[RE-wrenches] to flash or not to flash

[William Miller]

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
 <http://www.millersolar.com/> 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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