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I’m at my wits end on where to buy fire retardant rigid foam insulation in NYC. I need it to be fire retardant because I don’t want to put a layer of drywall over it (I need those precious inches). I’m actually putting a built-in bookshelf right over the top of it, which will not provide the same fire retardation as the drywall. I only need 5 sheets. I tried to special order via Home Depot & Lowes, with no luck.

Any body know of a source? Specifically I was interested in Thermax insulation (by Dow) but really, any fire retardant stuff will do.