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Thread: Connecting New PVC Pipe Vent to Existing Cast Iron Vent Pipe in a Wall for Toilet

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  1. #1
    DIY Senior Member DanMcD's Avatar
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    Default Connecting New PVC Pipe Vent to Existing Cast Iron Vent Pipe in a Wall for Toilet

    My Plumber made the connection of a new PVC pipe vent to my existing cast iron vent pipe which is in the wall for Toilet. The connection is about 8 inches above the floor. This connection is higher than the toilet or sink drain pipes, because they are all below the floor in the crawl space.

    However, the connection is lower than the top of the toilet bowl and lower that the top of the bathroom sink bowl. The connection is made with a mission band.

    If there ever was a sewer backup, I want to avoid any water that might enter the vent stack past the connection of the two pipes.

    Is my plumber’s connection the correct way?

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    Plumber jimbo's Avatar
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    It can't be a horizontal connection. It could be done with a 45 degree wye, and the vent continuing up at 45

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    DIY Senior Member DanMcD's Avatar
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    It is a vertical vent connection from the crawl space up the bathroom wall to the roof.

    Attached is a picture of the toilet and vent connections under my crawl space.
    Name:  Toilet (left)  & Vent (right) Connections.jpg
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    DIY Senior Member DanMcD's Avatar
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    When one looks at the picture of my pipes in the crawl space, the PVC vent pipe is on the right. The picture shows it going straight up. At the top of the picture would be the bottom of my bathroom floor next to the wall. From the bottom of the floor in the bathroom, the PVC pipe goes straight up (vertical) until it is connected by a mission coupling to the cast iron pipe which then also goes vertical to the roof. The mission coupling connection is about 11 inches from the bathroom floor in the house, which is lower than the top of the toilet bowl. Both the PVC vent pipe and the cast iron vent pipe the PVC is connected is in the wall behind the bathroom toilet.

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    Forum Admin, Expert Plumber Terry's Avatar
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    If it's a mission with a metal wrap on it, you're good to go.

    Those mission couplings are designed to hold at least 10 feet of head.
    Last edited by Terry; 10-13-2012 at 10:44 AM.

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    DIY Senior Member DanMcD's Avatar
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    Thanks. I checked and it is a mission with a full metal wrap.

    Bye the way, was I right that, if the sewer did backed up, could water in the vent pipe reach the level of this couling since it it is about 7 inches lower than the top of the toilet bowl?
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    Last edited by Terry; 10-15-2012 at 10:44 AM.

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