[RE-wrenches] Sealing roof vent

[Benn At DayStarSolar]

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 <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: 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/ 
>>  
>> _______________________________________________
>> List sponsored by Home Power magazine
>> 
>> List Address: RE-wrenches at lists.re-wrenches.org
>> 
>> Change email address & settings:
>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org 
>> 
>> List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>> 
>> List rules & etiquette:
>> www.re-wrenches.org/etiquette.htm
>> 
>> Check out participant bios:
>> www.members.re-wrenches.org
> _______________________________________________
> List sponsored by Home Power magazine
> 
> List Address: RE-wrenches at lists.re-wrenches.org
> 
> Change email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
> 
> List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
> 
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
> 
> Check out participant bios:
> www.members.re-wrenches.org
> 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20131003/a34a3250/attachment-0003.html>