Insulation Around Metal Chimney

Fiberglass insulation is naturally fire resistant.

Insulation around metal chimney.

As listed where shown in the table above means that the acceptable fire clearance distances for those chimney types must match or comply with the manufacturer s instructions. How to insulate a metal flue pipe. Remove the insulation from its kit and lay it out upon the ground foil side down. Airflow through the 2 airspace or just 2 clearance to combustibles.

The flue is the metal tubing that extends up from the top of your gas furnace or water heater that carries the carbon monoxide gas from the heating unit to your. Those clearance spacings are normally found in at least two locations. This makes it an ideal insulation material for use in areas that experience high temperatures. Finally prepare for adding insulation foam or additional fiberglass batts by installing a second piece of vertical sheet metal that provides a 2 inch airspace around and parallel to the chimney.

And creating hot spots in the metal exterior shell if its airflow around the chimney wouldn t airsealing be a bad thing for the chimney in this case. Leaving more than around 1 11 2 inches in overlap can cause some difficulties when attempting to install the liner. Yes if the particular metal chimney system was not tested with an airtight firestop attic insulation shield. Notes to the metal chimney fire clearance table above.

It is often installed in gaps around the chimney and flue to prevent airflow that can siphon the heat away from the interior of the building.