Hi Guys, Im looking at ways to level the old wooden floor in our PPOR. There's currently about a 30 - 40mm mm difference across the house with some noticeable highpoints in the living areas. I've spoken to a few tilers who are quoting to put screed down across the whole house, but they keep saying its a big job, so I'm expecting high quotes. One tiler suggested getting a builder to lay level joists on top of the existing floor and then put floorboards down on top. Has anyone ever done this? Its an area of about 85m2. Jacking up the house isn't really an option because it has so many additions that its not just one corner that would need to be lifted. Any advice would be greatly appreciated.