Adding Slab To Slab - Building & Construction - DIY Chatroom Home Improvement Forum

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Old 03-31-2011, 08:08 AM   #1
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Adding slab to slab

I am thinking of buying a 24' x 34' house built on a slab foundation and want to add a 17' x 34' ell that would also be on a slab foundation. Can the slabs be joined so there will be no shifting over time?


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Old 03-31-2011, 10:17 AM   #2
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Yes, but...


It is possible to install a new slab next to an old slab so that there will be no appreciable shifting in the next 100 years or so.

You may well have a hard time avoiding an eventual crack between the two, and there are any number of problems/concerns that might have to be managed depending on your specifics.

Essentially, it can be done.

Have fun,



RDG Read Development LLC
Portland, OR
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Old 03-31-2011, 10:24 PM   #3
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I'd suggest that it is structural engineer, or very experienced concrete installer, time. You will probably be tying slabs, foundation walls and footers together, using rebar, a concrete drill, and epoxy. This, as mentioned above, is not a huge deal, but it needs to be right.
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