Friday, April 3, 2009
shortcut
A very long day of only contemplating the upcoming project. Having a bit of trouble locating a supplier of corrugated metal roofing for a curved roof. Need to settle that issue before I decide on the radius of the trusses I will be building from scratch. Did manage working another loaf of solar bread into the busy schedule today. Took a break from all that thinking to go for a drive - rationalized it would be a good idea to at least hunt down some perfect aggregate for the concrete footings. Not really looking forward to getting my dirt (I need about 8 cubic yards) but it has to be done so will concentrate tonight on trying to trick myself into thinking it will be a blast. Found that someone had recently graded a section of road that had washed out years ago. Now I have a shortcut to Terlingua Creek that I can drive my truck through. That shaves about 6 miles off the old route. Saw some longhorns in the high brush by the creek but didn't recognize any friends.
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Bending and Bowing
If a sheet must be bent, a gentle 90-degree bend is the maximum recommended. Metal should not be re-bent once it has been formed, nor should it be folded back on itself, since it is not designed to take a lockseam. When a metal roofing sheet must be installed on a curved roof, screws should be installed at every overlapping rib at the sheet ends to resist the natural tendency of the metal to spring back. Standard fastener spacing is permitted over the rest of the sheet. When installing the metal roofing over a curved arch, the minimum radius of the arch is 18' for aluminum profiles and 24' for steel profiles. Use sealant tape or butyl caulking at all sidelaps and endlaps.
Additional care and fasteners must be provided when securing the top and bottom purlins on a laminated rafter building to prevent the curved panels from pulling the purlins loose from the rafters. Ring-shank pole barn nails, heavy wood screws, lag screws, or bolts are often used for attaching these purlins.
I'm sure you've discovered the Houston company Berridge Manufacturing ... http://www.berridge.com/curvsdec.htm but wanted to share my google results with you just in case!
Your heart is set on a curved roof, not something like a gambrel roof? A rhetorical question ...
Glad you now have a shortcut to TC!
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