Originally Posted by rodeo
why do you want to sprayfoam the rafter bays?
is your new roof vented?
sprayfoam is considered "the best", I suppose,
but its not all roses and is best used in spot applications or
difficult situations. Sealing rim joists is one example.
not the rafters-the underneath of decking. i just used that pic as a reference. the reason is because i have a flat roof, so there is not a lot of space between decking and attic floor. so i cant use fiberglass because i can only get like R12 or something.
the roof is not vented-which is also why we are going with foam-otherwise we would need intake and ridge vents,etc.
i do need to seal rim joists too!