First, thanks for a great site. I have been doing lots of reading these past few months and decided to tackle adding a main floor bathroom (sink, toilet and shower). I have almost completed all the D/W/V portion and will be starting the supply lines but I am a bit confused regarding sizing.
This bathroom is directly below an existing upstairs bath and was wondering if I could tee off the 1/2" lines that supply the upstairs bath or do I need to run separate lines? The existing cold line tees off a 3/4" supply and the hot tees off a 1/2" line that is 6 feet from the water heater. Let me know if there is any other information that I need to provide.