The screw jacks people are referring to are attached to a pipe. One end of
the pipe will bear on your foundation, the other end has a threaded rod or
screw. You will turn the nut on the screw pushing on the pipe/foundation
one direction and to the steel beam in the other direction. Some places
require you to tack weld the thread to prevent it from backing off, though I
think this is unnecessary. When you have reached the desired elevation, the
screw jacks are left in place and become your columns.


"Alan McKay" wrote in message
.. .
took 130 years for the floor to sag. Don't lift it all in a day. I'm
not
sure what the recommendations are, but I do know to go very slow and
take a
tiny amount each day to avoid cracking stuff.

Yes, I realise I have to do this.

But again my original question : how to manage the jacks?
Do I build up a pile of wood 'cross-hatched' til the jack just fits
on top the wood and under the i-beam? Or if not, what?