[RE-wrenches] to flash or not to flash

Fri Aug 7 14:20:17 PDT 2015

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Date: Fri, 7 Aug 2015 17:11:50 -0400
From: kjenergysystems at gmail.com
To: re-wrenches at lists.re-wrenches.org
Subject: Re: [RE-wrenches] to flash or not to flash

Not that the names of things matter that much but imho "flashing" does require an overlapping of some kind. An Oatey boot for a metal roof is more of a bedded fitting than a flashing. It relies entirely on fasteners and a sealing membrane whereas flashings rely mostly on natural forces like gravity. Perhaps an experienced roofer weigh in on this.

Kurt Johnsen

On Fri, Aug 7, 2015 at 3:21 PM, Jason Szumlanski <jason at floridasolardesigngroup.com> wrote:
"If you place a flat object on top of roofing without an uphill material lapping over the downhill object, you are not flashing. "
By that logic, an Oatey boot is not a flashing for a plumbing vent on a metal roof.
Just sayin'...

Jason Szumlanski

On Fri, Aug 7, 2015 at 2:19 PM, William Miller <william.miller at millersolar.com> wrote:
Ray: I have to respectfully disagree with your semantics.  A flashing is an overlapping of roofing materials such that gravity will direct rain and melt water off of the roof.  This is a universally accepted waterproofing method that does not depend on any sealant material.  The concept is as ancient as the first, crude, thatched roof. If you place a flat object on top of roofing without an uphill material lapping over the downhill object, you are not flashing.   What you have described is sealant-dependent weatherproofing.  Regardless of the quality of the sealant, or lack thereof, I don’t think you can call it a flashed attachment. (The overarching point is a flashed attachment does not depend on a sealant.  Any sealant has a finite lifespan.  Removing the sealant variable from the equation results in more lasting installation.) Sincerely, William Miller  
Lic 773985
millersolar.com
805-438-5600 From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Ray Walters
Sent: Friday, August 07, 2015 10:34 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] to flash or not to flash My opinion is that if the L foot has enough surface area it constitutes a flashing, and that large flashings can actually cause more damage to the roof than they prevent.
I also agree that an attachement doesn't constitute a penetration.  I just finished an install on a metal roof with hundreds of screw holes.  We added a few more screw holes, and ours have 20 times the sealant surface area.  We did run a 1" conduit through the roof, and since it was an actual penetration, we used a very expensive flexible boot flashing.
Personally, I think we need about a 3"x3" or 4" x 4" L foot with a double stick butyl tape on the bottom, and all will be well.
I realize that the OP was referring to asphalt, but I will flash other roof types that don't do well with L feet ( like shake).

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