Flammability of Foil-faced Insulation

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I have been using some foil-faced polyiso&#;whatever (the organic stuff) foam board as radiant heat shields and also on the outside of some dormers and knee walls in a bonus room. I checked the manufacturers web site just to see what info they had available, and they warned that it should not be left exposed, that it should be covered by brick, plywood, or drywall to avoid &#;flame spread&#; problems in case of a fire.

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While I am not subject to code inspections, this warning concerns me. Can any of you enlighten me on this? Rob, you&#;re a big proponent of foil-faced; has this ever come up??

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Hi,
We had an energy audit performed last week and they suggested that we spray foam our basement walls as that is causing heat loss.

I&#;m not sure that I want to go that route or even worry about it, however, I am wondering if this product would be 1) Better, 2) Safe around our Oil boiler (it&#;s a ground model, about 8-12&#; from the wall. Here&#;s the product: Johns Manville (Common: 2-in x 4-ft x 8-ft; Actual: 2-in x 4-ft x 8-ft) AP Foil R-13 Faced Polyisocyanurate Foam Board Insulation &#; https://www.lowes.com/pd/Johns-Manville-Common-2-in-x-4-ft-x-8-ft-Actual-2-in-x-4-ft-x-8-ft-AP-Foil-R-13-Faced-Polyisocyanurate-Foam-Board-Insulation/

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