I have a room in my house where the floor is uneven due to an extension. The side by the foundation is solid, but as you move into the room, it dips down over the wood floor joists and plywood subfloor. There's a noticeable dip after the concrete foundation ends. I'm planning to install hardwood flooring in this area, but I'm not sure how to level the floor properly. I'm considering options like self-leveling compound for the 20x12 area, but I'm wondering if there are better methods, such as adding more plywood or moisture barriers. Any advice?
2 Answers
Self-leveling compound can work, but for a large space like yours, adding an extra layer of plywood would definitely provide more stability. Plus, it might be easier to manage than pouring leveling compound over such a big area. Just make sure to use a moisture barrier if needed!
If the dip is mostly uniform, you might just want to throw down another sheet of plywood to even things out. But if it's more complicated, then you might need to mess with the posts or beams to truly level the floor. Definitely do a level check over the whole area!
That’s a good call! I’ll measure the drop and see how consistent it is. I don't think there are any posts under there, which could make things tricky.

Solid advice! I’ll look into both options and see what aligns best with my situation.