Master Shower - Body Sprays
I'm helping a friend design her master bath renovation, and she's wanting to put in body sprays (2 per side, so 4 total) in addition to a regular shower head. No rain shower or hand-held. The existing shower is 30 years old, and supplied by what we're assuming (no demolition has been done yet) is 1/2" copper pipe.
I'm wondering if the existing supply lines will adequately supply all of these water heads or if she'd need to run a 3/4" line instead. The lady trying to sell her $3,000 worth of plumbing fixtures assures us that "It's done all the time - works fine!" But I've got my doubts...
She said to transition from the existing 1/2" line to a 3/4" line for 5-6 feet before switching back to 1/2" lines right before the fixtures. I'll freely admit that I know very little about plumbing, but this doesn't make any sense to me. I would think you'd need to run 3/4" line all the way from the 3/4" trunks to shortly before each fixture for optimal performance. But that means drilling into concrete slab.
Hopefully someone here will know --