat
You probably would have to get the existing slab tested to make sure you can go over it. If you can, you'd have to haul dirt in regardless to pour a new slab. If your wallet can swing it, I'd probably get it removed and start fresh on a new pad. I know in the back of my head I'd always wonder if it was ok. But that's just my weird thinking.
Posted on 9/17/21 at 8:22 am to TigerDat
The problem isn't the existing slab per say...that's compacted over time and will serve as a great base. Depending on your layout that will extend further you'll need to build up the soil, run new plumbing, sewer, etc...
It may be less of a headache and peace of mind to have the existing slab demoed and completely re poured to your new design.
Also you'll have the chance to raise the top of slab based on flood elevation.
It may be less of a headache and peace of mind to have the existing slab demoed and completely re poured to your new design.
Also you'll have the chance to raise the top of slab based on flood elevation.
This post was edited on 9/17/21 at 8:24 am
Posted on 9/17/21 at 9:10 am to TigerDat
If it was me, that old slab would absolutely be the floor of the crawl space of new home.
And I would absolutely have a safe “room” built in, where the family could go into a closet and disappear below a hatch in the floor in case of emergency.
That’s just me, though.
And I would absolutely have a safe “room” built in, where the family could go into a closet and disappear below a hatch in the floor in case of emergency.
That’s just me, though.
Posted on 9/17/21 at 11:43 am to TigerDat
Unless you take their plans and add on to the sides and not up you can expand the existing slab. Otherwise it's gonna be too much of a hassle trying to work around the existing.
Posted on 9/17/21 at 11:54 am to TigerDat
My parents home burned in 2010. 3rd story attic and all of second story completely gone from fire (started at chimney top on one gable). Entire second floor completely destroyed by water fighting fire. Total loss so they ended up demolishing it. They hauled off everything but the slab. After that, they used the excavator to break it up and bury it. Hauled in a few loads of dirt on top of that and rebuilt a new layout in the same spot. No issues to this day.
I dont think it would be a problem to build on top of it without breaking up and burying but the new house would be 3-4’ higher than the existing finished floor elevation.
I dont think it would be a problem to build on top of it without breaking up and burying but the new house would be 3-4’ higher than the existing finished floor elevation.
Posted on 9/17/21 at 1:07 pm to TigerDat
I know it can be done, just not sure economically and efficiently if it's worth the headache have an engineer come and re-engineer the slab in my new plan.
Or just haul off the old slab and move dirt.
Or just haul off the old slab and move dirt.
Posted on 9/17/21 at 1:09 pm to CootDisCootDat
quote:
dont think it would be a problem to build on top of it without breaking up and burying
I'm not talking about burying. I'm talking about pouring the new slab directly over the old.
I do know in research and speaking with some people, it is completely possible, would require minimum 4" thickness of new slab.
Just not sure economically what's better
Posted on 9/17/21 at 1:16 pm to TigerDat
quote:
I do know in research and speaking with some people, it is completely possible, would require minimum 4" thickness of new slab.
We’re not talking about a patio or driveway. A house has rebar, mesh, footers, plumbing, and electrical all in or below the slab.
If your slab has a slab beneath it, it will impede many of these things from being in the correct location.
Posted on 9/17/21 at 1:40 pm to LSUtigerME
quote:
If your slab has a slab beneath it, it will impede many of these things from being in the correct location
Not as long as the slab is poured thick enough to compensate for the space, as I've said I've done some research speaking with some who have some experience with it.
Posted on 9/17/21 at 2:10 pm to TigerDat
Economically speaking, thicker concrete won’t be the cheapest method…
Posted on 9/17/21 at 2:17 pm to CootDisCootDat
quote:
Message
Pouring a new home slab over an old one by CootDisCootDat
Economically speaking, thicker concrete won’t be the cheapest method…
That's what I'm thinking too, just wanted some other opinions than what I have gotten already
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