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TomFlKeys · Dec 23, 2007, 03:03 AM

Our house is an older house, I was putting in a ceiling fan and had to remove some drywall over a closet. I noticed that a vent pipe (for kitchen) had fallen on the top of the closet. The pipe had a elbow in it hat had rusted (bad salt air problem here), when they were putting the new roof on (metal roof -better for hurricanes here); they probably removed all of the old flashing and putty around the vent pipe and it fell through the hole when they did this. When they put on the Ice and water shield they covered up the hole. Since there were 2 other vent pipes, they never noticed this. So the kitchen was venting in the drywall space above the kitchen. We never noticed any bad smell. We have our windows open much of the year. I really do not want to put the hole in the roof, because the seal will not be right because the pipe should have been through the roof before the metal and ice and water shield was put on. I read that they have one way air valves that can be used, but they sometimes fail. We have a 2 1/2 foot crawl space under the house. Where the vent pipe was rusted off at the elbow (the rest of the pipe is solid and has almost no rust, can I make a upside down 'u' come back down, go under the house in the crawl space and connect this vent pipe to one of the other 2 vent pipes. I problem I see with that is that it will have to be connected a point higher than where the second line drains into the sewer. I have created a trap if water somehow ever got into the vent pipe.

speedball1 · Dec 23, 2007, 06:20 AM

You sound like you're from my part of Florida. I live on the Gulf Coast south of Tampa.
You have two options, and a "upside down U" isn't one one of them. You can revent the kitchen vent back into another roof vent in the attic,**or** you can install a AAV,(air admittance vent) The easiest would be to install a AAV, (purchase a better one) on the kitchen vent line. 15 minutes work and the job's done. Regards, Tom. PS. I think tin roofs are cool! Especially when it rains. Good luck, Tom

TomFlKeys · Dec 23, 2007, 03:16 PM

Thank you for your reply. There is no attic, so I guess it is an AAV. Note, our metal roof is shaped like tile. So from a short distance it looks just like a tile roof, but each section goes from the top to side just like a regular metal roof.

TomFlKeys · Dec 23, 2007, 03:44 PM

Originally Posted by TomFlKeys

Our house is an older house, I was putting in a ceiling fan and had to remove some drywall over a closet. I noticed that a vent pipe (for kitchen) had fallen on the top of the closet. The pipe had a elbow in it hat had rusted (bad salt air problem here), when they were putting the new roof on (metal roof -better for hurricanes here); they probably removed all of the old flashing and putty around the vent pipe and it fell through the hole when they did this. When they put on the Ice and water shield they covered up the hole. Since there were 2 other vent pipes, they never noticed this. So the kitchen was venting in the drywall space above the kitchen. We never noticed any bad smell. We have our windows open much of the year. I really do not want to put the hole in the roof, because the seal will not be right because the pipe should have been thru the roof before the metal and ice and water shield was put on. I read that they have one way air valves that can be used, but they sometimes fail. We have a 2 1/2 foot crawl space under the house. Where the vent pipe was rusted off at the elbow (the rest of the pipe is solid and has almost no rust, can I make a upside down 'u' come back down, go under the house in the crawl space and connect this vent pipe to one of the other 2 vent pipes. I problem I see with that is that it will have to be connected a a point higher than where the second line drains into the sewer. I have created a trap if water somehow ever got into the vent pipe.

Dear Speedball1,
I forgot to ask, I have 2 sinks on the one vent. The one is 8 feet from the vent. Can I put 1 AAV on the existing vent pipe, or must I have an AAV for each sink? Do you recommend any specific brand?
Tom

speedball1 · Dec 24, 2007, 06:41 AM

Dear Speedball1,
I forgot to ask, I have 2 sinks on the one vent. The one is 8 feet from the vent. Can I put 1 AAV on the existing vent pipe, or must I have an AAV for each sink? Do you recommend any specific brand?
Tom

The distance's a little long at 8 feet, (code calls for 5" from trap to vent on a 2" drain) but we're not building a house that will be inspected are we? Use one AAV to vent both sinks. I lean toward Studor Vents manufactured just north of me in Clearwater. Don't purchase the cheaper ones used on mobile homes. Good luck, Tom