We are renovating our 1930's bathroom. We have gutted the bathroom down to the studs and are expanding the bathroom into the small adjoining room to enlarge it. My husband is replacing the old galvanized plumbing with PVC. So far so good. My first question to pose here is, the floor of the bathroom is the original wood floor to had a layer of vinyl on it. We are going to put either durock or backerboard on top of the wood so I can tile the floor with 1/4" tile. That would add from 1/2" to 3/4", depending on the durock or backboard used. Is there some sort of extension that will raise that big toilet drain up to the tile level? Sorry, not sure what you call the drain, sewer pipe, what ever it's called. We don't wish to replace or change that big pipe. Thanks!