Smoke Chamber & Firebox Repair



The smoke chamber and firebox are subject to extreme temperatures and direct flame contact. Direct flame contact from a wood fire can reach over 3000 degrees F. Without additional protection regular masonry red brick can thermally transfer the heat from a wood fire in the firebox to surrounding combustible building materials (ignition point as low as 190 degrees F.) Fire brick is designed to reduce thermal transmission of heat and it is the material of choice for firebox construction however the smoke chamber is not constructed with fire rated brick.What protection do you have in the smoke chamber during a chimney fire?
Despite building codes having very rigid requirements for fireplace and chimney construction most fireplaces and chimneys have serious construction deficiencies and inadequate thermal protection. The most common deficences we find are improperly sized mortar joints, mortar joints filled with standard mortar rather than high temp non-water soluble refractory or furnace cement, smoke chamber construction with hollow red masonry bick, no insulative parge material in the smoke chamber, and improper corbel design.
We inspect and evaluate the condition of every fireboxes and smoke chamber during our NFPA level 1 inspection service. If minor deficiencies are found we can typically repair these on site during the same day visit. If major deficiencies are found or drafting problems exist, we may suggest parging the smoke chamber or firebox with a insulating refractory cement product such as Chamber-Tech 2000 or Chamber Coat. Chamber Coat comes with a 20 year manufacturer warranty and is designed to withstand temperatures up to 2550 degrees F. An application of Chamber Coat to the smoke chamber can smooth jagged edges and exposed corbels while reshaping the smoke chambers for a stronger, more efficient draft and help reduce creosote buildup.

 

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