House Wrighting Without Headaches
(Page 6 of 6)
July/August 1987
By Buck Purlin
This jacking technique is often used when a foundation sill plate needs replacing and the joist ends are still good, or in some cases when a perimeter foundation needs repair and it's inconvenient to jack from directly below the beam. Because an exterior wall carries the full weight of floors and roof rafters, it's important to brace the temporary beam well and to use a doubled or heavier beam if you doubt the 2 X 6's load-carrying ability.
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With the floor joists lifted, they'll either separate from the sill or the sill will rise from the foundation, providing a bit of working room. Replace the sill where needed, fix and level the foundation, then fasten the sill back in place with lag bolts and masonry shields. After jacking the floor back down again, be sure to toenail the joists firmly in position.
Stoop to Conquer
If you're anything like me, the most time you ever spent under the house was when looking for the garden hose. But given the opportunity to save perhaps thousands of dollars while learning something about one of your biggest investments, it wouldn't hurt to take a hard look at what's happening under the floor you walk on. Just be careful, and please—think before you act.
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