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20" IJOIST
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JohnW
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.
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