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sealing roof vents [message #71074]

Sun, 17 January 2010 19:12

jayrabe

Messages: 509
Registered: June 2009
Location: Portland, OR

Karma: 0

Senior Member

Got my new roof vents. Now to install them. I see there's a flange that's screwed down, so the first question is recommendations for screws (presumably SS?), and the second question is, do I put any kind of sealant under the flange? As you can see from the pictures, the PO had doped a bunch of some kind of sealant on the top of the flange at one time, but it's all cracked and presumably leaking now.

http://www.gmcmhphotos.com/photos/showgallery.php?cat=5390

J "still with a lot to learn" Rabe
76 Palm Beach
Portland, OR

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Re: sealing roof vents [message #71085 is a reply to message #71074]

Sun, 17 January 2010 21:44

Larry C

Messages: 1168
Registered: July 2004
Location: NE Illinois by the Illino...

Karma: 0

Senior Member

do I put any kind of sealant under the flange?
___________________________________________________________

I used 3M 4000 UV polyether adhesive.

http://www.westmarine.com/webapp/wcs/stores/servlet/producte/10001/-1/10001/81606/377%20710/0/3m%20sealant/Primary%20Search/mode%20matchallpartial/0/0 ?N=377%20710&Ne=0&Ntt=3m%20sealant&Ntk=Primary%20Search&Ntx=mode%20matchallpartial&Nao=0&Ns=0&keyword=3m%20sealant&isL TokenURL=true&storeNum=5000&subdeptNum=4&classNum=318

I bought it at West Marine.
I used on Gatsbys' CRUISER Very Happy

3 years ago and it has not cracked and it is holding the paint.

On the vents, I put the sealant under the flange and around the screws when I screwed them down.

If you wanted to be extra sure of no leak, you can run a bead over the screw heads and along the vent edges but that may be overkill.

LarC ( Been down the long road of sealants and found this one to finally work well )

Gatsbys' CRUISER

08-18-04
74 GLACIER X, 260/455-APC-4 Bagg'r
Remflex Manifold gaskets
CampGrounds needed, Add yours to "PLACES" /> http://www.gmceast.com/travel
_

[Updated on: Sun, 17 January 2010 21:46]

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Re: [GMCnet] sealing roof vents [message #71086 is a reply to message #71074]

Sun, 17 January 2010 21:48

Carleton Douglas[1]

Messages: 174
Registered: March 2006

Karma: 0

Senior Member

For under the flange use putty tape the best you can get from a RV
supply and when it is fully assembled us a lap seal also from an RV
supply

On Sun, Jan 17, 2010 at 6:12 PM, Jay Rabe <jayrabe@hotmail.com> wrote:
>
>
> Got my new roof vents. Now to install them. I see there's a flange that's screwed down, so the first question is recommendations for screws (presumably SS?), and the second question is, do I put any kind of sealant under the flange? As you can see from the pictures, the PO had doped a bunch of some kind of sealant on the top of the flange at one time, but it's all cracked and presumably leaking now.
>
> �http://www.gmcmhphotos.com/photos/showgallery.php?cat=5390
>
> J "still with a lot to learn" Rabe
> 76 Palm Beach
> Portland, OR
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>

--
Carleton Douglas
73 custom, by myself
Prescott, AZ
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