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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