2' overhang is nothing bad in-and-of-itself. Post and beam I would go with a panelized construction for roof so that you don't have to deal with venting, airspace, etc. This would eliminate any condensation or ice dams or thermal voids from structural members. Basically, your interior finish, solid insulation, exterior sheathing and roofing are all in direct contact with each other and on the outside of your rafters. No vapor can go through so no need for vent, etc. I would do my sidewalls this way too. Polyisocyanrate foam kicks the s&%+ out of haybale any day. Much better r-value, lighter, less work, faster construction, no settling, no rot no bugs, etc. etc. etc. It sounds like you know enough to properly season your self-cut timber. I don't know all the details but I know it is bad to use green timber. Sounds like a fun project.
Metal roof is expensive. What's wrong with regular fiberglass shingles? what will stick to a 12/12 pitch? and with r-30 panels you don't need to worry about dams - they just won't happen
Last edited by jbrooks544; 01-24-2004 at 06:41 PM..
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