If you are building aluminum ribs (or aluminum / carbon fiber strips), the top and the bottom “T Strips” have to be glued on with 2216 or similar epoxy after they are riveted in place.
2216 is a 3M epoxy which is specified for use with aluminum bonding. Surfaces must be scoured clean (eg,: 180 grit), then cleaned with acetone, before a liberal fillet of 2216 is added on all sides.
Tape was used to stabilize the strips while glue was applied and setting.
The tip and root rib get a square aluminum tube reinforcement.
We also recommend a 5″ vertical piece of angle on each rib, to prevent vertical crushing. (Not shown, will provide pic soon.)