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<p>OK, I'll stick my neck out. We've done very few flashings on
comp for the last 18 years or so, using (first) the highest
quality polyurethane caulk we could find. However, for the last
10 years we've been using Geocell 4500 which states on the tube
that it is compatible with asphalt/comp shingles. For a variety
of reasons not related to leaks, we've had to pull some of these
L-feet to which we saw there was a bond/seal to the shingle like
it had been welded to it. The Geocell was still extremely
flexible.</p>
<p> Whenever (infrequently) there's a chance we look for
stains on roof decking and rafters if we're in the attic of an old
install. Of course there is the need to think about what you're
doing when your applying the bead with regard to location and
quantity of caulking and be conscious of torque applied to the lag
bolt, being sure you get some caulking squeezed out the side of
the L-foot, covering the head of the lag bolt with caulk also.
Its a bit of an art we take seriously. So far as we know, no
leaks with thousands of L-feet. <br>
</p>
<p> Oh, and flashings are good too, but are not perfect.</p>
<p>Bill</p>
<pre class="moz-signature" cols="72">Feather River Solar Electric
Bill Battagin, Owner
4291 Nelson St.
Taylorsville, CA 95983
530.284.7849
CA Lic 874049
<a class="moz-txt-link-abbreviated" href="http://www.frenergy.net">www.frenergy.net</a></pre>
<div class="moz-cite-prefix">On 4/21/2021 7:40 AM, Jeremy Coxon
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:E6927DF7-3AFA-4AB3-9BB3-6DF80E0F8582@sunwindpowerinc.com">
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I\u2019m interested in what the group has to say about the trend, by
the racking manufacturers, away from the use of flashings for
asphalt/comp roofs? We have long used SnapNRack flashings with
much success. I especially like the fact that the penetrations
are fully flashed and do not rely on sealant. I am NOT a fan of
their new raised cone/epdm gasket flashing. There are a number of
these raised cone flashings in the marketplace and it\u2019s my
experience that they don\u2019t hold up to the test of time and I
wonder what the roofing manufacturers have to say about this.
<div class=""><br class="">
</div>
<div class="">I see that Unirac, SnapNRack and others are now
offering basically a sealed L-Foot which is essentially where we
were 15-16yrs ago and met with a lot of opposition from the
roofing industry. Just interested to hear what you guys are
using these days on asphalt shingle roofs for reliably dry
attachments? <br class="">
<div class="">
<div style="font-family: Helvetica; font-size: 12px;
font-style: normal; font-variant-caps: normal; font-weight:
normal; letter-spacing: normal; orphans: auto; text-align:
start; text-indent: 0px; text-transform: none; white-space:
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-webkit-text-size-adjust: auto; -webkit-text-stroke-width:
0px; text-decoration: none; caret-color: rgb(0, 0, 0);
color: rgb(0, 0, 0);"><br class="">
Best Regards,<br class="">
Jeremy Coxon NABCEP # 091308-21<br class="">
MWBE Certified<br class="">
</div>
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font-family: Helvetica; font-size: 12px; font-style: normal;
font-variant-caps: normal; font-weight: normal;
letter-spacing: normal; orphans: auto; text-align: start;
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widows: auto; word-spacing: 0px; -webkit-text-size-adjust:
auto; -webkit-text-stroke-width: 0px; text-decoration:
none;"></span><br class="Apple-interchange-newline">
<br class="">
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