Exposed batt insulation
Batt insulation may not be exposed, either in exposed or concealed areas. Specifically, it is the vapor barrier that may not be exposed – it is flammable.
There are several types of batt insulation with a low flame spread foil facing that can be exposed. Here are a few:
http://www.guardianbp.com/litlib/FS25_fiberglass%20blanket.pdf
http://www.idimn.com/PDFs/insulation/fiberglass/flamespread-25/flameSpread25_sub.pdf
http://www.certainteed.com/resources/3025033.pdf
keynotes: insulation, fire, flame spread, flamespread25, batt insulation, vapor barrier, exposed insulation