Choosing the right pipe size for Dornbracht shower fixtures.
We have started a fantastic shower renovation here in Yaletwon, Vancouver. The shower will be trimmed out with some great lights and an amazing Dornbracht package.
We shut the water off to the condo yesterday and removed as much of the condo's old Poly B as we could and installed some new 3/4" supply lines for the shower - both hot and cold.
My client is concerned that the 3/4" pex pipe will not produce the same volume as say 3/4" copper. The condo has it's own isolation valves so switching at this point is not the end of the world but I have never seen a shower valve roughed in with 1" pex before - that said I have never installed so many German fixtures in one shower before.
Is there a huge difference in flow rate? I'm sure the valves on the Dornbracht fixtures can not handle this much water as not many homes have this same set up as a condo. I have email Dornbracht and look into this further before proceeding with any more work.
A sneak peak at our project...
Measuring water volume through flow testing
6 gallon per minute GPM [US, liquid] or 22.712 470 704 liter per minute
8 gallon per minute GPM [US, liquid] or 30.283 294 272 liter per minute
A personal volume test in my home here in North Vancouver with a 3/4" water line at 104 PSI passing through 10' of 3/4" pex pipe with 2 couplings and 2 1/4 turn 3/4" shut off's produced 1.15 litres per second or
18.24 gallon per minute GPM [US, liquid] or 69.045 910 94 liter per minute
I'm waiting on feed back from Dornbracht.
Who out there has set up a similar test or measured results from their personal project?
Any insight or suggestions are welcome.
2009 Universal Building Code - Drain pipe sizes required for different flow rates
Shower (based on the total flow rate through showerheads and body sprays)
5.7 gpm or less 1 1/2" P-Trap
Greater than 5.7 gpm to 12.3 gpm 2" P-Trap
Greater than 12.3 gpm to 25.8 gpm 3" P-Trap
Greater than 25.8 gpm to 55.6 gpm 4" P-Trap
This should help you select the proper drain for your next shower package. I have noticed slower drainage rates for the tile insert point drains and linear drains so if your close to one of these limits it would be wise to select a drain with a grill or the next largest P-Trap size.