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Hi,<br>
<br>
I agree that sealant should be placed in the pre-drilled holes. In my
notes, I wrote to use a butyl sealant as it does not degrade. However,
I'm not a chemical engineer or roofer, and definitely I don't claim to
understand why. In talking with the roofer, I asked how I could
achieve a 40+ year solution, and that was the advise I was given. I
also agree that penetrating any roof is a huge potential liability and
should not be done lightly.<br>
<br>
Almost all of the double layer of EternaBond stays under the L-foot -
only about a 1/4 inch bulges out the sides and into the center hole. <br>
<br>
Hope that helps,<br>
<br>
Laura<br>
<br>
<div class="moz-signature">-- <br>
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<title>signature</title>
Laura Uhler<br>
Electrical Engineer<br>
NABCEP Certified PV Installer<br>
Solar Ki, LLC<br>
Corvallis, Oregon<br>
(541) 602-6909<br>
<a class="moz-txt-link-abbreviated" href="mailto:laura.uhler@solarki.com">laura.uhler@solarki.com</a><br>
<a class="moz-txt-link-abbreviated" href="http://www.solarki.com">www.solarki.com</a><br>
</div>
<br>
<br>
<br>
Kelly Keilwitz, Whidbey Sun & Wind wrote:
<blockquote cite="mid:C6605171.1C5A0%25kelly@whidbeysunwind.com"
type="cite">
<title>Re: [RE-wrenches] Metal roof support flashing</title>
<font face="Verdana, Helvetica, Arial"><span style="font-size: 12pt;">Laura,<br>
I attended that seminar, too....the statistics on the overwhelming high
percentage of liability cases being due to water incursion into the
building made me sit up and pay attention.<br>
<br>
Do you know if the “EternaBond” sealant is compatible with polyurethane
sealant? I would prefer to fill our pre-drilled holes with sealant
before applying the lag bolt. Does enough of the tape/sealant remain
under the stanchion base to maintain separation between the metals?<br>
<br>
Thanks, <br>
-Kelly <br>
<br>
</span></font><span style="font-size: 12pt;"><font face="Arial">Kelly
Keilwitz, P.E.<br>
</font></span><font face="Arial"><span style="font-size: 11pt;">Whidbey
Sun & Wind, LLC<br>
Renewable Energy Systems<br>
NABCEP Certified PV Installer<br>
987 Wanamaker Rd, <br>
Coupeville, WA 98239 <br>
PH & FAX 360-678-7131<br>
<a moz-do-not-send="true" href="sunwind@whidbeysunwind.com">sunwind@whidbeysunwind.com</a><br>
</span></font><font face="Verdana, Helvetica, Arial"><span
style="font-size: 12pt;"><br>
<br>
On 6/18/09 5:36 PM, "Laura Uhler" <<a moz-do-not-send="true"
href="laura.uhler@solarki.com">laura.uhler@solarki.com</a>> wrote:<br>
<br>
</span></font>
<blockquote><font face="Verdana, Helvetica, Arial"><span
style="font-size: 12pt;">Hi,<br>
<br>
I talked with the roofer who gave the "Best Roofing Practices for PV"
course at the NW Solar Expo, and at the Oregon Dept of Energy. I then
took his recommendation and ran it by two local roofing professionals,
who similarly approved. They recommended using the EternaBond "Tape"
product. It looks like a 1/4" thick pre-rolled roof caulking. I get
it in 2" wide rolls, or, you may be able to purchase it pre-cut. (It's
not cheap.) You peel off the plastic outer layer and put it on the
back of the L-feet. I put on a double layer. It becomes activated by
pressure, so, when you screw your stainless steel lag bolts (with
washers) into the underlaying rafters, the EternaBond will ooze up in
to fill the cavity between the washer and oval L-foot hole.<br>
<br>
I'd recommend that you allow yourself several hours to cut the
EternaBond and pre-apply it to the L-feet before bringing the hardware
on the roof. That way, only the final layer of plastic needs be
removed before screwing the L-foot onto the roof. But, be warned, even
with a top plastic layer on the "tape", the EternaBond will stick to
everything! There is no doubt that this is a much more solid,
waterproof connection than the dollops on caulking around the six
screws that must hold down every boot.<br>
<br>
Good Luck!<br>
<br>
Laura<br>
</span></font></blockquote>
<font face="Verdana, Helvetica, Arial"><span style="font-size: 12pt;"><br>
</span></font><font face="Arial"><span style="font-size: 11pt;"><br>
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style="font-size: 9pt;"> <br>
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style="font-size: 12pt;"><br>
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<br>
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Laura Uhler, Owner<br>
Solar Ki, LLC<br>
(541) 602-6909<br>
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