30 Aug '12, 4am

Green Building Q&A: Codes run afoul of advice when it comes to insulating my slab

A few months back, I asked about the best way to layer materials for my garage slab on grade with hydronic heating in MN (zone 6): http://www.greenbuildingadvisor.com/community/forum/green-building-techn... Consensus was to place 6 mil polyethylene vapor barrier ABOVE XPS insulation, directly beneath concrete slab. PEX tubing would then be stapled to XPS foam boards, and rebar on top of PEX. However, building inspector failed my installation, stating code requires 4" of rock for radon mitigation, followed by polyethylene sheeting, THEN foam boards, and finally the PEX and rebar for the pour. So, my question is this: should I care? I know what Joseph Lstiburek says... no sand between sheeting and concrete, and no poly beneath foam board. But, what is the risk, really? (I know what the risk is if I don't do it like the building inspector asks!!) Most builders here in MN rout...

Full article: http://www.greenbuildingadvisor.com/community/forum/build...

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