I have some cracks in one room of my house. I think the foundation has sunk in that area. I have heard of mudjacking or slabjacking a foundation. I have no idea how much this costs, and can't find anything. Anyone know these coast, even an estimate? Like 10K? OR less? My best guess is that 500 sq ft needs leveling.
mudjacking is a general term for injecting material into the soil beneath a foundation. By adding material, you increase the volume of the soil and cause it to rise up. The type of material added depends on the soil type (sand vs clay). It can be quite effective and has a low footprint of disturbance. It is a simple process in concept. The contractor drives pipes (vary from 1/2 inch to 2 inches in diam) up to 20 feet into the ground. a hose is connected to the end of the pipe an a large pump pumps material into the ground. there is alot of knowledge skill on where the pipes are placed and at what depth the material is added to the ground. MOB and DeMOB can be a large cost for small jobs (the same equip is need for 200 square feet or 2000 square feet). 10K to 20K is in the ball park of this type of job
You should first find the cause of the sinking foundation to make sure that the mudjacking will fix the problem. In my experience with sinking slabs one cause was due to a drain pipe breaking and washing away the soil below causing the slab to sink. The pipe was repaired and then the slab mudjacked to bring it back to grade. This was on a freeway in California. The second case was due to poor compaction of the soil . In this case the footing was removed and piers placed to bedrock, which was about 4' down and then grade beams placed for footings. You probably need to have this investigated before spending any money.