I could not find any rackless system that still gave air flow for my AG panels. The S-5 for my panels does not anchor the solar into the timbers and requires more roof penetrations. Once you have the racks mounted to solar goes up so fast. The racks make your building stronger it is like cross hatch support over cross hatch support I think that is how the engineer I talked to described it.
He showed me picture of a hurricane took to roof off on house and not the one with their racks and solar installed because of the strength it added.
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