I recently started renovating my (older) house second floor. Took out the floors that were very squeaky and uneven. The subfloor is a concrete slab that had wood boards glued to it with bitumen. Most were warped, some were rotted so everything was taken out. No structural problems with the slab, but it was poured haphazardly so it is somewhat uneven. The new plan is moisture barrier followed by sleepers fastened to the slab then some sort of OSB with the final flooring on top. Since the room ...
