Tub only to Shower Enclosure cement board?
Hallway bathroom has a whirpool tub and I would like to add shower walls to this, and leave the tub. I have seen the sections you can get from home improvement stores, Menard's, like the back section and the two sides.
My question is how can I tell if I have cement backer board installed? Do I have to have it to put the shower walls over? Would this have been done when they put just a tub in the bathroom?