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#### Ron S.

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Knowing there’s only one hole in the church roof to use for a vent, and that I have approximately fifty feet of horizontal vent and approximately one hundred feet of vertical vent, how can I satisfy an inspector, while knowing "no more than one third of a minimum sized vent can be installed horizontally?" I'm thinking over size the vent piping, but by what percent? Appreciate any suggestion. thanks!
Ron S.

#### TheEplumber

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13,082 Posts
Knowing there’s only one hole in the church roof to use for a vent, and that I have approximately fifty feet of horizontal vent and approximately one hundred feet of vertical vent, how can I satisfy an inspector, while knowing "no more than one third of a minimum sized vent can be installed horizontally?" I'm thinking over size the vent piping, but by what percent? Appreciate any suggestion. thanks!
Ron S.
From the fixture being served- Upsize the vent one pipe size diameter- UPC

ben's plumbing

#### jagans

· Roofmaster
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3,732 Posts
Why not just put another hole in the roof. It will be more Holy. Its a church after all. :thumbsup:

Javiles

#### Alan

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Why not just put another hole in the roof. It will be more Holy. Its a church after all. :thumbsup:
LOL'ed.

Agree with Eplumber.

Upsizing the vent from the fixture being served eliminates the ruling on length.

That said, you CAN upsize the line at the end of it's maximum distance, but doing so will limit the second run of piping.

For example, if you run 1-1/2" vent to it's max distance, upsize to 2" pipe, you are then limited to the maximum lengths of a 2" vent. If your fixture requires a 1-1/2" vent, and you run 2" from the fixture, there are no max distance limits.

#### Ron S.

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Re; How to vent chruch roof

I should of mentioned there are two bathrooms and a small kichen to be vented (seventeen fixture units). The reason for running one vent though an existing space in the roof is because the church has been declared a historial land mark and there are religious paintings on all the four walls. Thanks to Eplumber and Alan for the help.
Ron S.

#### Alan

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17 fixture units = 2"

2" max distance is 120'

1/3 of that is 40'

You say roughly 50 feet....is it 50 + or 50 - ?

If you can run any portion of that on a 45* angle before going horizontal, that is still considered vertical. Depending on how much room you have, you may still be able to get a 2" pipe to work without upsizing.

#### TheEplumber

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13,082 Posts
17 fixture units = 2"

2" max distance is 120'

1/3 of that is 40'

You say roughly 50 feet....is it 50 + or 50 - ?

If you can run any portion of that on a 45* angle before going horizontal, that is still considered vertical. Depending on how much room you have, you may still be able to get a 2" pipe to work without upsizing.
Don't forget the rule about cross sectional area of the bldg. drain. I'd run it in 3"

#### Alan

· Doing it myself
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Don't forget the rule about cross sectional area of the bldg. drain. I'd run it in 3"
True, but i'm assuming they're tying in to an existing vent. You may be right. :thumbsup:

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