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Urbana Roofers: Article About Stack Pipes On A Roof

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A stack vent pipe on any roof is usually the largest pipe to penetrate through the top of a roof. The stack vent pipe is very important since it carries all of the building's solid waste to the sanitary sewer, and it connects the building's plumbing system with atmospheric pressure. Above the roof, it vents the gases coming from the sewer and prevents odors.

If the stack pipe is not installed correctly, multiple issues that affect both the roof and the plumbing system can occur. Stack vent pipes should stick above the roof at least one foot from where they penetrate the roof. If a stack pipe does not extend high enough into the air, then rainwater can drain into the pipe from the roof and into the structure. Also, objects on the roof can fall into the pipe and block it. Urbana roofers understand the many roofing issues related to these pipes.

Stack pipes should be at least 10 feet away from doors, windows or other openings to keep the smell of sewer gases at bay. If a stack pipe is less than 10 feet from any opening, then it should extend at least two feet into the air. If a stack pipe penetrates a sunroof or any other type of roof that has an additional purpose, then it should extend at least seven feet into the air.

The roofers of Roofs By Rodger of Urbana IL can assist you with any questions regarding siding or windows.

It is very important to seal and waterproof the area where the stack pipe penetrates the roof. If this is done incorrectly, rainwater will leak into the roof of the attic. Roof flanges and roof collars can be used to fit over and around the pipe to keep water out.

In cold areas, the vent pipe can close because of frost. Because the air leaving a vent pipe is already moist and near the moisture saturation point, it can quickly freeze when it exits the top of the pipe. One way to prevent this is to simply use a large vent pipe at least two inches wide. Another way is to install a jacket or flange around the top of the vent pipe that has one inch of open air space around the pipe.

Roofing cement around a vent pipe is not enough to waterproof the area. Because the area will expand and contract with hot and cold cycles, roofing cement will eventually crack. Also, the movement of a building settling can cause roofing cement to crack over time.

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