sloped roof penetrations [RE-wrenches]

[Conrad Geyser]

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Hi Steve & all,
I've heard this prejudice against silicone before.
Most of the work we do in the NorthEast here is on sloped asphalt roofs.
We use silicone on our penetrations.
I've moved a couple hundred 1980's systems most of which were bedded in 
silicone.
The only time I've seen leaks is where there was obvious problems with the 
attachment.
The silicone is protected from UV degredation under the fittings / array, 
and it stays very nice and flexible and very well bonded to all the surfaces 
including the metal.  Getting it apart can actually be the problem.
The only caveat is that it won't bond to wet surfaces, no finishing up as 
the rain is starting!

Conrad Geyser
Cotuit Solar

----- Original Message ----- 
From: "Steve Fain" <sfain at unirac.com>
To: <RE-wrenches at topica.com>
Sent: Friday, January 26, 2007 1:24 PM
Subject: RE: Roofing Question [RE-wrenches]


>
> Hi Bruce,
> I'm one of the "lurkers" on the Wrenches List, a corporate
> representative not allowed to post unless responding to a direct question 
> or
> issue on the list, but in this instance I feel it necessary to pipe up 
> with
> some important info I learned recently, so that you Wrenches can learn 
> from
> my mistakes.
> As a residential contractor for over 20 years, I used
> premium-quality polyurethane-based sealants, including Sikaflex, for 
> almost
> every exterior caulking application.  Good handling characteristics, 
> sticks
> well to most surfaces without a lot of prep, plenty of colors available, 
> and
> flexible for ever.  It was with great horror that I learned recently from 
> a
> customer who had spoken with a tech support rep from Sikaflex, that
> polyurethane-based sealants are not compatible with petroleum-based
> substances, ie. comp shingles and tar roofs.  The best recommendation I've
> heard so far for sealing  petroleum-based components is to use butyl 
> rubber
> caulk.
>
> ...and while I'm at it (sorry, Michael!), here's another little kernel of
> wisdom I learned in the "Cub Scouts":  Never use silicone caulk where 
> it'll
> be exposed to the elements.  The stuff just doesn't stick well without a 
> lot
> of prep and loses elasticity with exposure to weather.
>
> Steve Fain
> Customer Service/ Tech Support
> UniRac, Inc.
> 1411 Broadway Blvd. NE
> Albuquerque, NM   87102-1545
> Ph:  505-242-6411 ext. 21
> Fx:  505-242-6412
> Email:  sfain at unirac.com
> Web:   http://www.unirac.com
>
>
> -----Original Message-----
> From: Bruce Leininger [mailto:bruce.leininger at sbcglobal.net]
> Sent: Tuesday, January 23, 2007 5:01 PM
> To: RE-wrenches at topica.com
> Subject: Roofing Question [RE-wrenches]
>
>
> Hi.  I'm wondering how other installers are sealing penetrations in flat
> roofing systems like modified bitumen and tar & gravel.  I've heard of
> everything from "just seal it with Sikaflex" to, you have to seal it the
> way the roof was initially installed:  e.g. torch down and cold-applied
> adhesive for the modified bitumen and hot tar for the tar & gravel.
>
> Anybody have any stories about what happens when you try to go the "just
> sikaflex it" route instead of using the original roofing method?  Has
> anybody made penetrations in either type of roofing system that has been
> leak-free for 20+ years?
>
> Thanks.
>
> Bruce
>
>
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>
> 


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