We did a shake roof, and used a quick mount flashing ( I believe) that
was 18" x 18". According to the directions, we had to use a roofing bar
to pull out the nails to insert the flashing up under the shake.
Missing nails the shakes were not secure on the neds, so we ended up
using sealant to try and hold the ends down over the flashing. I felt
the roof integrity suffered, but of course I can't believe that shake
roofs are even a viable roofing system, so that's another story.
On asphalt roofs, you need to cut part of the shingle away and also
remove nails from under the layer above. THe nails can tear through
both shingle layers when pulled, and you are now mising some of the
original roofing structure. You are also pulling apart the adhesive that
holds the shingles down to the layer below, leaving them vulnerable to
wind. Working with aging shingles on a cold day they may tear or crack,
while on a hot day you end up loosing some of the gravel.
Don't get me wrong, I'm not against flashings, I just question other
folks insistence that we are not living up to NABCEP values if we elect
to not use them.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 8/7/2015 12:08 PM, Jay wrote:
Hi Ray
Can you elaborate on how a large flashing can cause more damage than it
prevents?
Thanks
Jay
Peltz power
Sent from my iPhone
On Aug 7, 2015, at 10:34 AM, Ray Walters <r...@solarray.com> wrote:
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).
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-876
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