We just purchased a self leveling line laser and were shocked to see how sloped our living room floor is. This will impose a great problem because we plan to put down laminate flooring in the living room, the wood room, and the kitchen (see the diagram below). The laminate floor installation instruction has this requirement on levelness: "Make sure the subfloor is flat. Any unevenness greater than 2mm (1/16") over the length of 1 meter (40") must be smoothed out.". Ours is 10/16" over 40"! Argh!

The rest of the house is not too bad though. I don't know what happened to the living room. Maybe it was built (as an addition to the old cabin) crooked. But if we could avoid it, we will not mess with the foundation. Now, how do we address this sloping floor in the living room (3" over 186" span) just for proper installations of flooring and cabinets?

In my very naive view, we lay plywood sheets across the room, with a gradual reduction in the number of layers from left side to the right. Use leveling compound to even out the step downs. This way, we achieve a level floor in the living room. We will make a 3" step down from the living room into the wood room and the kitchen (along the dotted blue line). What would you do?