I read a thread once where a rear toyhauler ramp cracked, and the owner documented the repair. Seems his Goldwing hit the ramp too hard and cracked it. There was an aluminum perimeter frame with the fiberglass exterior, 1 or so foam insulation and 1/4 inch luan plywood covered in grip tape. Nothing in the middle but the fiberglass,foam, plywood sandwich. I would expect that to be the same for your patio . His repair was to make a interior grid of aluminum tube, more foam and replacement top deck. If I can find the link I will post it for reference.
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Kevin -n- Lisa
17 Fuzion 325 / 15 Chevy 3500 HC DRW
06 HD Ultra Classic
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