How big is the subfloor in my bathroom?

My house is 1 story, but I have a basement so all the floors on the main level are “upstairs” and have a wooden subfloor. I ripped out the vanity in a bathroom I’m working on and starting taking out the tile. I had a bit of trouble because the vanity had to be lifted almost 2″ to come out which I thought was odd.

What should I use to level my subfloor for tile?

If needed, sand the plywood down to level the subfloor. Plywood must be installed over an adequate subfloor and must be at least 1 1/8″ thick when combined with the subfloor. Interior-grade plywood and particleboard are not considered strong enough for a tile installation.

What happens if I put ceramic tile on my subfloor?

If ceramic or porcelain tiles are installed on an uneven surface, you run the risk of allowing the tiles to crack or loosen. Here are some instructions on how to prepare your subfloor for a tile installation.

What kind of material is under my bathroom tile?

It looks like there is some type of poured in “concrete” like material above the wooden subfloor and the tile. Any idea what this is? Can I just pour in more where the vanity was to level it out?

How big should the subfloor be for a bathroom?

Tile over Wood Subfloor. Plywood and OSB are the two most common materials used for floor decking, and typically they are 5/8″ or 3/4″ thick. In this scenario, Jim and Rich install 1/2″ cementious backer unit (CBU) resulting in at least an 1-1/8″ thick subfloor.

Why do I need to replace the subfloor in my bathroom?

Excess moisture in the subfloor is a common reason for early replacement of bathroom flooring, but it can be prevented by choosing the right material from the beginning. Wait, What is a Subfloor Anyway? A subfloor is the lowest structural layer beneath the finished flooring.