Insulation Around Masonry Chimney

Air sealing a flat attic and upgrading the insulation with a blanket of blown cellulose is bread and butter work for weatherization contractor matt damon and his company penobscot home performance based in bucksport maine.

Insulation around masonry chimney.

The insulation of a fireplace is critical for the safety and comfort of your home but there are specific ways to do so even if it means not making the prettiest bonfire around. Properly built there is no need for insulation over the header. This makes it an ideal insulation material for use in areas that experience high temperatures. You would think that insulating the inside of the wall around the chimney vent is the way to do it.

2 or they trim right up to the masonry with combustible trim. As such it can be used to insulate a chimney. You can purchase expanding foam in a spray can with an attached nozzle for reaching into tight areas. Fiberglass insulation is naturally fire resistant.

Expanding insulating foam is a product that can be sprayed into small cracks and crevasses which then expands and stops drafts and leaks. Seal and insulate the outside wall where it abuts the chimney. If the stone or brick is entirely insulated outside it will become part of the interior conditioned space but if any of it is left exposed from the interior through to the exterior it will continue to conduct heat. The main reason we propose exterior insulation would be to create an envelope around the chimney to eliminate any thermal bridging.

You should pack insulation snugly against the outside box frame of the thimble but never place insulation into the area within the thimbles s cylinder. Among the many air leakage points damon and his crews commonly encounter in an older maine house is the open chase around the brick chimney. 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. Code change proposals s232 12 and s237 12 would make the builders legal by.

You cannot pack insulation in on or tightly around a masonry fireplace like that. This product is ideal for a poorly insulated chimney to wall connection where cold air is getting into the. Single wall stove pipe going from the stove to the chimney must have a minimum of 18 clearance to combustibles. 180 degree heat shields are available for single wall pipe to reduce.