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 how many fixtures/toilets/etc. can share a vent?
Author: dadio917 (NV)

eom

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 Re: how many fixtures/toilets/etc. can share a vent?
Author: steve (CA)

It depends on the type of fixture and size of the vent. Some fixtures need a dedicated vent.

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 Re: how many fixtures/toilets/etc. can share a vent?
Author: dadio917 (NV)

which ones require dedicated vent?

on our old house two vents are shared by two toilets, three sinks and two tubs. I want to add a bathroom.
thanks

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 Re: how many fixtures/toilets/etc. can share a vent?
Author: steve (CA)

Under the Uniform Plumbing Code, a 2" vent can handle 24 fixture units(F.U). In a residence, a lavatory sink= 1.0 F.U., bathtub/shower= 2.0 F.U. and a toilet 1.6 gallon or less= 3.0 F.U, greater than 1.6 gallon= 4.0 F.U.
So, 3-lav sinks, 3-1.6 toilets and 3-tubs/showers could be on one 2" vent. The UPC requires a 2" minimum vent for a toilet, other codes allow 1½". What size are the current vents?

A sump pump might be required to have a dedicated vent, run through the roof.

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 Re: how many fixtures/toilets/etc. can share a vent?
Author: e-plumber (NY)

It depends on the size of the existing vent(s) whether or not it will be overloaded by adding new vents to it from a new bathroom.

e-plumber
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"The society which scorns excellence in Plumbing as a humble activity and tolerates shoddiness in philosophy because it is an
exalted activity will have neither good Plumbing nor good philosophy: neither its pipes nor its theories will hold water." -
John William Gardner 10/8/1912 - 2/16/2002

Repair your leaking Plumbing fixtures ASAP [www.theplumber.com]
This slow drip will waste 7+ gallons of water per day.

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 Re: how many fixtures/toilets/etc. can share a vent?
Author: packy (MA)

check your local codes. some places allow AAV's
[images.google.com]

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 Re: how many fixtures/toilets/etc. can share a vent?
Author: e-plumber (NY)

"some places allow AAV's"

...And just when someone comes along inquiring about possibly using real vents, tisk tisk :\

e-plumber
-----------------------------------------------------------------------------------------------------------------------------------

"The society which scorns excellence in Plumbing as a humble activity and tolerates shoddiness in philosophy because it is an
exalted activity will have neither good Plumbing nor good philosophy: neither its pipes nor its theories will hold water." -
John William Gardner 10/8/1912 - 2/16/2002

Repair your leaking Plumbing fixtures ASAP [www.theplumber.com]
This slow drip will waste 7+ gallons of water per day.

Post Reply

 Re: how many fixtures/toilets/etc. can share a vent?
Author: packy (MA)

mea culpa

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 Re: how many fixtures/toilets/etc. can share a vent?
Author: hj (AZ)

The question is ambiguous because the number of fixtures on a vent depends on how they are connected together, not their quantity. Each fixture needs a vent, but the number of them on a single vent is usually limited by their spacing.

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 Re: how many fixtures/toilets/etc. can share a vent?
Author: Patrick (CA)

Hello HJ,

Would you please elaborate what you mean by "the number of them on a single vent is usually limited by their spacing."? Is there any maximum number of feet such that vents can not be joined together as one vent stack, even though a 2" vent pipe supports less than 24 fixture units?

Thanks.

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 Re: how many fixtures/toilets/etc. can share a vent?
Author: dlh (TX)

yes there are distance requirements that have to be met and the distance depends on how many fixture units and how far for what size.

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PLUMBERS "Protecting The Health Of The Nation"

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 Re: how many fixtures/toilets/etc. can share a vent?
Author: packy (MA)

see if you can make any sense out of this...
[www.metrokc.gov]

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 Re: how many fixtures/toilets/etc. can share a vent?
Author: hj (AZ)

No, but there is only so much pipe available to connect the various fixtures so if you try to put too many together you will run out of space to do it. It is a bad question because it can be interpreted many ways and each will have its own correct reply.

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