What's the length of the ridge? Use a ridge beam and lay conventional rafters against it. This removes any truss triangulation and frees you from the ceiling joist/rafter ties. You may need to temporarily laterally brace the beam to prevent any bowing until the roof is sheeted. You'd get great...
Slab temperatures below the dew point result in the slab (and anything else below the dew point) to condense water from the air. Vapor barrier really has no bearing on this.
You can keep the air moving over the slab, but that would only work when the temperatures are somewhat close. Best to...
Yes. Also, your 12' studs will need blocking to prevent them from bowing or twisting. They would look just like firestops but don't serve that purpose.
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If I was spanning 24' to hang 2x6 rafters on, I'd use lvl. Probably need 3 sistered together. These would rest on king studs in the wall. This may be a feasible way to do it, just run the $$$ to see if it makes sense.
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C'mon man! I like your *****. :}
Engineered lumber used according to the manufacturers span table often precludes the need for an engineered stamp. The design is already done and incorporated into the product literature. You need to understand where your inspector will be coming from and...
NONONONONO!!! At least I'd be hesitant to cut birdmouths.
Page 36 of the link I provided shows how to birdmouth the i-joist. I'd rather add a beveled section of 2x4 above the top plate to support the uncut rafter.
Look for a connector to do the job too.