1/2 inch or 3/4 inch pipe?

Old 07-20-01, 09:27 PM
Moonpie's Avatar
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1950s house w/original 1/2" galvanized pipe. We are 'redoing' a number of rooms and I am going to repipe with plastic (both supply and drain) as much as possible, but I am going to do it one room and section at a time.

I am about to 'redo' my first bathroom. What size PVC & CPVC should I use for the shower, the sink and the toilet? Also, what size for drainage of fixtures?

When we first bought the house and moved in last year, I moved the water heater out of the house into the utility room so it would be on concrete rather than wood floor. I tied into existing galvanized and used 3/4" PVC to the heater and 3/4" CPVC from the heater at the recommendation of a licensed carpenter and general 'handyman' I know. I didn't know if he recommended that size for just piping the water heater or for anything I replaced.

Thank you in advance!
Old 07-21-01, 04:10 AM
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3/4" obviously will carry more volume, but the pressure should be about the same.
Use CPVC only for hot water lines. PVC is o.k. for cold water and drains.
Check with your Building Inspector for local permit and plumbing code.
Good Luck!

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