[RE-wrenches] to flash or not to flash

Jason Szumlanski jason at floridasolardesigngroup.com
Fri Aug 7 12:21:41 PDT 2015


"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
>
>
>
>
>
> [image: 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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