Allan not a specific solution to your design issue but something to consider. I needed 6 pieces of aluminum to cover the narrow gaps between 2 PV modules on a skylight array installation. I stopped at a mfgr of custom skylights and windows and asked to search their cutoff/scrap bin. I found exactly the "T" configuration of aluminum extrusion I needed and paid the owner wholesale, plus he cut 'em to length free. They had dozens of styles and shapes though many were short pieces, I found just the thing. the end Jim Duncan North Texas Renewable Energy Inc 817.917.0527 nt...@earthlink.net www.ntrei.com
-------------------------------------------------------------------------------- ----- Original Message ----- From: Allan Sindelar To: re-wrenches@lists.re-wrenches.org Sent: Friday, March 27, 2009 1:01 AM Subject: [RE-wrenches] Hardware request Wrenches, We have an unusual roof application. It's for a roof-mount array on a commuter rail station canopy in Santa Fe. The roof is made up of a coated corrugated steel top layer, in the shape of a series of sine waves, over roofing felt, 5/8" plywood sheathing, and a corrugated metal base called Epicore. The array will be one long single row of modules in portrait mode on Solarmount rails. I'm leaving out some details in order to get to the point. We intend to base our mounting of the rails on a through-bolt mounting attachment, using threaded rod with the necessary nuts, washers, and sealant layers to create a compressed sandwich approach. The corrugated top layer has peaks and troughs of about 1½" radius. We'll use L-feet to mount the module rails to the through-bolts, which will likely be made from 5/16" or 3/8" threaded rod (size to be determined as we work out the details at the site). We will drill through the troughs of the corrugations, rather than the peaks, to avoid compressing the corrugated roofing; drilling the troughs has the project engineer's approval. What we need is something like half-round anodized aluminum or powder-coated steel stock material. The idea is that the convex round profile fills the corrugated trough, and the flat surface forms a base for the L-foot. We would expect to cut the stock to lengths, say 4-6", drill one hole through the center cross-section for our through-bolt, and mount the sections in the troughs, one at each through-bolt location. What product, likely used in some other industry or manufacturing process, would work for our half-round stock? The job isn't big enough to justify a custom extrusion - we probably need two dozen of the finished pieces. Thank you for any ideas, Allan Sindelar, Positive Energy ------------------------------------------------------------------------------ _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org 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
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