This summer I'm going to be building my house. It will be the first house I've ever owned, and I'm mighty proud. I've done a lot of finish carpentry and misc. building (barns, outbuildings) most of my life. But I'm not a Contractor.
I'm going to be building simple scissors trusses for this house. The upper chords will be 2X8 and the lower ones 2X6. The spans will be 12 feet, 19 feet and 17 feet. I've built trusses like this before, on my barn that spanned 23.5 feet. Those trusses were built and installed over 20 years ago. I used Southern Yellow Pine and am going to use the same wood for my house. My plan is to secure drywall to the lower 2X6 chords for the ceilings.
I'm thinking of installing baffles to the underside of the roof to provide air flow from the soffits to the ridge vent, and then insulating between the upper 2X8's with fiberglas batts. But I'm a little worried I won't be able to get thick enough batts in there to insulate well enough. So I'm thinking another option would be to also use batts between the lower 2X6 chord members. Or another option might be to go to 2X10's on the upper chord. Or another option might be to use nailers on the 2X8 upper chord to get thicker batts in there. But if I'm going to go to the trouble of installing nailers on those 2X8's, I might as well just go to 2X10's.
This is in the Ozarks of Southern Missouri, out in the country, where there are no building permits needed and no Guv'mint Inspectors to come nosing around. We like it that way. You can build anything you're man enough to build, as long as you're willing to accept the consequences. Therefore my plan is to overbuild a good, strong house. Your questions, advice and comments all needed. Thanks!