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Old 09-17-2016, 11:29 PM   #1
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Sewer Vent Placement Soffit Concerns


I am remodeling my home and just realized I might have put the plumbing vent in the wrong place. The roofers will be here first thing in the morning (7:00am EST) to installed the roof and I want to make sure the plumbing vent is in the right place. It is a 4 inch vent that will be used for the main stack and several other fixtures. I am concerned because it is somewhat underneath a vented soffit. It is 12 inches from the dormer wall. I put a red dot where I drilled the hole. I can move it up above the soffit/dormer roof, but I want to make sure that will work before I do so. Any suggestions?

Thank you.


904.5 Location of vent terminal.

An open vent terminal from a drainage system shall not be located directly beneath any door, openable window, or other air intake opening of the building or of an adjacent building, and any such vent terminal shall not be within 10 feet (3048 mm) horizontally of such an opening unless it is at least 2 feet (610 mm) above the top of such opening.

this section will also apply but the AHJ is required to fill in the mesurement based on local conditions. This is from the 2006 IPC.

SECTION 904 VENT TERMINALS

904.1 Roof extension.

All open vent pipes that extend through a roof shall be terminated at least [NUMBER] inches (mm) above the roof, except that where a roof is to be used for any purpose other than weather protection, the vent extensions shall be run at least 7 feet (2134 mm) above the roof.

This section also comments on the location under soffits.

904.6 Extension through the wall.

Vent terminals extending through the wall shall terminate a minimum of 10 feet (3048 mm) from the lot line and 10 feet (3048 mm) above average ground level. Vent terminals shall not terminate under the overhang of a structure with soffit vents. Side wall vent terminals shall be protected to prevent birds or rodents from entering or blocking the vent opening.
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Last edited by ksears91; 09-17-2016 at 11:31 PM. Reason: Typo
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Old 09-18-2016, 09:00 AM   #2
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Re: Sewer Vent Placement Soffit Concerns


If your putting windows on all the dormers make sure you are 10 foot away and not under neath the vented soffit. Have you been inspected yet?

Could you possibly run your vent out through the roof of a dormer.
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Old 09-18-2016, 09:44 AM   #3
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Re: Sewer Vent Placement Soffit Concerns


I have not been inspected yet for plumbing. I think I am going to put it up above the dormer room. The roofers said they will come back to install the vents once I figure out where they need to go.
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Old 09-18-2016, 12:28 PM   #4
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Re: Sewer Vent Placement Soffit Concerns


Why not just put a 90 in the event and come up mid way between the dormers.
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