Raising old floor 10 cm (about 4 inches), Am I thinking right? So I bought an old house out here in Japan where I have lived for some time. It’s around 75 years old but was built to replace an older house that burnt down so it has the old style of building. One room that was renovated some time later has a floor that is falling apart. The joist seems fine (from above but will check closer later) but the flooring is peeling and weak. I read that this is normal with this kinds of wood from that era and if there is any moisture at all. I will be tearing it out this weekend. I want to raise the floor 10cm (4inches) to match the large portion of the house to make it wheelchair accessible. While I will be doing this in other rooms too, this room is the biggest has has the most extreme raise and is the only room that has bad floors. My plan is as follows, is this bad? after tearing out the floor I will fix any joists that are in bad condition and possible add some floor supports as needed.…