Second floor master bath toilette, two sinks and shower are currently fed from 3/4 inch copper run from basement. As part of second floor guest bath remodel, I will be able to run pex to entire guest bath and master bath sinks and toilette leaving the master shower the only thing left on the 3/4 inch copper. I would need to demo the master bath also to get pex run to the shower and I don't want to do that right now.
So my plan is to replace all water pipe in the house with 1/2 inch pex on home run manifold with the exception of the master bath shower that will be on the 3/4 inch copper. So I would like to run 1/2 pex to the 3/4 inch copper for hat shower until such a time that I demo the master bath.
So would it work to run 1/2 inch pex to 3/4 inch copper in the basement feeding only the shower?