Jacking up a house 7

[Robbiee]

Hello,
A contractor wants drawings for jacking up a house. The attached sketch explains his and my ideas for how to do it. The contractor has done only one similar job for a farm building. The reason for jacking up is two-fold: 1- to replace badly cracked foundation wall and 2- to raise the basement height by 16". My proposed sequence of work is:
1- provide the shoring beams in the basement as shown. Don't jack-up the house yet.
2- install the temporary lateral braces
3- demolish and rebuild the foundation wall one side at a time to the current height.
4-Jack-up gradually and evenly about 1/2" at a time to a height of 6" above the final height. Temporary braces to be removed during jacking up
5- Install two additional courses of blocks to the new height.
6- three days after installing the additional courses of block, remove lateral braces and Lower the house to bear on new wall.
7- Drill and install new anchors.
8- remove jacking system.
I am doing this for the first time therefore any input from you will be deeply appreciated. Thanks

 

[hokie66]

Dave,

Do you think you saved money by salvaging some of the old house as opposed to removing it and starting over?

 

[InDepth]

In the photos. Cribbing is a bit high for the lumber used. 4x and 6x cribbing you limit to 4ft and 6ft height for stability. Also usually you overlap a bit away from the ends (2-4") and nail to keep the cribbing together.

 

[cooperDBM]

Hokie,
Keeping the old house didn't save money. The value of keeping the old building was that it's location on the property line and the many large windows on one side are grandfathered. The lot is only 25' wide so a new building centered in the lot would eliminate the laneway, access to the back yard, and almost all of the side windows. After seeing a number of similar infills, including our immediate neighbour, we felt the old grandfathered house would be a lot more liveable.