[RE-wrenches] to flash or not to flash

Sat Aug 8 12:51:58 PDT 2015

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

Gradient Cap_mini
Lic 773985
millersolar.com <http://www.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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