Michael Byrne was a tile contractor for more than 25 years and has been a long-time contributor to JLC.
Why it's important to know the difference when installing tile over a plywood subfloor.
To avoid flexing that will crack the tile, bridge the joint between the old and new sections with thick plywood underlayment.
Be sure to use resin and cloth designed for nautical use, which will be less likely to crack from the normal structural movement of a house.
Whether the process is complicated or relatively easy depends on the type of drain and its location.