Flashing "L" Feet [RE-wrenches]
Jeff Clearwater
clrwater at earthlink.net
Mon Feb 27 09:46:11 PST 2006
<x-flowed>
Hi Dean and Ken,
Yes Dean, that's exactly what I was picturing. I don't worry much
about an exposed lag on "L" feet under the array in CA, but with most
perimeter mounting systems (e.g. sunframe, Flushmount) the top row of
"L" feet are exposed to UV. Also all feet are exposed to ice damning
in my New England jobs.
This list has discussed this many times before, and the general drift
was post and flashing for new construction and "L" feet or Tile Trac
on top of comp okay for newish retrofit comp. But when I saw the
Flat Jack, I started to reconsider. I've also had customers question
the exposed lagged L feet.
So your method Dean sounds pretty appealing to me (given the $17.50
price of Flat Jacks). The nice thing abut the fast jacks is they
have a dome for the lag bolt and then a block for mounting systems
that need a vertical post rather than the horizontal bolt you get
with L feet. But a couple of Ls solve the orientation (or using
powerrail or unirac) and the lag is not really thick enough to cause
a problem with flat flashing.
Anyone else?
peace,
Jeff Clearwater
Village Power Design
>
>Hi Jeff and Ken,
> I have been using L-Feet on composite shingle roofs and have manufactured=
>
>my own flashing. I use 8" x 25' aluminum flashing rolls then cut to 8x8's
>with a tab in the center of one side that is as wide as the L-Foot and up
>onto the flashing approximately 2". The pilot hole for the s/s lag is the=
>n
>drilled 1/2" down from the comp tile edge at CL of the joist below. The ta=
>b
>is then bent 90 deg up then bent over in half for L-Foot clearance, then it=
>
>is slid under the shingle above. At this point I use a fair amount
>of polyurethane sealant and then screw down the L-Foot which should yield a=
>
>fair amount of squeeze-out on all sides of the lag. The flashing is then
>pulled down so the tab is against the L-Foot and the lower edges of
>the flashing is attached using 1 1/2" roofing nails with sealant on the
>heads. PLEASE comment if I'm creating an issue for myself. Thanks,
>Dean Ferreira
>
>
>On 2/27/06, Ken Schaal <ken at commonwealthsolar.com> wrote:
>>
>> Your free subscription is supported by today's sponsor:
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>>
>> Thoughts from an old thermal guy------
>>
>> For over 25 years I have used, with no leaks, silicone caulk under
>> mounting feet, in the lag screw hole, and over the head of the lag. Simpl=
>e
>> ,
>> cheap, reliable. Since the shingles under the panels are protected from U=
>V
>> radiation and heat they last MUCH longer than those at the perimeter of
>> the
>> array. Having to now too often go back and R&R collectors for reroofs, I
>> have started placing flashing around the perimeter , especially at the
>> lower portion of the array , so as to allow reroof with out disturbing th=
>e
>> array.
>>
>> If we really want to save energy and resources--be green-- in the long=
>
>> term, then I believe this is an issue that the PV industry needs to
>> address
>> even more than SHW , due to the time involved with larger areas. Or will=
>
>> we -- the solar industries as a group--follow the typical short term
>> thinking of others ?
>>
>> As the ethical leaders of the solar installation part of this effort t=
>o
>> use renewable energies, which is after all, about long term thinking, how=
>
>> do
>> you all approach, and/or resolve, this issue?
>>
>> Thanks for your thoughts
>>
>> Ken Schaal
>> CommonWealth Solar,LLC
>>
>>
>>
>>
>>
>>
>> ----- Original Message -----
>> From: "Jeff Clearwater" <clrwater at earthlink.net>
>> To: <RE-wrenches at topica.com>
>> Sent: Monday, February 27, 2006 4:32 AM
>> Subject: Flashing "L" Feet [RE-wrenches]
>>
>>
>> > Esteemed Wrenches, (and you too Matt - just kidding)
> > >
>> > Anyone try the new TTI Flat Jacks for comp roof retrofits?
>> > http://www.thompsontec.com/
>> >
>> > I love the idea of a flashed comp retrofit rather than simply an L
>> > foot or Tile Trac directly on comp but I'm having a hard time
>> > justifying the price.
>> >
>> > But I was looking at the pieces of the Flat Jack and thinking it must
>> > not be too hard to flash an L foot. Anyone out there flashing L
>> > feet? Method? off the shelf flashing that makes it easy? Or are
>> > folks using flashing on retrofit comp posts?
>> >
>> > Thanks,
>> >
>> > Jeff C.
>> > Village Power Design
>> > --
>> > ~~~~~~~~~~~~~
>> > Jeff Clearwater
>> > Village Power Design Associates
>> > Sustainable Energy & Water Solutions for Home & Village
>> > http://www.villagepower.com
>> > gosolar at villagepower.com
>> >
>> > 530-470-9166
>> > 877-SOLARVillage
>> > 877-765-2784
>> > 425 Nimrod St.
>> > Nevada City, CA 95959
>> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`~
>>
>> Your free subscription is supported by today's sponsor:
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>>
>> - - - -
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>>
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>>
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>>
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>>
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>>
>> Moderator: michael.welch at homepower.com
>>
>>
>>
>
>
>--
>
>NorCal Solar Electric
>Dean Ferreira (650) 515-0465
>Jeanie Ferreira (650) 245-2550
>
>[Non-text portions of this message have been removed]
>
>Your free subscription is supported by today's sponsor:
>-------------------------------------------------------------------
>Shopping for a new car?=20
>Pay 2-3% below invoice on a new car of your choice.=20
>Save thousands with our free car discount finder service!
>http://click.topica.com/=
>caaerMmbz8Qcsa9hBZif/Dealix
>-------------------------------------------------------------------
>
>- - - -
>To send a message: RE-wrenches at topica.com
>
>Archive of previous messages: http://lists.topica.com/lists/RE-wrenches/rea=
>d
>
>List rules & how to change your email address: www.mrsharkey.com/wrenches/e=
>tiquette.php
>
>Check out participant bios: www.mrsharkey.com/wrenches/
>
>Hosted by Home Power magazine
>
>Moderator: michael.welch at homepower.com
--
~~~~~~~~~~~~~
Jeff Clearwater
Village Power Design Associates
Sustainable Energy & Water Solutions for Home & Village
http://www.villagepower.com
gosolar at villagepower.com
530-470-9166
877-SOLARVillage
877-765-2784
425 Nimrod St.
Nevada City, CA 95959
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`~
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