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Old 05-02-2009, 12:16 AM   #16
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Cutting out a concrete basement floor


Just a thought, but instead of digging down, have you thought about going up. It's possible to raise the house up a foot or two, install additional foundation wall block, and set the house back down...and bingo, 8 ft basement ceilings, no footing issues, and the add on basement will match up. Just a thought.

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Old 05-02-2009, 07:31 AM   #17
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Cutting out a concrete basement floor


I'm a neophyte here so to speak therefore just throwing out something that may be way way off base to your current question and plans.

If you go through with removing the floor etc.. and in addition thinking of future expansion plans it seems you are really rebuilding the house. Therefore what about demolishing the home and building a new one? I am throwing this out because it keeps you in the same location which apparently is key in your case and you get a clean start vs working around alot of preexisting issues.


Just a thought based on knowing nothing about the cost associated with demo and new build in your area.
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Old 05-02-2009, 08:50 AM   #18
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Cutting out a concrete basement floor


there is no way a contractor is going to tell you how to do the job and then let YOU do it. if it fails (water, collapse, cracking etc.) and you sue him? the job you speak of is too critical.

the only person that would take such a liability is a structural engineer. it is 400 to 600$ for consultation. and you will need permits and city inspection. so get them involved early, let the city know who your engineering firm is that you hired.

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Old 12-01-2009, 06:35 PM   #19
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Cutting out a concrete basement floor


Hi I have done this and gone down two feet in my basement. The best way to do it by yourself is with underpinning the existing walls. I excavated the perimeter of my slab around 1 foot in width and made a 2 and 1/2 by 7 foot form and did seperate underpinning pours by working my way around the complete basement. What is great about this method is you only remove the dirt between the slab and the wall just before you do each pour so at anytime only 7-8 feet of area is technically unsupported. It also allows you to use the existing slab as a brace for the concrete form. After working my way around the basement ( took me approximatley 4-6 yards of concrete that I mixed) I then removed the whole slab and excavated down a 16 inches. After that I had a 4 inch slab poured per code and I gained a foot of headroom and now have 7 foot ceilings which is great. I don't see much of a need to go 8 feet but if you wanted to gain 8 feet I would suggest a combination of he underpinning / excavation and possibly looking into sinking your first floor beams and joist hanging the floor joists if they haven't been done this way. Consider also you will need to remove a lot of material. The slab is a project itself but the dirt below is a complete other ball game and you need to consider the material you are dealing with. You could run into rock,clay old debris concrete footings, ledge etc. Your slab may also have wire mesh in it which will be a pain to deal with. You will also need to pour lower footing for new lally columns. It can be done but it won't be easy. I did it all myself with the exception of pouring the slab which was only 15x 32 feet. I started the underpinning and excavation in May of 09' and finished last month. All being done nights and weekends. So be prepared for the worst.
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Old 10-16-2010, 04:48 PM   #20
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Cutting out a concrete basement floor


Your project may already be underway but I want you to know that your job should only be done in sections. Depending on your area, time between sections could vary though it had always been my understanding that opposite sides can be done at the same time so a small job like yours might take three cycles.
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Old 10-19-2010, 04:20 PM   #21
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Cutting out a concrete basement floor


Trailcharger, you don't happen to have pictures of this do you?
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Old 01-17-2012, 08:51 PM   #22
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Cutting out a concrete basement floor


Hey Jeff,

Just wondering if you ever tackled your basement project. I am considering breaking up my basement slab, digging out a bit, and repouring a new slab with radiant floor heat. I would like to see that someone else has done it successfully.

Dan

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