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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, ...


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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 ...



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