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Freezing sewer vent pipes
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<blockquote data-quote="Motor Mouse" data-source="post: 199694" data-attributes="member: 703"><p>SLE, your t, how far does it stick down into your vent? A copper t like most I see being sold will not do it in this cold weather! Period. The copper heats up some by the warm sewer gas but your attic should be close to the outside temp then you have a foot or two of plastic vent pipe sticking above the roof. How can we expect a piece of copper maybe sticking in the vent pipe a couple of feet to keep the vent open when the sewer gas it self is frosting up. You simply don’t get enough heat transfer from the sewer gas to the copper to do any good when it is very cold. Let’s say your vent sticks above your roof line 18 inches and inside your attic it is 4.5 feet from your roof line to your inside ceiling that the vent pipe penitrates up through. You need the copper to be; 18” + 4.5’ + about 3 ‘ extending inside the vent pipe below your ceiling level (inside the heated space). So you would need that copper t to be 8’ long. With this that 3 foot of pipe sticking in the heated space as well as the warm sewer gas at that level heats the copper pipe and because copper is such a good conductor of heat it keeps the copper in the cold section of your vent warm enough to stop the frost build up. Someone asked about making one out of pvc painted black...won’t work.</p><p></p><p>Do this and there will be no more discussion on the subject needed!</p></blockquote><p></p>
[QUOTE="Motor Mouse, post: 199694, member: 703"] SLE, your t, how far does it stick down into your vent? A copper t like most I see being sold will not do it in this cold weather! Period. The copper heats up some by the warm sewer gas but your attic should be close to the outside temp then you have a foot or two of plastic vent pipe sticking above the roof. How can we expect a piece of copper maybe sticking in the vent pipe a couple of feet to keep the vent open when the sewer gas it self is frosting up. You simply don’t get enough heat transfer from the sewer gas to the copper to do any good when it is very cold. Let’s say your vent sticks above your roof line 18 inches and inside your attic it is 4.5 feet from your roof line to your inside ceiling that the vent pipe penitrates up through. You need the copper to be; 18” + 4.5’ + about 3 ‘ extending inside the vent pipe below your ceiling level (inside the heated space). So you would need that copper t to be 8’ long. With this that 3 foot of pipe sticking in the heated space as well as the warm sewer gas at that level heats the copper pipe and because copper is such a good conductor of heat it keeps the copper in the cold section of your vent warm enough to stop the frost build up. Someone asked about making one out of pvc painted black...won’t work. Do this and there will be no more discussion on the subject needed! [/QUOTE]
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