<div dir="auto">Regular cement blocks absorb water, freeze thaw cycle destroys them.<div dir="auto"><br></div><div dir="auto">Paving blocks are made with silica fume, denser than cement,dont absorb water, don't suffer freeze thaw damage. They are designed for walkways and driveways.</div><div dir="auto">There are cement looking pavers , 12x12 x 2" ,also made with fume.</div><div dir="auto">Any block plant should be able to make balast blocks to the needed specs. Silica fume is a waste product of coal combustion </div><div dir="auto">..ie cheap, but effective. </div><div dir="auto">Ken schaal </div></div><div class="gmail_extra"><br><div class="gmail_quote">On Jun 30, 2018 6:29 PM, "cwarfel" <<a href="mailto:cwarfel@entech-engineering.com">cwarfel@entech-engineering.com</a>> wrote:<br type="attribution"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p><font face="Verdana">I am <font face="Verdana">pretty sure it is
the freeze<font face="Verdana">-tha<font face="Verdana">w <font face="Verdana">cycle that the blocks are exposed to. I
have inspected hundreds of sys<font face="Verdana">tem
in the Nor<font face="Verdana">theas<font face="Verdana">t and this is a recurring<font face="Verdana"><font face="Verdana"> problem. It
has to b<font face="Verdana">e part of the
maintenance protocols or there will be
insufficient we<font face="Verdana">i<font face="Verdana">ght to resist the<font face="Verdana"> wind uplift forces. C<font face="Verdana">hris</font></font></font></font></font></font></font></font></font></font></font></font></font></font></font><br>
</p><div class="elided-text">
<br>
<div class="m_-6891022373104447490moz-cite-prefix">On 6/30/2018 6:17 PM, Chris Schaefer
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Kirk,
<div><br>
</div>
<div>Had the same thing happen to me on a commercial ballasted
system installed back in 2004. Had to be moved around to allow
installation of a new roof system. Replaced all the ballast in
2017. I'm located in Western NY, thus the same weather you
see. The blocks were on a stainless steel pan of which the
array was attached to. I've plenty of ideas as to why they
broke down but no real evidence. I expect it to happen again.
Does make me wonder about the new ballast systems that still
call out for the blocks as ballast. Perhaps poly sand bags?</div>
<div><br>
</div>
<div>Christopher</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Jun 27, 2018 at 4:20 PM, Kirk
Herander <span dir="ltr"><<a href="mailto:vtsolar@icloud.com" target="_blank">vtsolar@icloud.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div link="blue" vlink="purple" lang="EN-US">
<div class="m_-6891022373104447490m_-3312019715009331861WordSection1">
<p class="MsoNormal"><span style="font-size:14.0pt">All,</span></p>
<p class="MsoNormal"><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></p>
<p class="MsoNormal"><span style="font-size:14.0pt"> </span></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt">Kirk
Herander</span></b></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt">Owner|Principal,
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<p class="MsoNormal"><span style="font-size:12.0pt">dba
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</sup>2003 Inaugural Certificant</span></p>
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