<html><body><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 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></span></body></html>