Roofing Question [RE-wrenches]

[Steve Fain]

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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