Use a sander to sand the high spots.
How to float level a floor.
If you expect to create a lot of sawdust wear a dust mask and use painter s tape to tape plastic sheeting over doors and air vents so the dust won t spread.
I will stay within the lines that we drew on the floor in tips 1 and 2.
Remove any baseboards as well because the height of the floor will raise after you level it.
If the uneven floor is due to floor joists that have warped or twisted over time or were incorrectly installed the only way to level the floor is to remove the subflooring and shim the joists.
Measure the drop lay a long level downhill on the floor with one end of the level on the level part of the floor and the other end at the lowest point.
Remove all of the furniture appliances and baseboards from the room.
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Your local home depot store may have rental tools available.
You could mix smaller or larger batches.
Fill cracks in concrete subfloor and make sure the filled areas are level before cleaning the subfloor.
Keep checking the floor with a level as you sand it.
Compound can correct sags and dips as deep as 1 1 2 inches.
Once the thin set is mixed i then use my tile trowel the notched side to spread the thin set over the dip in the floor.
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A thorough cleaning is also necessary to get the subflooring ready to accept the liquid bonding agent.
Use a metal putty knife or scraper to gently pry baseboards off the walls.
I will then pull my trowel across the floor trying to leave nice even tracks.
Fixing a floor that sags and dips pour self leveling underlayment in the problem area.