I extended out on my house to make a large covered area over my patio. It has a roof with attic space, and is not enclosed with walls. I plan on installing several recessed lights, outlets and a fan. since it is not enclosed and heated will I be able to use regular 12/2 electrical wire, J-boxes, lights, fan, etc?
Partially as long as you don't expose the nm-b to the elements. Your device boxes will need to be weatherproof and you will need emt conduit sleeves as protection for your drops to receptacle boxes and switches.