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Old 01-08-2011, 10:46 PM   #1
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excavate for foundation


I'd like to start a discussion on some ideas, techniques and options raising a house above grade for installing a concrete foundation for a 3 feet crawl space.
Let's assume the house exists on grade, measuring 28 x 28 feet and has to be raised 2 feet. There is no rot, solid ground and house is in good condition.
What is involved with excavating a trench for the (concrete) foundation with the house raised 2-3 feet? Even with a small machine it is difficult to dig a trench close to the house. Digging by hand is one option.
I have a restricted space for manovering machinery.

Len


Last edited by jeffjocegus; 01-09-2011 at 06:32 PM. Reason: change in design
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Old 01-13-2011, 08:16 AM   #2
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excavate for foundation


Lots to talk about. Pictures would be a good start. Current foundation?

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Old 01-13-2011, 04:37 PM   #3
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excavate for foundation


Not what you want to hear, but I once saw a house being excavated by the homeowner. It was up on cribbing until he backed his bobcat into the cribbing and the house fell in the hole. It remained at a 458 angle until the local authorities condemned it. Was a really nice house too!
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Old 01-13-2011, 04:42 PM   #4
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excavate for foundation


Raise the house onto 4 - 60 ft steel skids, slide the house out of the way, do the foundation, slide the house back over the foundation and lower. Remove skid and finish foundation in areas where skids were.
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Old 01-13-2011, 04:47 PM   #5
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excavate for foundation


Seems a shame to do all that work and not go with a full basement
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Old 01-13-2011, 04:49 PM   #6
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excavate for foundation


Very concise.
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Old 01-14-2011, 09:08 AM   #7
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excavate for foundation


Probably be easier to excavate a full basement under it than a 3 foot crawlspace. You'd only need access on one side and work the rest of the excavation from underneath. Pouring footers and building walls would certainly be easier.
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Old 01-14-2011, 07:56 PM   #8
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excavate for foundation


Yes, it can be done, and I'm thinking along the lines of doing the corners first in concrete block, stair stepped, up to the height you want, with wire in the mud. You can even lay two courses of block all around the house, then rent panels or buy plywood and rip so you'll have 2x8 lengths to work with. You can jack the house up a little at a time ,like in inches. If your floor joists and band boards are in good shape you'll have no problem, but focus on good support on solid earth underneath. If you never poured walls before ,be sure you have plenty of wall wire loops with rods running through and plenty down low. Even threaded rod works for the 8 inch way. A small roto tiller will help in the digging. This is based on a nearly flat lot. A good job for a dry August.

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