New addition old footing problem
I am looking at adding a addition to a 70 year old house, I am required to place my new footing 4 feet below grade..
The orgional house footing were placed just below the sod.
How would I go about shoring up the old footing before I place the new one's for the addition..
http://www.cincidubs.com/2867%20Fisc...nderpining.jpgYou will need to underpin the current footing. This will need to be done in 4'-0" length increments. You will also need to have this done by a professional and will need a building permit of course.
My detail is just an example of how it was accomplished on a house addition I recently designed. My structural engineer came up with this solution but it is not to be used by anyone on any other project except the one it was originally designed for.
My example was lowering a footing so that the new basement, which was lower than the existing basement would work.
I must say excellent post, I can see the problem you had while putting in the basement.
I assuming the the underpining was solid concrete and rebar was added alowing rebar to stick out for the next section of underpining..
I was orgionaly thinking of putting jackscrews at 4 foot intervals ( I have all kinds off access to steel) and underpining and leaving them in the concrete.
I need to talk to my GC and the inspector to see what they would suggest...
Thanks for the excellent post and the new word underpinning
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