[RE-wrenches] Sealing roof vent

[William Dorsett]

So this is a plumbing vent instead of a furnace or hot water exhaust vent?
I’ve used Fernco rubber caps on unused vents, with the screw down pipe
clamps around the bottom. Also these are just to allow air into the vent so
draining water doesn’t create a vacuum so I suspect there is little to be
concerned about with cutting them off just above the roof flashing and
allowing enough room over the top to allow air to flow into it. On a three
inch vent that is only ¾” to equal the surface area of the pipe. The top of
the flashing is protected by the module over its top. Over time would there
be sewer gases which might cause trouble on the back sheet of the module? I
don’t know.

 

Bill Dorsett

Manhattan, KS

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Drake
Sent: Thursday, October 03, 2013 8:03 AM
To: RE-wrenches
Subject: [RE-wrenches] Sealing roof vent

 

Hello Wrenches,

We are moving a roof vent. My plumber suggested that we cut the old one and
cap it instead of having to repair the roof. I'm not sure a capped vent
would be short enough to fit under the array.  

What if we were to cut the vent off at the flashing level and plug the pipe.
A rubber plug could be put in and topped with hydraulic water-stop cement.
Neoprene roof sealant could be spread on top of that.

Has anyone tried anything like that? Are there any other good options? Can
you see any issues with this method?

Thanks,

Drake 

Drake Chamberlin
Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV 
740-448-7328
http://athens-electric.com/ 
 

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