Hi Victoria, There is another variation of PEX to consider, PEX-AL-PEX. One form of this allows for tubing to be expanded to the point where the fitting connection does not restrict flow (full bore). This provides both the flexibility as well as rigidity ...
I appreciate the PEX industry's perspective here, but I am not a fan of the "spaghetti" piping as a design. Using the branch manifolds and running 30 pipes directly from the main shutoff point to 14 different fixtures sounds like a good idea to avoid ...
Victoria is correct that the appropriate hydraulic sizing tables should be used and that copper sizing should not be applied directly to PEX. While PEX is manufactured to a CTS (Copper Tube Size) outside diameter, most potable water PEX is SDR-9 (Standard ...