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Masonry fireplaces listed and labeled for use in contact with combustibles in accordance with UL 127 and installed in accordance with the manufacturer's instructions are permitted to have combustible material in contact with their exterior surfaces.

Solid masonry units or hollow masonry units grouted solid with not less than 4-inch nominal thickness.Įffective flue area (based on area of fireplace opening)ġ2' hooked around outer bar with 6' extension.

4 bars for each additional 40' or fraction of width or each additional flue.ġ/ 4' ties at 18' and two ties at each bend in vertical steel. 4 full-length bars for chimney up to 40' wide. Smoke chamber wall thickness Unlined wallsįour No. Reinforced to carry its own weight and all imposed loads.ġ0' solid brick or 8' where a firebrick lining is used. 12' fireplace opening ≥ 6 square foot.ġ6' fireplace opening < 6 square foot. TABLE R1001.1 SUMMARY OF REQUIREMENTS FOR MASONRY FIREPLACES AND CHIMNEYS ITEMĨ' fireplace opening < 6 square foot.

Masonry fireplaces shall be constructed in accordance with this section and the applicable provisions of Chapters 3 and 4.

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