shower valves

sorry if this is sent for second time.
im building a new house which will have a 5x4 shower with 2 shower heads
my question is would 1 valve be adequate to handle both heads or should i
go with 1 each from a water pressure standpoint
thank you !!!!
richard

Many modern tub/shower valves have a restrictor in the outlet to the shower.
This is tp prevent shower dribble in the tub mode. If it is a shower only valve, it may not have the restrictor, or you could remove it. With the restrictor removed, I believe most brands are rated at something in excess of 5 GPM, so 2 shower heads would work. You need to consider a looping pipe arrangement to balance the flow to the 2 heads.

valve

The "tub" port on the bottom of the valve has a much larger opening to it, so you might consider plugging the top "shower" port and run the bottom ones to the heads. Some valves can be inverted after reversing the interior cartridge so that the "tub" port is on top.