I recommend the hydraulically pressed ballast block over the non hydraulically pressed kind.
From: cwarfel [mailto:cwar...@entech-engineering.com] Sent: Monday, July 2, 2018 1:08 PM To: re-wrenches@lists.re-wrenches.org Subject: Re: [RE-wrenches] crumbling ballast blocks 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. 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. On 7/1/2018 8:02 PM, Jerry Shafer wrote: Kirt, Chris, Wrenches 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> Jerry NABCEP Installer and PVI On Wed, Jun 27, 2018 at 10:20 AM, Kirk Herander <vtso...@icloud.com> wrote: All, I have a 6 year old ballasted roof system in which about 50% of the solid cap blocks(16”L x 8”w x 4”D) 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? Kirk Herander Owner|Principal, VT Solar, LLC Celebrating our 27th Anniversary 1991-2018 www.vermontsolarnow.com dba Vermont Solar Engineering NABCEPTM 2003 Inaugural Certificant VT RE Incentive Program Partner 802.863.1202 _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org -- Christopher Warfel, PE ENTECH Engineering, Inc. PO Box 871, Block Island, RI 02807 (401)466-8978 <http://entech-engineering.com> EEI logo
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