These were installed by fastening from the inside of the rim joist and also marked the location where the exposed rafters would be on the inside of the rim.
The doubled rafters were not the easiest to install. Once in place side by side they were spiked together with square cut nails. Nothing short of a threaded fastener will pull two pieces of wood together better than a square cut nail.
When all the rafters were in place it was time to attached the roof sheathing. This involved a layer of 3/4" AC plywood pre primed on the underside and then another layer of water proof luan. Building up this thickness would keep the roofing nails from penetrating through to the interior of the ceiling under the porch.
Roofing and flooring next time, and below a reminder about the HandWorks event coming up this spring in Amana, Iowa.