After I replaced the moldy wood subfloor in my master bathroom, I checked it with a torpedo level (a torpedo level looks like this,) declared it level, and promptly passed out in bed from exhaustion. (Disclosure: I am including affiliate links for your convenience.) The next day, I double checked the new subfloor with the correct tool for the job, a large I-beam level (an I-beam level looks like this.)
The new wood subfloor is not level.
There are a few random areas where the floor isn’t flat, mainly where some of the seams of plywood sheets meet - a pretty common thing when you are replacing a subfloor (especially if it is the first time you’ve removed and replaced a subfloor.)
You can’t lay tile on an uneven floor. Well, you could, but the grout and tile will eventually crack and break in those areas and you’ll curse the day you were born when you have to rip everything out (probably) and do what you should have done in the first place. Fix the uneven wood subfloor with a self leveling underlayment coating for floors.
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