How High Does A Roof Vent Pipe Need To Be

I d maybe try to tie that existing 2 vent into your new 3.

How high does a roof vent pipe need to be. Yes full sized vent pipes are a good idea. At least one of the primary 3 or 4 inch drainage stacks should continue up and through the roof without changing the pipe size. Where a roof is to be used for any purpose other than weather protection the vent extensions shall be run at least seven feet above the roof. 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.

This may seem suitable since the only purpose for the stack is to provide air and expel sewer gases. The soil pipe also known as the vent stack or stack pipe provides air for the plumbing system. I didn t build this house and the plumber just has a 3 inch vent pipe extending through the roof. 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.

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 calculation from example 1 alone would give you a solid working height but if you are close to your peak then you might have more pipe height than you actually need. The horizontal portion of a revent pipe must be at least 6 inches above the fixture s flood level the highest point to which water can rise. It should have been 4 inches.

Vents are required to be at least half the diameter of the drainpipe that they serve so a 3 in. Do i need a full sized vent pipe. 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. In other words the highest point within a 10 foot circle of the pipe.

On a sink the flood level is the sink rim or overflow hole. Depending on your region the vent stack may protrude only a few inches above the surface of the roof. Above the roof plumbing vent height. If your calculated required height falls below 36 inches 3 feet then as per our rule it must be a minimum of 3 feet on the high side of the pipe penetration.

You can connect the kitchen vent to the main vent in the attic as long as the main vent is the proper size and extends through the roof.