If you are talking about commercial flat roofs, we never use PVC - too much expansion potential.
All our rooftop conduit runs here in the Albany, NY area are RMC of the galvanized type, and of course, threaded. There are standard plumbing supports with rollers, as well as standard expansion fittings (be sure to match the fitting to the conduit - don't use EMT with RMC unless approved by the manufacturer). A great product we have recently begun using is a EPDM pipe support by the Rubber Triangle Company that is compatible with most rubber roofing, and allows a lot of movement. -Glenn From: [email protected] [mailto:[email protected]] On Behalf Of James Rudolph Sent: Thursday, December 22, 2011 9:39 AM To: RE-wrenches Subject: [RE-wrenches] Expansion on conduits on commercial roof tops! Howdy Wrenches, I was wondering how everybody is dealing with expanding conduits on roof tops? Do we have an accepted best practice on this?. What I am really looking for is a way to starp long conduit runs on commercial rooftops in direct sun that allow movement and expanision joints to do thier job. Mahalo in advance! James B Rudolph NABCEP Certified PV Installer
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