Cowboy Builder and Uneven Floor to Solve

[DIYWell]

So, this is what's happened ...

We had an extension built and when I started painting a room I noticed the floor was mainly flat then slopped away. It's a suspended timber floor on the ground floor with 18mm floor panels on it. I got the builder back who tried to convince me the joists has settled. B******s to that. He turned up a few days later with a flooring bloke who looked it over and said he'd put a self leveling compound down. And a week later he did. Fibre based screen all over the 3.4m x 3.6m area. Job done I thought. Next I noticed that the slope hadn't been cured. There was still about a 7mm drop over about 1m. He came back, screwed some 4mm ply down and put a different type of screen down to feather the edges. There's still a noticeable slope but I've had it with the f/wit of a builder.

Now we'll be laying 18mm solid timber flooring down, and there's about 21mm max to play with. The doors can't be trimmed and covering the entire area with ply isn't an option. The room needs to be finished by Christmas.

So, what do I need to do to the floor to make it ready for timber being laid? What I'd like to hear is "mix up some f-ball 700 flex and let it do it's thing" but I suspect someone knowledgeable is going to say something else.

 

[bryanpar]

i think your best bet is to cut a hole in the floor so you can access the joists its sitting on and pack the joists up to bring your floor level.then batton out hole to put back in the piece of floor you cut out this would sort it out

 

[DIYWell]

In the ideal world that would be an option though 'd be more inclined to rip up all the floor panels then all the joists could be packed and trimmed to bring the floor up to standard. But now, absolutely no chance of that happening since it would mean disturbing two rooms and causing more distuption.