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I’m replumbing, and have a couple of questions for those with the knowledge regarding vents and supply pipe sizing.
The bathroom has 1 1/2″ drains on the tub and sink, sharing a 1 1/2″ vent. The vent was originally for the tub, and was extended under the floor to below the lavatory (with proper slope). My question: can I run another branch from the original stack 12′ under the floor to vent a third drain (a washing machine standpipe — 1 1/2″ pipe flowing into 2″ pipe which drains the kitchen sink)? There is enough elevation change for the horizontal leg of this vent extension to have 1/4″/ft slope. Or must I create a new vent for this new drain?
I’m replacing galvanized supply pipe with copper. Should I run 3/4″ hot water to the bathroom and then branch to 1/2″ for the lavatory and shower/tub, or is it sufficient to run 1/2 all the way to feed both the sink and tub?
Same question for the cold water, which will supply the tub/shower, lavatory, and toilet.
thanks.
The supply pipe coming into the house is 3/4″.
Replies
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FXDP,
Yes, you should run 3/4" copper for the cold, as it feeds 3 fixtures. The hot is your call, but the 1/2" line will take half the time to get hot when you first turn it on that the 3/4" does. With modern flow-controlled faucets, the 1/2" is the way to go.
Your venting question needs more data. If the washer is downstairs from the bath, it is fine, but if on the same floor, the vent must begin at least 6" above the top of the standpipe (flood rim if a sink) and rise 1/4" per foot on its way to the vent stack. 1.5" vent is good for 8 fixture units, and your bath plus vanity are 3 units together. I gather the toilet is vented separately on another wall or something.
Bill
*Vent fixture must be within six feet from vent stack.Washing machine must be on 2 inch drain lines. easy way to remember is to drain and vent all fixture on 2 inch line except toliet( 3)
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I'm replumbing, and have a couple of questions for those with the knowledge regarding vents and supply pipe sizing.
The bathroom has 1 1/2" drains on the tub and sink, sharing a 1 1/2" vent. The vent was originally for the tub, and was extended under the floor to below the lavatory (with proper slope). My question: can I run another branch from the original stack 12' under the floor to vent a third drain (a washing machine standpipe -- 1 1/2" pipe flowing into 2" pipe which drains the kitchen sink)? There is enough elevation change for the horizontal leg of this vent extension to have 1/4"/ft slope. Or must I create a new vent for this new drain?
I'm replacing galvanized supply pipe with copper. Should I run 3/4" hot water to the bathroom and then branch to 1/2" for the lavatory and shower/tub, or is it sufficient to run 1/2 all the way to feed both the sink and tub?
Same question for the cold water, which will supply the tub/shower, lavatory, and toilet.
thanks.
The supply pipe coming into the house is 3/4".