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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I recommend the hydraulically pressed ballast block over the non
hydraulically pressed kind.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'> cwarfel
[mailto:cwarfel@entech-engineering.com] <br>
<b>Sent:</b> Monday, July 2, 2018 1:08 PM<br>
<b>To:</b> re-wrenches@lists.re-wrenches.org<br>
<b>Subject:</b> Re: [RE-wrenches] crumbling ballast blocks<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p><span style='font-family:"Verdana","sans-serif"'>I am not trying to prolong
this thread, but I do want to say that there should be an inspection of the
blocks in freeze/thaw areas. We started an inspection program of our
systems or systems in the area and although we don't install ballasted systems,
we found enough other things to address. On my own 8 year old system zip tie
failure was over 50%. It opened my eyes to the need to do these
inspections, and spec better materials at the start. </span><o:p></o:p></p>
<p><span style='font-family:"Verdana","sans-serif"'>I remember the survey in
Wisconsin regarding the inspecting of fairly old solar thermal systems.
All the participants really seemed to love their systems, but I think over 3/4
of them were not working. </span><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>On 7/1/2018 8:02 PM, Jerry Shafer wrote:<o:p></o:p></p>
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<p class=MsoNormal>Kirt, Chris, Wrenches<o:p></o:p></p>
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<p class=MsoNormal>We have not had any issues other then one or two in Hawaii
or California, it might be the location, concrete blocks sitting in the weather
all exposed to rain from on all sides and then potential freezing conditions
will cause failure of the blocks, the same issue pools will get if there are
tiles around the edge when they pop off in freezing conditions but thats just
me><o:p></o:p></p>
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<p class=MsoNormal>Jerry<o:p></o:p></p>
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<p class=MsoNormal>NABCEP Installer and PVI<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>On Wed, Jun 27, 2018 at 10:20 AM, Kirk Herander <<a
href="mailto:vtsolar@icloud.com" target="_blank">vtsolar@icloud.com</a>> wrote:<o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:14.0pt'>All,</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:14.0pt'>I have a 6 year old ballasted roof system in which
about 50% of the solid cap blocks(16\u201dL x 8\u201dw x 4\u201dD) are cracked and crumbing,
some are close to rubble. I assume it was a bad batch, but has anyone seen this
before? What might be the preventive remedy in the future? A coating of some
sort?</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:14.0pt'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b>Kirk
Herander</b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b>Owner|Principal,
VT Solar, LLC </b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><i>Celebrating
our 27<sup>th</sup> Anniversary 1991-2018</i></b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><a
href="http://www.vermontsolarnow.com" target="_blank">www.vermontsolarnow.com</a></b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>dba
Vermont Solar Engineering<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>NABCEP<sup>TM
</sup>2003 Inaugural Certificant<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>VT
RE Incentive Program Partner<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>802.863.1202<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:14.0pt'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:14.0pt'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:14.0pt'> </span><o:p></o:p></p>
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<pre>_______________________________________________<o:p></o:p></pre><pre>List sponsored by Redwood Alliance<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>List Address: <a
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<p class=MsoNormal>-- <o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt'>
Christopher Warfel, PE<br>
ENTECH Engineering, Inc.<br>
PO Box 871, Block Island, RI 02807<br>
(401)466-8978</span><o:p></o:p></p>
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