Hot answers tagged framing
I would be concerned. Have the general contractor figure out who is out of specification and have them fix it. (My guess is that the concrete is to blame, but I'm not there with a measuring tape.) I strongly suggest that you don't let the house be built out of square. Among other things, it'll cost a bit more at just about every step.
If what you're saying is the tub will be on top of 2x10 at 16" on center spacing, with a span of 9 feet between bearing points that continue down to the foundation, you'll be fine. A drawing of the complex framing you seem to have would help out immensely. I still recommend doing the drawings and getting permits: I have a lot of experience framing houses, ...
The foam insulation itself is combustible, hence the requirement for a thermal barrier. According to the 2012 IRC: R316.4 Thermal barrier. Unless otherwise allowed in Section R316.5 or Section R316.6, foam plastic shall be separated from the interior of a building by an approved thermal barrier of minimum 1/2 inch (12.7 mm) gypsum wallboard or a ...
Sometimes concrete just doesn't cooperate. I'd say up to an inch out of play is the carpenter's job to deal with. Two and a half inches! is possibly a problem for lawyers... Had the distance been fudged to one and a quarter inches on both sides, (harrumph) maybe that'd be OK... I'd be interested in what the permissible 'fudge factor' for sill plates ...
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