How Much Should Septic Vent Pipe Extend Above Roof

Upc i 906 1 and 906 2.

How much should septic vent pipe extend above roof.

Extensions of vent pipes through a roof shall be terminated at least 12 inches above such roof unless a roof is to be used for any purpose other than weather protection. This in turn causes the septic system to back up right to the toilets not a pleasant situation to fix. Vent pipes should extend to outdoors above the building roof and should terminate vertically not less than 6 above the roof surface nor more than 24 and must be at least 12 from any vertical surface such as a nearby sidewall. This accounts for the 4 inch tapered head of the flashing and the minimum 12 inches of vent.

This basic release system is essential as a blockage stops the tank from working. The soil pipe also known as the vent stack or stack pipe provides air for the plumbing system. Due to the low pressure in the pipe itself the sewage odors and gases easily find their way out and away from your home. That vent pipe actually pulls septic system odors up through to above the roof line of the home.

Depending on your region the vent stack may protrude only a few inches above the surface of the roof. This may seem suitable since the only purpose for the stack is to provide air and expel sewer gases. The sketch shown here may help explain why the vent pipe should extend well above the roof line. If a roof is to be used for any purpose other than weather protection the vent shall be extended at least seven 7 feet above the roof.

The vent pipe of the plumbing system must extend well above the roof line according to most plumbing codes. Many people think the vent pipe on their roof is to vent the bathroom steam or something of that type. Above the roof plumbing vent height. Measure from the upper end of the connector to the underside of the roof flashing and add 16 inches.