On Dec 10, 7:40 am, "David L. Martel" wrote:
Chris,

Sounds as if the central supports have failed. Does your house have
central supports? If not, why not? If yes, why have they failed?
Most probably someone built the house without central support and the
house has sagged as you describe. If that's the case you'll need to add
central supports. These can be the jack posts that everyone has already told
you about. The jacks need to be supported by some sort of foundation.
A civil engineer can tell you how many jack posts, where to place them
and what kind of foundation. Or tell you why the house is sagging. You'll
find engineers in the phone book.

Dave M.

Make proper pad foundations for support jacks first spacing maybe 5ft
apart or less if its more than one story or sagging is over 2 inches,
use probably 2 bags of concrete per pad. Screw Jacks can be purchased
for 15- 30$ most anywhere. Slowly increase height maybe 1/16" a day
not 1.5" as someone said, and hydraulics are to expensive. When you
get it to height reinforse the beam if needed . I would not do more
than 1" over maybe 3 weeks or walls will crack more. You may have
plumbing and electric issues if pipes are going to be raised.