
What type of insulation is that? Is that rigid foam?
Interior roof covering; I used 1/4" ply sealed all sides with varitane; fastened with short (be carefull) self tapping metal screws with wide heads. Wood needs to be sealed with something waterproof; stain would do too; you'll see condensation where the steel ribs are located; if you have enough height you could run firring strips opposite direction to the ribs. I used firring strips on the walls and would have but needed evey inch of height on the 6-2" roof thats now about 6'-1"; I hit my head in boots ...
fantastic fan is great; I have yet to install one but im north so its usually cool at night.
