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November 5, 2009
Pipe Sizing
I need to replaced galvanized water supply lines in my 5 story building.
Should I go with 1" or 1 1/4". I currently have 3/4" on the cold side and 1" on the hot.
Comments
Use copper.
Posted by: edkopel at November 5, 2009 4:31 PM
Ed is correct, definitely use copper!! As far as sizing goes, a lot depends on how many fixtures the risers are supplying and what kind of flow rate they require. When we do renovations on 4 and 5 story Brownstones, we typically use at least 1" H & C. We will sometimes reduce the size after the first couple of floors depending on how many fixtures are on the upper floors and depending on the other criteria I mentioned above.
Posted by: Brooklyn Plumber at November 5, 2009 5:00 PM
FYI:
Oversizing your hot water pipes could mean having to wait longer for hot water if you're not creating a recirculation line.
Posted by: Master Plvmber at November 5, 2009 5:03 PM
Ed, I'm definitely doing copper.
Brooklyn Plumber, according to the WFSU tables, I have 50 WFSUs in the entire building. I have 2 risers. One services 3 bathrooms @ 16.5 wfsu. Another riser services 4 kitchens(1 with dishwasher) and a half bath.. 11 wfsu.
Should i size to the entire building(1 1/4") or to the risers themselves(1").
Posted by: la di da di at November 5, 2009 5:23 PM
a five story building should have a hot water recirculation line built into a replumbing job
Posted by: eman1234 at November 5, 2009 9:46 PM
If you can't install a hot water recirculating line from the Top Floor down to the equipment, they make special equipment that can go under a sink with a circulator on the hot water source which can work in the same manner. eman & MP are right, put something in no matter what size risers!! Actually, code states that a building 4 stories or more in height or buildings with the developed lenght of hot water piping from the source to the farthest fixture needs to have a recirculating line. As far as the info. you gave me, an engineer would be better suited to calculate properly the size of the piping.
Posted by: Brooklyn Plumber at November 6, 2009 3:31 PM
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