Insulation Around Masonry Chimney

180 degree heat shields are available for single wall pipe to reduce.

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. You would think that insulating the inside of the wall around the chimney vent is the way to do it. Fiberglass insulation is naturally fire resistant. 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.

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. Seal and insulate the outside wall where it abuts the chimney. Single wall stove pipe going from the stove to the chimney must have a minimum of 18 clearance to combustibles. As such it can be used to insulate a chimney.

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. 1 allowing the air space to be filled with non combustible insulation and or 2 allowing the masonry chimney to be in contact with combustibles if the chimney walls are at least 8 thick. 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. 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 are allowed to have sheathing touch the chimney but not framing and you cannot pack the space with insulation. 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.

And hear me out. 2 or they trim right up to the masonry with combustible trim. Expanding insulating foam is a product that can be sprayed into small cracks and crevasses which then expands and stops drafts and leaks. You can purchase expanding foam in a spray can with an attached nozzle for reaching into tight areas.