29 Jan '12, 6am

rigid foam ceiling question #green

i'm building an icf home in WV. i have my roof trusses on 24" centers, 2x4 bottom chords, and 9'7" from the floor to the bottom of the truss. i would like to use rigid foam board for insulation and i'm wondering if it would be possible to use long screws with washers (wind lock) to screw through 6-8" of foam into the truss? cover it with an acrylic stucco and fiberglass mesh system. if that isn't a dumb idea my follow up questions would be, whats the best way to deal with the butt joints? can i leave space between the sheets and then fill with spray foam? just seems easier than taping. what about truss movement? can't i use the same techniques as i would with drywall? should i use a metal lath instead of fiberglass? is there just a better way to go about this?

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