Question: What can you do if your floors squeak?
Option 0: Have someone walk all over the floor while you stand in the attick. When you hear a squeak, mark that rafter with chalk. Screw 3-in. L-brackets to the joists so their tops are flush with the tops of the joists. Then drive screws up into both the subfloor and the surface floor, pulling them down tight to the joists.
Option 1: Have someone walk all over the floor while you stand in the basement. When you hear a squeak, mark that joist with chalk. Screw 3-in. L-brackets to the joists so their tops are flush with the tops of the joists. Then drive screws up into both the subfloor and the surface floor, pulling them down tight to the joists.
Answer: 1