I would bet those concrete piers that heaved are only 12" under ground or so. You are in Maine and frost goes deep.
To fix properly you need to install proper piers.
You need a bottle jack a 6 ton will do you can purchase at kmart or walmart for cheap like $15
Next buy a 6 x 6 pt at a lumber yard and a 4 x 4 pt
With the 4 x 4 jack up one corner at a time just enough to get the weight off like a 1/4" thats it.
Next use the 6 x 6 on a piece of 2 x 12 like 2' long to temp support the building
Get that old concrete pier out and dig a proper pier 42" deep set 12" sono tube and pour concrete only about 12" above grade
Finally get 6 x 6 post bracket and attach to concrete and then install perminate 6 x 6 at proper height.
PS if you hit water at the bottom on your hole put 1 1/4" stone on bottom just above water (do not use gravel) you can get this stone at a landscape supply
Last edited by BrianKiernan; 08-10-2010 at 07:14 PM.