![]() Flue liners need to line up flush at the joints to form a smooth interior surface with no ledges or other obstructions where creosote and debris can accumulate. Please note, refractory mortar is required by code. Flue liners are installed by neatly embedding one on top of the other in non-water soluble refractory mortar using a 1/16 to 1/8 inch mortar joint. ![]() For appliances, the flue starts no less than 8 inches below where the appliance hooks into the flue. For fireplaces, the flue is constructed directly over the fireplace. The flue lining extends the entire length of the chimney. The Chimney wall must be a minimum of 4 inches of solid masonry completely surrounding the flue liner. Natural Stone (ASTM Test Method C 170 or C 99) A chimney consists of the flue and the chimney wall.Brick (ASTM Specification C 55 or C 216, Grade SW).Fire Brick (ASTM Classification C 27).Concrete Block (ASTM Specification C 90 or C 129).Refractory Mortar (ASTM Test Method C 24 (cone 10) and Test Method C 199 (Medium Duty)).Flue Liners (ASTM Specification C 315).Masonry Chimney Construction Materials used in masonry chimney construction include: Note: the chimney should not support any other parts of adjacent structures unless specifically designed to do so. Check with local code to determine minimum requirements for all footings and reinforcements. Masonry Chimney Construction Guidelines Masonry Chimney Foundation An adequate concrete footing is required and must be able to support the weight of the chimney and/or fireplace.
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