How do you flash your L feet without using a standoff?
At 07:49 AM 7/2/2012, you wrote:
I've found that the Flashed L-Foot connection costs about $0.10/w on
a typical residential system, and only adds about 1/4-1/2" to the
height, which can be minimized using the slotted holes in a typical
L-Foot. We need a lot of attachments for 172 mph design wind speeds
around here. Flashings at $500 for a 5kW seems high, especially now
as the percentage of the system price increases. That being said, I
would install L-Foot flashings on my own roof - no exceptions.
On the other hand, I've seen sealed lag screw connections work with
solar pool heating systems for decades without indication of
problems. A variety of sealants were used in the "old days" but most
recently Sikaflex 1A (which incidentally is not indicated for
asphaltic roofs) and Geocell 2300 have worked great.
My 10 cents, :)
Jason Szumlanski
Fafco Solar
On Fri, Jun 29, 2012 at 10:49 AM, jay peltz
<<mailto:j...@asis.com>j...@asis.com> wrote:
I have had the opportunity in the past few years to learn a lot
about good roofing waterproofing practices according to the national
roofers association.
They don't agree that caulk works as the primary means of sealant,
which is what you are doing with an L foot.
And given that we have really good off the shelf approved flashed
feet, why would you use anything else?
My 2 cents,
Jay
peltz power
On Jun 29, 2012, at 5:16 AM, Glenn Burt wrote:
We have used a variety of sealants over the years, and determined
simple Henry roofing cement is the best product for use on comp roofing.
We also used to bend our own L-foot flashing, which we cut from
standard Al coil stock (before all the manufactured options were
available). This might be a good option for you in this case.
Glenn
From:
<mailto:re-wrenches-boun...@lists.re-wrenches.org>re-wrenches-boun...@lists.re-wrenches.org
[mailto:<mailto:re-wrenches-boun...@lists.re-wrenches.org>re-wrenches-boun...@lists.re-wrenches.org]
On Behalf Of Drake
Sent: Thursday, June 28, 2012 6:40 PM
To: RE-wrenches
Subject: [RE-wrenches] L feet no flashing in shingle roof
I'm quoting a job that has an existing array with L feet bolted
down to a shingle roof with no flashings. I want to match the
height of the existing array. Also some modules are being worked
in around skylights where it is unlikely that room would be
available for flashings to center over rafters.
I've always used flashings. Would it be completely crazy to follow
suit of the existing array and bolt L feet straight to the shingle
roof with good roof sealant? If so, how would you seal it?
Thanks,
Drake
Drake Chamberlin
ATHENS ELECTRIC LLC
OH License 44810
CO license 3773
NABCEP Certified PV
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Drake Chamberlin
ATHENS ELECTRIC LLC
OH License 44810
CO license 3773
NABCEP Certified PV
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