On 2006-10-01, Dan_Musicant wrote:

I'll need a lot more than replacement sill plates. They have to jack up
the house, remove the current foundation, excavate for a new foundation,
place rebar and pour concrete. Then new sill plates, lower house and
bolt to the foundation.

In my case, a single story house with a crawl space, the way my
foundation contractor replaced the foundation didn't involve any
jacking or moving the house. The floor joists were independently
supported on two long beams sitting on cribbing inside and outside the
crawl space. Then the existing foundation was demolished, leaving a
trench for worker access. The sill plate was replaced and nailed into
the cripple studs from below, and the form work and bolts for the new
stem wall were hung from the new sill plate and the existing cripple
wall, respectively. Of course the cavity between the forms was thick
with rebar. The inverted T-shape foundation was done in a single
pour, with the footing portion just poured against the earth the width
of the trench. After the pour, the forms were stripped, the drainage
system was installed on the outside, and the trench was filled.

Cheers, Wayne