Wrenches, We install PV & SHW on a lot of flat-pan metal roofs here in the Great Northwest. Most of these roofing seams are not amenable to S-5! clips and if they are we can¹t trust how the roof is held down.
We want to install the supports to best roofing practices. The roofers that we¹ve worked with use rubber boots that fit over vents and holes, which seal to the roof with goop and are attached by screwing through the ring at the base of the boot, through the roofing, into the roof sheathing. The flashing boot around the post requires 5 to 9 more screw holes, depending on the diameter and doesn¹t conform around the standing seams very well. Additionally, on roofs with no full sheathing deck like with skip sheathing, and horizontal perlins - the boot cannot attach to the roof very securely. Although this seems necessary for situations where there is an actual object going through the roof (e.g. conduit, pipe, and vents), I don¹t see how flashing this way will be better than simply using posts without the boot flashing, or even L-feet, direct to the roof, with an EPDM gasket, with one or two lag bolts predrilled into the roofing truss or perlin, and filled with goop till it squirts out. What do you do on metal roofs in these situations? Thanks, Kelly Keilwitz, P.E. Whidbey Sun & Wind, LLC Renewable Energy Systems NABCEP Certified PV Installer WA Electrical Administrator #KEILWKM923RB 987 Wanamaker Rd. Coupeville, WA, 98239 360.678.7131 [email protected] WA Electrical Contractor #WHIDBSW920MS WA General Contractor #WHIDBSW946M1
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