Posted 4/29/2019 01:25 (#7464667 - in reply to #7464177) Subject: RE: 20" IJOIST
NW Washington
You need to know the recommended roof snow load snow load for your area. Your I joist spacing is going determine purlin size too. Sounds like you need to talk to someone who knows roof design. The I joist seller might have some answers.
20" IJOIST
