Originally Posted by adpanko
You should have enough depth behind the valve body to put in 1.5" thick blocking behind it. Instructions say the center line of the valve should be 2.125"-3" from the finished wall surface. You're finished wall surface will be greater than 1/2" (1/2" drywall or backer board, plus whatever tile or shower wall surface you put on top of that). So subtracting at least 1/2" from the finished wall surface, and you'll get a valve center line that is at most 1.675-2.5" into the 3.5" deep wall cavity (assuming you use 2x4s). That leaves you more than 2" of space behind the valve center line. I assume from the valve center line to the back of the valve body is probably about 3/4" (judging from the diagram). So it appears like you should be able to get 1.5" deep blocking back there. If not that thick, you should DEFINITELY be able to get 3/4" thick blocking behind it.
WOW Thank you
I'm building the wall tomorrow,thanks for the info and detail
Do you think it's better to have a bigger backing plate then that 3/4" for Valve body.
2x4's where planned all along,but that valve body is hugh and thought the 2x6's where a better choice.
But you know a lot about this...
again thank you for the all info