Different brands and models of shower valves require different wall-depth installation. You should always follow the installation instructions that came with the valve assembly.
Most valves come with a temporary plastic or cardboard "plate" that illustrates the location of the finished wall surface in relation to the valve-body installation depth. If you do not have that "template" anymore, you can often estimate depth by assembling the trim to the valve and measuring from where the wall surface would be to the mounting holes. You need to locate the supply piping according to final installation depth of the valve, not the other way 'round (not an issue with flexible supply tube like PEX).
Except for special application products, they are made to fit a standard wood-frame wall but may not allow the use of 2 x 4 lumber as a mounting support; in fact, some recommend use of a manufacturer-specific mounting strap/stringer.
Example of depth mounting instructions for a random Delta valve model:
Shower Valve Installation Location
plumbing - Industry standard blocking placement for shower mixer valve? - Home Improvement Stack Exchange
Adding new shower valve. Something I can do myself or need to call a plumber?
Installing a shower valve - DoItYourself.com Community Forums
Videos
Different brands and models of shower valves require different wall-depth installation. You should always follow the installation instructions that came with the valve assembly.
Most valves come with a temporary plastic or cardboard "plate" that illustrates the location of the finished wall surface in relation to the valve-body installation depth. If you do not have that "template" anymore, you can often estimate depth by assembling the trim to the valve and measuring from where the wall surface would be to the mounting holes. You need to locate the supply piping according to final installation depth of the valve, not the other way 'round (not an issue with flexible supply tube like PEX).
Except for special application products, they are made to fit a standard wood-frame wall but may not allow the use of 2 x 4 lumber as a mounting support; in fact, some recommend use of a manufacturer-specific mounting strap/stringer.
Example of depth mounting instructions for a random Delta valve model:
I have installed many. in thick wall install , plaster guard should be and exercise of looking at the trim kit to see how far the handle will protrude from the wall and how much of the center cover is showing. for my Delta installs with 1/2" Travertine i recess 3/8" back . I dont use a full 2x4 stringer. this will accommodate a delta trim later or an after market Danco with a long stem and handle that stick out into shower area. I have recessed deeper so that plaster guard is 1/2" behind flush with tile. years later on that on , i had trouble attaching the handle when changing out trim. I got it on there, it was just a steep angle for the Allan screw.
Bought a new bathtub hardware kit as old one was corroding. I have installed the tub faucet and shower head with no problems. Of course the lever handle in this kit does not work with the old shower valve. It did come with a new valve to install. I thought I could just unscrew the nuts on all 4 sides and remove the old valve, but they won’t budge. Probably answered my own question but should I call a plumber for this or does anyone have any tips on removing?
Couple years ago my shower valve stem snapped off and in a panic I cut it out and Sharkbite capped the supply lines. Now I’m feeling like I can replace the valve. Does anyone have any ideas how to easily install this new moen valve? I’m not a plumber and don’t know how to solder. I feel like Sharkbite might be acceptable because it’s easily accessible. Also how do I pipe in for the tub spout? The new tub spout is a thread on type