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greguw · 08-29-2011, 12:22 PM

Looks like its double from the jam up to about 6 inches then it goes to single layer ... you can get the all the wholes to weld them ... I welded all the screw holds on the ribs but then re-enforced all the mount points for the rack with 3/16 plates that are connected to the ribs .
If you look in the previous page there is a pick of the inside of the roof and you can see where the double ends .
I'm also going to apply more sealant to the rib roof area .

08-29-2011, 12:22 PM	#152
greguw Registered User Join Date: Jun 2010 Location: Bucks County , Pa Posts: 223	Re: 1990 GMC Suburban ... Cummins Powered Looks like its double from the jam up to about 6 inches then it goes to single layer ... you can get the all the wholes to weld them ... I welded all the screw holds on the ribs but then re-enforced all the mount points for the rack with 3/16 plates that are connected to the ribs . If you look in the previous page there is a pick of the inside of the roof and you can see where the double ends . I'm also going to apply more sealant to the rib roof area .