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<div class="moz-cite-prefix">We use a stainless fender washer
between the lag and L foot both to prevent a galvanic reaction
between the aluminum and zinc plating, and to seal over the slot
in the L foot. It also increases the strength to prevent the lag
from tearing through the L foot in a heavy wind load. When we
tighten it down, we always make sure that we have sealant coming
out on all sides of the L foot, and the washer. We've also used
lags with rubber sealing washers too.<br>
<pre class="moz-signature" cols="72">R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760</pre>
On 4/16/2014 9:52 AM, <a class="moz-txt-link-abbreviated" href="mailto:don@energysolarnow.com">don@energysolarnow.com</a> wrote:<br>
</div>
<blockquote
cite="mid:20140416085240.8b71096d7d88573c67c7101a41a0e3ba.eae3bf21ec.wbe@email14.secureserver.net"
type="cite"><span style="font-family:Verdana; color:#000000;
font-size:10pt;">
<div>As Ray Walters wrote, L feet installed with the correct
sealant have lasted as long as the comp roofs they're <br>
on. <br>
</div>
<div>As can be seen in the attached pictures of L-feet on a roof
that I will soon be repairing, the wrong sealant eventually
shrinks and separates from the L-foot. Also the slotted hole
where the lag penetrates is exposed. That's why flashings are
used-- to cover up sealant that won't last. </div>
<div>Thanks for all the pointers to better sealants. </div>
<div><br>
</div>
<div>Don Barch</div>
<div>Energy Solar<br>
</div>
<div><br>
</div>
<div>Ray Walters <<a moz-do-not-send="true"
href="mailto:ray@solarray.com">ray@solarray.com</a>>
wrote:</div>
<blockquote id="replyBlockquote" webmail="1" style="border-left:
2px solid blue; margin-left: 8px; padding-left: 8px;
font-size:10pt; color:black; font-family:verdana;">
<div id="wmQuoteWrapper">....If I'm putting a 2 inch hole
through a roof, then that constitutes <br>
a penetration, and using a flashing is usually a good idea.
But when <br>
I'm filling a 1/4" hole with a 5/16" lag, its really much
closer to <br>
being a roofing attachment than a penetration.<br>
BTW, we're not just depending on some adhesive to stop the <br>
moisture. An L foot is really a 1/4" thick aluminum
flashing. It has <br>
at least 4 sq in. of surface area held permanently in place
by a <br>
mechanical fastener that is applying a significant amount of
downward <br>
pressure.<br>
..... L feet installed <br>
with the correct sealant have lasted as long as the comp
roofs they're <br>
on, 30 + years.</div>
</blockquote>
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