[RE-wrenches] L feet no flashing in shingle roof

Drake drake.chamberlin at redwoodalliance.org
Mon Jul 2 15:58:15 PDT 2012


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:jay at asis.com>jay at 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-bounces at lists.re-wrenches.org>re-wrenches-bounces at lists.re-wrenches.org 
>>[mailto:<mailto:re-wrenches-bounces at lists.re-wrenches.org>re-wrenches-bounces at 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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