Fire place screens and insulation

[James Kerrigan]

Is there a type of insulation that can be used behind the frame of a fire place screen that fills gaps between the frame and an irregular wall?

[No]

Yes - Go to a fireplace screen dealer, not to home depot or lowes, and ask for it. Its not expensive and a good idea. Should have come with the door. It looks like yellow fiberglass (it is yellow fiberglass) and likely has some heat treatment properties to it. It may also have a sticky backing IIRC to attach it to inside of door. This is not to be confused with the gasket material used to seal doors to air tight inserts, that stuff looks like white rope.