Rough plumbing for tub/shower valve??

I am currently in the process/planning a bathroom remodel and for the life of me I can't remember the measurements for the rough plumbing of the tub/shower valve. ie...The riser, bumpers, the "outs" for the on/off, cold/hot knobs, the "down" for the tub spigot...etc... I know some of these measurements vary from valve to valve(moen, kohler,etc..), but is there a general "rule of thumb"? Also, what is the typical measurement for the 2" by 4" "blocking" to support the valve?Please help. Thanks Kindly!!!

a safe bet

why not just install the faucet loose in
the wall and you are sure to win???

you can always put a shim in the wall to make it tighten down
later




usually with a 2x4 the delta seems to work out pretty
well installed to the 2x4