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Old 01-11-2019, 02:46 PM   #1
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2nd Floor Cement Slab Removal


We are renovating a 2nd floor sitting room into a bedroom. As such, there was a wood stove and hearth that we wanted to remove.

Here is the original:
https://www.imgoat.com/uploads/ecca5b6365/184350.jpg

Normal builders would have built a plywood bix and surrounded it with brick. What do I find?

This:
https://www.imgoat.com/uploads/ecca5b6365/184352.jpg

Yep. A 4.5" slab (with rebar) on top of another several inch thick slab that is below the subfloor.

Q1) what in the hell is supporting ALL this weight?

Q2) how do i remove this slab? Im afraid to take a jackhammer to it because of damaging the ceiling below.
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Old 01-11-2019, 03:10 PM   #2
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Re: 2nd Floor Cement Slab Removal


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Old 01-11-2019, 03:22 PM   #3
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Re: 2nd Floor Cement Slab Removal


The floor was framed first and this is part of the chimney and they used the framing of the floor as forms but most of the support comes from the chimney.
The problem with only taking some out you are weakening it and what is left could fall thru the ceiling below.
Build a platform like a floor with 3/4" plywood and lift that up to the ceiling below and support that with posts to protect the ceiling.


When they poured this the added a 2x4 around the area flush with the bottom of the joists and put plywood in for the bottom of the concrete. On a good day you will find that the plywood is still there but most times it is removed. Inspectors like to see the bottom of the concrete.
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Old 01-14-2019, 09:44 AM   #4
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Sounds like this will not come out easily or without risk to the overall structure. Guess I just box it in. Thanks guys
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Old 01-14-2019, 07:24 PM   #5
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Re: 2nd Floor Cement Slab Removal


That's a strange one, the material directly below the stone hearth material is almost always concrete block or brick, which is relatively easy to remove.
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