Commercial metal roof installations... [RE-wrenches]

[Jim Duncan]

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On a brighter note...
I bid on a PV installation on a metal roof of a building built by a 
commercial construction company. The companys owner assured me that he 
never uses "standing-seam" panels, only a ~4 ft. wide heavier gauge 
steel in 20 foot lengths. Its seams and ribs are about 1 inch wide and 
flat on top and are on about 16 in. centers. 
None of the S-5! mounting clamps appear to match the profile of these 
ridges. Besides the ridges and seams sides slant out at about a 45 
degree angle down to the surface of the roof.
The builder and I went over my needs for a flat stable surface to mount 
typical standoffs to. He explained that any time he needed a mounting 
surface on one of his roofs, he attaches a length of angle steel across 
the standing ridges and attaches it with "pop-rivets". He reinforces the 
mounting points to the interior frame of the building; though never 
detailed how. I assume he has access to the inside during construction 
and blind attachments aren't an issue.
On the surface, it makes sense and would reduce the number of 
penetrations and potential leaks. 
Enough sense that I am considering a similar design for a 10 kW system 
on another much larger roof with near identical ridges only on 1 foot 
centers. This roof is aluminum, and has insulation below the surface. 
That requires blind rivets.
some questions:
What type of heavy duty blind riveting or attaching systems are out 
there in use that could work thru 2, 16-22 gauge surfaces.
Has anyone used a similar method for mounting to metal roofs.
How to waterproof and isolate dis-similar metal surfaces.
Thanks 
Jim Duncan
North Texas Renewable Energy Inc
Fort Worth, Texas

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