Q: Should we use felt paper over the plywood, thin set, or both?

We live in an "A" frame house. We are trying to redo our bathroom (5X9) completely. Our bathtub/shower is against one of the exterior walls and goes under the subfloor of the house. After removing the old steel tub and replacing it with a fiberglass tub of what we thought was the same size we found that our level frame (built of a base under the house and included the exterior wall studs) was not level enough or a tight enough fit for the new tub so we had to add additional framing that protruded from the wall studs. We placed a plastic vapor barrier over the installation and the studs and are currently putting up plywood to even the wall with the new frame before we put up the cement backer board so that we can tile.

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