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There is a center ledger, covered in painted drywall - next to the centered brick chimney(in the center of the house). There's a gap between the ledger and the chimney. Is "Great Stuff" safe to use to insulate this? Isn't there a "Great Stuff" of similar product that is fire retardant? The chimney doesn't get hot, but it can get warm when temperatures get extreme.

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    The Great Stuff made for fire retardation is more flammable than the regular Great stuff - which is pretty flammable itself - search youtube for this. I would use roxul.
    – DMoore
    Nov 10, 2016 at 15:26

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The clearance for combustible materials to a properly built masonry chimney like you describe would be 0"; no clearance required.

I would use just about anything you want and worry more about getting your chimney inspected and cleaned on a regular basis.

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