My house is a tri-level. The 3rd level down is 30" below grade and on a concrete slab covered with 1x4 sleepers with solid foam panels between them and then a 1/2" plywood subfloor on top of them installed in the 1970's. The attached snapshot of the construction in progress is from an area down the hall from the bathroom where I want to do the repairs. There's some cracking in the sheet vinyl floor in the bathroom, but I can't tell if it's from a leak or just a breakdown of the vinyl. When I remove the vinyl to replace it, what should I replace the plywood and maybe the sleepers with if there is rot? I want to have the result the same height as the existing floor to prevent creating an uneven floor at the doorway. I don't know how the sleepers were installed either (masonry nails or adhesive). The products I've seen aren't thick enough and/or create a lot of seams that might be noticeable when the new vinyl flooring is installed even with leveler of some kind. I'll also need to remove and reinstall the toilet. I anticipate using loose laid sheet vinyl and don't know if it should be installed before the toilet or undercut around it and then caulked. Another bathroom can be used during the repair. The bathroom is 7' x 7' at the longest measurements and there is a shower stall and jog near the doorway and toilet to deal with. Any suggestions on how to approach this would be appreciated.

New house I moved in to has a house jack 10 inches away from block wall... it is in the basement floor concrete as well. is there a good reason why this needs to be there? the span to the next beam is 10ft from the block wall to the main beam with the usual supports. [url]https://postimg.org/image/yu0xdubv9/[/url]