Let me start be saying that I'm talking about mechanically attached tilt-mount solutions capable of handling 172 mph design wind speed, ASCE 7-10. Ballasted systems need not apply.
We've used a variety of hardware for TPO membrane flat roofs, which is becoming more and more popular around here. We've found that hardware bases that mount on top of the membrane work well when there is a single slope in the array area and the rails can follow the contours of the roof surface. Ecofasten base plates spread the load out enough onto a DeskDeck roof board or similar, and have proven to be pretty versatile. However, when you have center drains or other situations with multiple slopes, it is advantageous to attach to the roof deck directly, typically plywood here, particularly in new construction. Tapered insulation, decking, and membrane can be cut around stand-offs and flashed nicely with 8" TPO boots. This keeps rails parallel to the trusses/ground, and disregards the roof membrane slope. The problem with this is that insulation can easily get to be 6" thick, even on a small residential flat roof, requiring a minimum 14" long stand-off to fit a standard TPO boot above the membrane. Long story short, what mounting systems are others using for this scenario, and who offers long stand-offs? J ason Szumlanski Fafco Solar
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