[RE-wrenches] to flash or not to flash

Sat Aug 8 18:05:12 PDT 2015

Wrenches
We stay away from anything with a rubber type boot as it will shrink over time in the shade of the array or not. You all night want to look at the sunmodo out of Washington. Have had no leak issues or installation issues, there is no exposed rubber and the flashing is malleable and can be shaped around the roofing materials and does not lift up on the corners
Jerry

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<div>-------- Original message --------</div><div>From: William Dorsett <wmdorsett at sbcglobal.net> </div><div>Date:08/08/2015  9:51 AM  (GMT-10:00) </div><div>To: 'RE-wrenches' <re-wrenches at lists.re-wrenches.org> </div><div>Subject: Re: [RE-wrenches] to flash or not to flash </div><div>
</div>I agree with Ray on this, but think the neoprene boot here is so badly separated more likely because the house is settling around it. Still it cracked due to UV and would have failed anyway.

Bill Dorsett
Manhattan,  KS

From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Wayne Irwin
Sent: Friday, August 07, 2015 4:20 PM
To: Wrenches
Subject: Re: [RE-wrenches] to flash or not to flash

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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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