How High Should A Vent Pipe Be Above The Roofline

You must also consider the snow line so the pipe does not get covered.

How high should a vent pipe be above the roofline.

Do you get snow and or snow drifts in your area this may change my answer. In other words the highest point within a 10 foot circle of the pipe. If the roof area is for people then it is 7 ft above the roofing surface. Recommended minimums make sure the stack to protrude a minimum of 15 cm 6 inches from the roof.

If the pipe is farther than 10 feet from the roof peak it must be 2 feet above the highest point of the roof within 10 feet. Please note that this rule doesn t generally apply to pellet and gas vent systems. The vent is supposed to be 10 away or 2 above any window. I am sure the plumber put it at that height for the inspector.

This accounts for the 4 inch tapered head of the flashing and the minimum 12 inches of vent. Open vent pipes that extend through a roof shall be terminated at least 6 inches 152 mm above the roof or 6 inches 152 mm above the anticipated snow accumulation whichever is greater except that where a roof is to be used for any purpose other than weather protection the vent extension shall be run at least 7 feet 2134 mm above the roof. 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. Some builders recommend a minimum of 30 cm 12 inches.

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. Plumbing books vary in their advice. You are letting air into the plumbing system of the house. This reduces the actual required height by 12 inches from our previous calculation of 64 inches.

So 28 inches plus 24 inches is a chimney height of only 52 inches. A vent terminal and depending if the roof is strictly for weather protection it terminates about 24 above the roof. Measure from the upper end of the connector to the underside of the roof flashing and add 16 inches. You should be able to cut that vent shorter but stay above the roof line.

Per the 10 and 2 rule once you are at the level of the peak you only need to be 2 feet above it.