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I am planning on building an entryway on a cabin. I am using 3 ply 2x6 glue lam for the posts. I am using 2x10's for the cross beam and rafters on top of the posts. It will be a 6/12 pitch roof in far northern Minnesota and I have two options for the ceiling/roof. I would like the ceiling to clear span 8 feet with a 2 foot overhang out of the front of the rafters.
Option 1 would be to use 10 foot 2x8 tongue and groove yellow pine and build a 2x4 rafter system above it and screw it from the top of the rafter to the 2x8's below, sheet it with osb with a steel roof.
Option 2, use heat treated 2x10’s laid on their side, after the first layer I plan to offset the next layer by 1 ½ inches and glue and screw it from the top, the third layer would be flush with the first layer essentially creating a 4 ½ inch tongue and groove, covered with steel. Is either of these options viable?
Thanks Troy. I apologize for not responding to your previous post. I think that both of your options are viable from a metal roofing security standpoint. However, I really am not qualified to addressed the structural integrity or whether it meets your local codes, though both methods sound pretty beefy to me. Most metal roofs have been tested when installed over any sort of solid deck along with underlayment. Typically the decking they are tested on is 5/8" plywood, so anything thicker or stronger than that will be fine as well. Metal is a very low weight roof compared to many products so that works in your favor. Because this is an entryway, am I to assume it's "open air" or is it over a conditioned spaced? One thing you need to think some about is condensation ... if over a conditioned space warm moist air from inside reaches the cool back surface of the metal, it will condense. I hope this helps. Feel free to email me direct at [email protected]
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