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.

Make sure the stack to protrude a minimum of 15 cm 6 inches from the roof. The 6 you describe should be just fine. The slope is about 4 high for every 12 horizontal. Some builders recommend a minimum of 30 cm 12 inches.

The top of the chimney should be at least 3 ft 0 92 m above the roof surface. A vent stack is not like a chimney which requires 2 higher than any roof within 10. 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. Plumbing books vary in their advice.

Above the roof plumbing vent height. You are letting air into the plumbing system of the house. In other words the highest point within a 10 foot circle of the pipe. 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.

Upc i 906 1 and 906 2. 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. 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. For gas vents or a type l vent this distance above the roof surface must be at least 2 ft 0 61m.

I have a main vent and a sink vent and both are only 6 high above the roof. If the roof area is for people then it is 7 ft above the roofing surface. Vertical blue line along the left side of the chimney in our photo.