Is there any danger in putting fiberglass above cellulose?
Chris writes again from State College, Pennsylvania: “This is a follow-up question to one answered by Pink Panther today – am adding R-30 unfaced OC fiberglass to current cellulose in between joists with R-17 value to achieve close to R-49. Home is heated with radiant electric ceiling heat – my safety concern is with cellulose over which fiberglass will lay. Is there any danger in trapping heat above cellulose AND so near heating element in ceiling (this would be applied in attic)?” Answer: I don’t have any information on how cellulose insulation will perform. Our typical recommendation is to use unfaced fiberglass insulation over any type of existing insulation. Fiberglas™ insulation is non-combustible.
