Yeah I was just looking at Home Depot, one piece 16' long 5 1/2" wide was $36....wtf! so I would be looking at $800 in just the top wood (no framework) for a 10x16. This is the veranda composite from Home Depot. Trex is more expensive than that.

so I assume $1000 in just top wood. What do I need for supports/frame? Is that regular wood or is that composite stuff as well?