[gregpark]

See that little nail holding the heater duct to the side of the floor? Pry it out to expose the layers of flooring. There's probably barrier paper on top of the subfloor you can see from below. Pop the ceramic tiles up and remove, take a thickness measurement of the remaining layers to the top of the subfloor and set the depth of your worm drive skill saw. Grid the floor into 2' squares with a carbide blade and pry up the squares with crow bars. (A Sawzall will finish your cuts against the walls.) I'm a flooring guy and this is how we do it. Time is money to me and this is the cleanest fastest way.(Gloves, hearing protection and safety glasses are in order)