What R-Value do you need for a wall to be considered non-combustable?
What about fire proof?
Would 1/4" Wonderboard over 1/2" foil backed ceramic insulation (left over from insulating the chimney liner) meet the R-value requirement?
Thanks
What about fire proof?
Would 1/4" Wonderboard over 1/2" foil backed ceramic insulation (left over from insulating the chimney liner) meet the R-value requirement?
Thanks