I will try this here, been posting everywhere. My house is 102 yrs old and is settleing. I have a dirt crawl space. We have replaced several of the brick supports with screw type jacks. The main beam is huge and over 150 yr old timber. There has been an addition on the rear of the house and the floor is separating from the original part of the house. I have a 3.5" dip at the center of the 1st floor. The 2nd floor has a pretty bad dip as well. I have been told to fix this is very easy but cannot get any contractor in this area to give me an estimate let alone agree to do the work. There appears to be a mortar/lathboard chimney wall in the center of the house where the stair well is and that is where the dip is the worse. Most of the venting for the furnace/AC unit runs along the support beams under the house and makes it difficult to manuver around to do anything. I would just like to know where I can get some information, with illustrations, on how to do this correctly.