Hi,
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.
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.
Hope that helps,
Laura
--
Laura Uhler
Electrical Engineer
NABCEP Certified PV Installer
Solar Ki, LLC
Corvallis, Oregon
(541) 602-6909
laura.uh...@solarki.com
www.solarki.com
Kelly Keilwitz, Whidbey Sun & Wind wrote:
Laura,
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.
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?
Thanks,
-Kelly
Kelly Keilwitz, P.E.
Whidbey Sun & Wind, LLC
Renewable Energy Systems
NABCEP Certified PV Installer
987 Wanamaker Rd,
Coupeville, WA 98239
PH & FAX 360-678-7131
sunw...@whidbeysunwind.com
On 6/18/09 5:36 PM, "Laura Uhler" <laura.uh...@solarki.com> wrote:
Hi,
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.
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.
Good Luck!
Laura
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Laura Uhler, Owner
Solar Ki, LLC
(541) 602-6909
laura.uh...@solarki.com
www.solarki.com
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