



Here in our first pic, a section of a straight-wall liner has been removed, exposing a black onyx (retro 50’s) cast iron tub. (The clear caulk pads on top of the apron are intended to provide some rigidity between the tub and liner.) With the tub visible, we now know that the tub apron is recessed back from the liner and that we will need to use our larger grinder to reach that section.
Pic 2 shows the cast iron section cut and removed. As you can see, the tub apron is about 1- 1½” behind the front of the liner. Wooden blocking is placed between the liner and tub to prevent the liner from potentially flexing and breaking the seal that will hold the insert to the liner. The long 2x4 extending across the inside cavity prevents the insert from flexing if stepped on.








Pic 3. With the conversion finished and retrofitted with extra-deep insert, the step over into the tub is only 5”.