Tile Shower: What is the point of framing a box around a sub-slab shower p-trap?
Hi. I am in zone 4a.
I just plumbed sewage pipes for my shop bathroom. Having never done sub slab plumbing before, I do not understand the point of the 12×12 box I see framed around the shower p-traps. All I can assume is they are for fiberglass shower units that need perfect alignment. Since I will have to fill in any 12×12 hole in the slab anyways to build up a sloped shower floor, I do not see why I need this box?
Thank you for any light you can shed on this.
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