I have done several ballasted installations of PV and thermal on flat roofs, all in snow country all had a decent parapet [30" around], all the roofs were over-built for the snow load, and I had all of the owners sign a waiver for me putting that much weight on their roof and they did not want to pay for engineering and felt confident in their roof and all are several years down the road and doing well.
Installation was either spray foam roof or, built up roof or membrane style roof, pressure treated ply wood to protect the roof, rack, weight [884 solid CMU's], then SHW Collectors or Modules. Typically we were near the north wall / parapet and anchored the conduit or insulated pipe to the parapet wall. We had an aluminum base built that accepts the 8 x 8 x 4" solid concrete block[s] firmly and has a riser to meet and bolt to the standard rack. Thanks - Dana Orzel Great Solar Works, Inc www.solarwork.com E - [EMAIL PROTECTED] V - 970.626.5253 F - 970.626.4140 C - 970.209.4076 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Nicholas Ponzio Sent: Monday, November 03, 2008 7:00 AM To: RE-wrenches Subject: [RE-wrenches] Ballast Racks with Thermal Collectors Wrenches, Has anyone used a ballasted roof rack system for mounting flat-plate solar thermal collectors on a flat roof? What are the issues involved? Thanks, -Nik _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
