Code conflicts with Building Science
I just spoke to my township about finishing my basement. I want to put 2" XPS on the cinder block walls, with the wood frame built a few inches away from the wall filled with unfaced insulation and then sheetrocked.
The township requires that I use FACED insulation as a vapor barrier. AND they require fireblocking with gypsum board (or fiber board, batts or glass fiber) at 10 feet intervals horizontally and vertically within the wall space. This seems to me a sure fire way of trapping the moisture and providing extra organic food for mold.
What recommendations do you have for mitigating the potential damage of these requirements? Should I use purple board for the fireblocking? Should I use it for the internal walls, too? Should I pay extra for the yellow board instead (the paperless kind)?
Should I hire a contractor who is experienced with using galvanized steel frames?
I should mention that I live in Central NJ and have a very high water table. The previous owner drylocked the walls and the floor, so there doesn't seem to be a lot of moisture coming through (though the drylock won't last forever, and I haven't done the plastic moisture test to confirm, yet). We have gotten flooded due to sump pump failure, but we plan to replace our current 2 pumps and include a back-up water powered sump pump. We also have a perimeter drain in the basement. We do use dehumidifiers.
I wasn't planning on getting mold-resistant drywall or look for steel framing, but with these code requirements, should I?
thanks in advance,