WiltshirePaul

here's some better images as close ups. This is the worse one

Hello all. first post for me as I've got issues at home and I'm overwhelmed.... Our house is from 1979/80, built into a greensand slope. The double garage sits under the front two bedrooms and bath/cloakroom. Those rooms are held up by three 6m spans of single and doubled up steels sitting in between 9inch cavity walls. We get a lot of water movement through the hill behind the house and although the garage walls get efflorescence it doesn't get wet. But there's corrosion to the ends of the steels that are underground. They were boxed in but I've cut all this off and removed fireboard, insulation and dead rats to mor or less start again. An old boy surveying engineer came round this week and said you need to stop the wet otherwise anything you do to the steels isn't going to work. His suggestion is to cut the steels and build block piers internally (if the concrete slab is thick enough (it isn't). I am getting views/price from the steel cutting firm and I need to do/arrange the slab to be cut and excavated so that 300mm of concrete can be laid as a pad for the blocks. Anyway, I just wanted to ask if there are other options open to me. I can't get to the outside side of the steels as there's a hill etc in the way - but I could cut and dig around the steels inside the garage to see what the damage is - is there any kind of treatment I can do around the steels in the wall itself to stop moisture getting to them? I should add that I intend to abrade the steels and prime/intumescent paint them afterwards as they were boxed in before. Thanks, Paul