Floor tile installer most likely did not level the floor by grinding 1 8 in high areas and filling 1 8 in low areas.
How to level a wooden floor for tile.
Check for dips in the floor by sliding a 4 foot to 6 foot straight edge in different directions all around the room.
Pour a generous amount of mixed leveler onto the subfloor focusing on one or more wavy areas.
Floors are rarely perfectly level.
Allow the primer to dry according to the manufacturer s instructions.
On the top side of the floor another fix it idea to lay down new hardwood over the existing floor.
Spread the leveler over the floor with a trowel or a gauge rake so it covers each low area completely.
Cabinet installer set cabinets on concrete subfloor and shimmed only to level rather than to raise to potential new floor level.
And 3 grind the hump of the plywood.
Then vacuum the floor with a wet dry vac or sweep it with a broom.
Make a final check with the level to be sure all the high and low spots are gone.
You will have to make sure your joists can handle the addition of considerably more weight from the plywood subfloor and any floor coverings.
Which could raise the floor substantially.
2 to pour self leveler on plywood directly and skip hardiback.
Prepare a wood subfloor for tile a successful tile installation project requires a level surface.
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.
If you find hollows and valleys you must fill them with a self leveling underlayment.
A plywood subfloor will bridge any minor waves in the existing floor and leveling compound would help too.
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 pro self leveling underlayment available.
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.
Apply the primer evenly with a roller brush.
He simply filled low areas.
In order to level the subfloor to install tile the builder suggests 1 to put a paper on plywood and pour self leveler and skip hardibacker.