Hi roderink:
Just a few notes of caution
when lifting or jacking a timberframe structure what ever you do work all the way around and jack only at the pressure points like right under a vertical post.
I would by all means obtain some comealongs, and cable the frame on the lower level right close to the cross timbers of each bent.
Do not over tighten but just snug up and as you jack take it just an inch at a time at each jacking point.
Where the framework has sunk down the most it probably has loosened the braces, and maybe some have dropped out of their mortises try and put them back in their original places and hold them there someway until they tighten up.
I suggest having someone shoot a grade nail on each post, and then figure from this how much each post is down and go from there
It is no doubt that the framework at one time was fairly level and should come back to that point again---take it slowleeeee!!!
If you are not lifting it very much wedging it up with oak wedges will work . Start them under each post and then go around and tap them with a sledge hammer keep inserting them as required.
If you hear any cracking during the jacking process, you may have put too much strain on a timber at that point.
The timbers in the frame may not like being forced to return to their original positions, after being bent for may years, and you may need to jack only alittle each day for a week or more to allow the timbers to internally straighten out without cracking at critical points
NH
