A wooden floor made of 40x180 planks laid on beams. The planks have poor geometry, which causes the floor to have large height differences between adjacent planks, irregularities and is generally crooked.
I want to level the whole thing with plywood (already bought – 10 mm) and am considering the following option: screw into the boards with a pitch of 20 cm, so that the heads protrude at the same height, and the heads to lay plywood. Fill the gap between the plywood and boards with a mixture of sawdust and PVA glue or mounting foam. It would be interesting to hear opinions about the practicality of this option.