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Old 01-03-2009, 10:30 AM   #1
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PVC Leak


I have a 3Ē pvc pipe thatís a vent for my furnace. The pipe is dripping a small amount at a coupling I assume due to condensation. Does anyone know a way to reliably fix a leak in a pvc joint without cutting it out and replacing the section?

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Old 01-03-2009, 11:10 AM   #2
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PVC Leak


Sometimes if it's a slow small leak not under pressure as yours seems to be, you can just swab a little PVC cement around the edges of the fitting, and that will seal it. PVC cement is actually a solvent that "welds" the two separate pieces together when properly applied.
Should do it.
Good Luck!
Mike

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Old 01-03-2009, 04:59 PM   #3
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PVC Leak


Not to conflict with Mike's comments and only because this is furnace pipe, double check your work. On PVC vent pipes in my area the codes have changed recently for specific pipe and glue types that must match. I don't know those codes, or pipe info as it is larger diameter than mine, however, I have stumbled across some of the info in the past 4 weeks at HD.
I have worked with 2" PVC for 20 years and had little success in creating a perfect air tight seal after a joint has set with a leak. I normally break or cut the joint and replace it however mine must be air tight as it is vac tubing. Given that you could be dealing with exhaust fumes be doubley certain that you have good results.
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Old 01-03-2009, 05:05 PM   #4
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All great points! Listen to the Chemist.
Mike
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Old 01-03-2009, 08:34 PM   #5
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PVC Leak


Thanks for the inputs. I'll look into the codes for pipe and glue type.
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Old 01-03-2009, 11:03 PM   #6
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One of the things you will find with the codes as far as glue, is that there is no such thing as an all purpose glue. Each type pipe must be glued with the proper type cement. Many people also skip buying a $2 can of primer and pay for it later.
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Old 01-04-2009, 07:15 AM   #7
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PVC Leak


Clean the joint with primer. Attach a shop vac to the top of your vent on the roof. This will pull the primer into the crack. Now do the same with the glue. Try to seal off the beginning of the run also if possible. The vac will suck the glue into the leak. Works every time.
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Old 01-04-2009, 09:07 AM   #8
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PVC Leak


Thanks, I like the sucking solution. I really do think that this would be a very handy approach. An excellent idea to keep in your bag of tricks. It may be hard to get the vac on the roof. In this case I think I will try to replace the section.

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