However, anything mechanical can and will fail. Check with your local AHJ – Authority Having Jurisdiction for more info.ĪAVs are certified to reliably. Some state and local building departments prohibit AAVs. If we don’t have a hole in the roof, it’s easier to maintain it.ĪAVs have been effectively used in Europe for more than two decades. They also allow greater flexibility in the layout of plumbing fixtures and reduce long-term roof maintenance. That’s money in the pocket of the plumber. We always want to maintain that open vent design in the plumbing system.Īn AAV can significantly reduce the number of venting materials needed in a plumbing system. The liquid will come out but won’t come out as freely as it would if you poke a small hole (a vent) on the other end of the bottle. Think of it as holding a large soda, water, or milk bottle upside down and removing the cap. When it opens, the air can enter the plumbing system allowing the water to pass through the waste pipe. If we didn’t have either venting method, you would have a very noisy sink drain.Ī discharge of wastewater down your sink drain causes a valve on the AAV to open. Think about it – when have you seen a plumbing vent on the front roof line of a home as it faces the street? How It Operates Used most commonly at an island sink or vanity, the vents may be used to prevent roof penetrations (as seen above) on the front roof line elevation. In these rare cases, plumbers use an Air Admittance Valve.Īir Admittance Valves (aka Studor vents) are built with “negative-pressure-activated” one-way mechanical valves. Sometimes we can’t (or don’t want to) vent through the roof line. Never let a plumber work on a slate roof.Found during an 11-month builder warranty inspection. However, due to proper sloping of vent pipes, most homes will require at least two plumbing vents. Plumbing code now allows for a single 2" pipe to vent the entire house. Solder streaks and lead that turns white over time look lousy.Īll cast iron will eventually rust through, even vertical stacks. ![]() The condensation forms between the plumbing stack and the sleeve and then drips into the attic. which may have a life expectancy of 100 or 150 years?Ĭopper flashing that wraps around and over the vent stack often causes condensation (as warm vent gases come in contact with the copper in the Winter). The best ones last 30 years, but why use any of these on a slate roof. Standard plumbing vent kits deteriorate in 7 years. Rubber/plastic flashing kits should never be permitted on slate roofs. PVC through a slate roof looks terrible (even when painted) and a heavy snow load can break them. NEVER PERMIT PVC pipe penetrations through a slate roof. Scroll down below the pictures to continue reading.īuilders and remodelers sometimes ignore this rule, however, plumbing vent stacks should never be on the front of a home. ![]() So, our standard practice has evolved into cutting the stack in the attic and moving the vent to a desirable location. Anyway, there are many problems with the "current" methods of dealing with plumbing vents. Of course, over the last hundred years the flashing rusts, leaks or copper wraps get condensation between the old pipe and the copper (which drips into the attic). All cast iron will eventually be replaced. PVC is used throughout buildings in all new construction and remodels. Well, that made sense 100 years ago when working with heavy cast iron pipes, but that should no longer be the case. It is now our standard practice in our slate roofing business.īasically, the plumber has forever decided where vent stacks are placed. It is a maintenance free, lifetime solution that also looks attractive and blends in with the roof. Our design requires more work up front, but then installs just like a piece of slate and requires no flashing. A remodeling job a few years ago inspired this creative solution for plumbing vents and we are happy to help you as well if you ask.
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