Cut first leveling strip.
How to level single floor board.
If the area is very large use a long straight 2 in 4 in 5 1 cm 10 2 cm board and set your level on top of it.
Rather than attempt to lift the floor by packing out between the boards and the joist the packing invariably works loose as the floor moves with use it is easier and more cost effective in the long run to remove the floor boards and level the joists by fixing new straight ones to the existing.
If the level isn t long enough lay a flat board along the floor with a level on top.
A plywood subfloor will bridge any minor waves in the existing floor and leveling compound would help too.
Raise the board until the level reads true then measure from the dip in the floor to the bottom of the board.
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.
On the top side of the floor another fix it idea to lay down new hardwood over the existing floor.
Floors are rarely perfectly level.
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.