Well after doing the navy seal crawl up under the house we found that the joists that were supporting that floor were not actually attached to the sill plate any longer as seen in the photograph below.
How to jack up house floor.
Get a hydraulic jack.
As the house moves add smaller blocks to support the center of the structure at the new elevation.
Jacking up a floor and leveling it is easy with these simple instructions.
Jacking can mean different things.
Buy or rent a hydraulic jack.
If the foundation is sinking then you need to jack up the sinking side.
Get underneath your house and look for the support beams that hold up the house.
Learn the proper way to install temporary support posts and jack up a sinking house.
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Remove the hydraulic jack once you attain a height that gives you adequate room to replace the rotten sill plate under your garage.
When the space above the temporary post is adequate to place the jack and reach the structural member above start jacking the house up.
The sagging floor was the symptom and somewhere under the house there had to be a cause.
You can either buy or rent a hydraulic jack to lift the house.
While few of us are interested in jacking up an entire house complete with cribs girders timbers and everything else you need in order to lift a house off the ground there are a number of foolhardy souls among us who feel the need to jack up a portion of the house in order to insert an extra tier or beam for repairs or to level an old sloping floor.
This is a great way to correct problems before installing a permanent so.
Look for bowed beams that are sinking lower than their compatriots or places where a sagging floor above may mark a problem beam below.