Raise the board until the level reads true then measure from the dip in the floor to the bottom of the board.
How to level single floor board.
Cut first leveling strip.
On the top side of the floor another fix it idea to lay down new hardwood over the existing floor.
If the level isn t long enough lay a flat board along the floor with a level on top.
Floors are rarely perfectly level.
You will have to make sure your joists can handle the addition of considerably more weight from the plywood subfloor and any floor coverings.
If the floor is uneven lift up the board until it is level so you ll know how much flooring compound you ll need to even it out.
A plywood subfloor will bridge any minor waves in the existing floor and leveling compound would help too.
In this video we show you everything you need to know how to level a floor into a perfect flat and level floor in your bathroom using self leveling floor com.
If an engineer found no structural issues you may be able to level the floor by applying a cement based self leveling floor product such as henry level.