How High Above The Roof Should A Vent Be

This specification makes sure steep roof slopes are cleared.

How high above the roof should a vent be. 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. A vent terminal and depending if the roof is strictly for weather protection it terminates about 24 above the roof. The top of the chimney should be at least 3 ft 0 92 m above the roof surface. Vertical blue line along the left side of the chimney in our photo.

Plumbing books vary in their advice. If there is no vapor barrier double it to one square foot of nfa for every 150 square feet of attic floor space half for intake half for exhaust. In other words the highest point within a 10 foot circle of the pipe. Make sure the stack to protrude a minimum of 15 cm 6 inches from the roof.

If your attic floor has a vapor barrier you will need one square foot of nfa per every 300 square feet of attic floor area half of that will be intake half for exhaust. The 6 you describe should be just fine. A vent stack is not like a chimney which requires 2 higher than any roof within 10. The slope is about 4 high for every 12 horizontal.

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. If the roof area is for people then it is 7 ft above the roofing surface. That means that when there is mechanical equipment on the roof sun decks you name it the plumbing vents need to extend up above the roof 7 feet. Some builders recommend a minimum of 30 cm 12 inches.

Upc i 906 1 and 906 2. Above the roof plumbing vent height. You are letting air into the plumbing system of the house.