05:38PM | 07/30/03
Member Since: 07/29/03
1 lifetime posts
I am getting ready to jack up some seriously sagging floors in an old row house we just purchased. I have some experience jacking up houses with hydralic jacks and house jacks but never from the basement. The row house is narrow with only a 13 foot span. The floor sags quite a bit over the 13 foot span on one side of the house/foundation. The floor joists are old 3X10s spaced about 18" apart and are in excellent shape. They sit on a ciderblock and brick foundation wall. The first 5 feet of the row house isn't bad but then it begins sagging rather quickly to a maximum of 4 1/2" at 35 feet back and then up slightly to 3 1/4" at 55 feet back. The second floor follows this pattern but it is not nearly as bad. It looks like the foundation just sank on one side of the house. I understand from the previous owner that it has been this way for at least 50 years!

I was planning on digging new footings along the entire wall in the basement as needed, raising the house (very slowly of course) on a beam running the entire length of the house placed along side the existing foundation under the joists and then enclosing the new posts in a wall.

I have a number of questions. First, I am not sure what kind of jacks are best to use (there is 6 feet from the basement concrete floor to the bottom of the joists)? Can I use screw jack posts that you buy at home depot? Is there anything better to use. If I use these to jack up the house, can I leave them in place as the posts? Does anyone know a simple formula for figuring out how many posts you need over a fifty foot span in a two story row house? I was planning to sister 3 2X12's for the 40-50 foot beam. Does anyone have a better idea?

Any help is appreciated on this one.

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