vent terms

Dostoy320 · Nov 19, 2009

From the Minnesota Plumbing Code:

"Horizontal vent pipes forming branch vents, relief vents, or loop vents shall be at least six inches above the flood-level rim of the highest fixture served."

Can I take this to mean that if I have only a lavatory on a vent pipe - the vent rises vertically from the lav drain the turns 90 degrees and runs horizontally only about an inch above the lavatory flood level to a vertical vent pipe, that this is OK because it's not a branch/relief/loop vent?

Thanks!

Helpful Plumbing Hints for Residential Construction by Bert Polk Plumbing Inspector Lincoln County

FloridaOrange · Nov 19, 2009

6" above the lavatory flood rim, not 6" above the tee. The horizontal vent isn't quite horizontal, you maintain a slight pitch back towards the fixture.

Sponsor · 2022-01-29T12:20:58-0800

Jimbo · Nov 19, 2009

That would be a branch vent, and by code cannot be horizontal until 6" above the lav flood rim. Will it ever cause you problems? NO.

Dostoy320 · Nov 19, 2009

Thanks guys.

What are the chances that an inspector is gonna pass it based on the fact that it's a pvc replacement of the original metal vent pipe in the same location?

I'm really uncertain when doing this remodeling stuff - once I start replacing things, do I have to bring them up to code or can I be grandfathered in or what?

FloridaOrange · Nov 19, 2009

Dostoy320 said:
Thanks guys.

What are the chances that an inspector is gonna pass it based on the fact that it's a pvc replacement of the original metal vent pipe in the same location?

I'm really uncertain when doing this remodeling stuff - once I start replacing things, do I have to bring them up to code or can I be grandfathered in or what?

As long as you used an appropriate transition from the cast or galvanized to the PVC you won't have a problem.
That's assuming PVC is acceptable in your area (as it is 99% of the time).

Dostoy320 · Nov 19, 2009

Are you saying it's OK not to move the horizontal vent up to 6" above the sink flood level because it wasn't originally, or that in general it's OK to replace steel with pvc?

Because I hope you're saying the former... ;-)

Geniescience · Nov 19, 2009

Dostoy320 said:
From the Minnesota Plumbing Code:

"Horizontal vent pipes ... shall be at least six inches above the flood-level rim of the highest fixture served."

Can I take this to mean that .... runs horizontally only about an inch above the lavatory flood level to a vertical vent pipe, that this is OK...?

Thanks!

NO. One inch. No.

Six inches.

Do you have a pipe running horizontally one inch above the sink rim, today?

Dostoy320 · Nov 19, 2009

Yes. The house's original configuration was a wall mount sink with a vent pipe running horizontally about an inch above. I didn't pay attention to it when I was gutting the bathroom. I replaced the steel vent pipe with pvc, following the original run.

The new sink was delivered last night and I held it up to the wall and thought, "whoa, why is that horizontal vent pipe so close to the top of the sink".

hj · Nov 19, 2009

vent

When it says "six inches", what makes you think one inch is okay? You CHANGED it so it is no longer covered by any grandfather clause.

Dostoy320 · Nov 21, 2009

Yeah you're right. I was being lazy. I tore it out yesterday and moved it six inches higher.

vent terms

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