[RE-wrenches] Sealing roof vent

[Drake]

Hi Benn,

The vent is on a metal roof with a roof block 
instead of a flashing. Your second option sounds 
the best. The main concern about using a cap is 
that the abandoned vent might still be too high 
to put a module over. From the roof surface to 
the bottom of the module will be about 5 to 5 1/2 inches.

Emacs!


Thanks,

Drake


At 06:03 PM 10/3/2013, you wrote:
>Drake,
>If you are relocating the vent and abandoning 
>the existing hole then could you not just cut 
>the vent flush to the roof or cut it right out 
>and slide a "flashing" up under the above 
>shingles to cover the hole, rather than plugging and filling the vent?
>
>Or...
>Given the pitch of the roof and the height of 
>the array off the roof surface, can you cut the 
>vent as low as possible to cap it and seal the cap (PVC cement if a PVC pipe).
>
>benn
>Sent from a 'smart' phone, with touch screen 
>keys. Please excuse shortcuts and typos.
>
>On 2013-10-03, at 3:45 PM, Drake 
><<mailto:drake.chamberlin at redwoodalliance.org>drake.chamberlin at redwoodalliance.org> 
>wrote:
>
>>Hi Max and Bill,
>>
>>Thanks for your input. The actual plumbing vent 
>>will be rerouted to go out of the north pitch 
>>of the roof.  There will only be a an open pipe 
>>left in the attic. The main issue is finding 
>>ways of keeping water out of the vent pipe (now 
>>abandoned) and getting it short enough to fit 
>>under the array. I think a cap on the pipe 
>>would make it too high, so I'm looking for other ways to seal it.
>>
>>Drake
>>
>>At 11:19 AM 10/3/2013, you wrote:
>>>Content-Type: multipart/alternative;
>>>         boundary="----=_NextPart_000_0020_01CEC022.1E610960"
>>>Content-Language: en-us
>>>
>>>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: 
>>><mailto:re-wrenches-bounces at lists.re-wrenches.org>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/>http://athens-electric.com/
>>>
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