How Do I Check My Subfloor Level

Lay a 4- to 6-foot beam level on your floor. … Measure any gap that appears between the floor and the level. … Mark any areas of the floor that are higher than 1/8 inch along the floor. … Slowly slide the level over the floor to check each area of the subfloor.

Does subfloor need to be perfectly level?

The only leveling you need to do is to smooth out the surface to get rid of any bumps or dents. This is the foundation on which you surface (finished) surface rests. It gives sturdiness and balance and is attached to the floor joists. In a kitchen, appliances are usually attached to this surface.

How level should a subfloor be?

Get down on your knees and look for daylight under the level or board. Mark the high and low spots on the subfloor. Plan to correct gaps of more than 1/8 to 3/16 inch.