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§ 1559.06 DWELLING HOUSE CODE 1559.06 Chimneys. (a) General. All chimneys shall be de- signed and constructed so as to be stable and structurally safe, and to conduct the gaseous products of combustion to the outer air with- out creating a fire hazard or a public nui- sance. (b) Support. Chimneys shall be wholly supported onmasonry orself-supporting fire- proof construction. ' (c) Corbeling. Chimneys maybe corbeled from solid masonry walls, but shall not be corbeled from hollow or cavity wall con- struction. Corbels shall not project more than 6 inches from the face of the wall, ex- cept that in the second story of two-story dwellings, corbeling of chimneys on the ex- terior of the enclosing walls may equal the wall thickness. Individual corbels shall not project more than 1/a the height or 1/s the embedment of the masonry unit. (d) Brick chimneys. Brick chimneys shall be built of solid brick not less than 33/4" thick and shall be lined throughout with fire- clay flue lining. (e) Concrete chimneys. Concrete chim- neys shall have walls not less than 33/4" thick of concrete reinforced both vertically and horizontally with not less than 02% of reinforcing steel and shall be lined through- out with fire-clay flue lining. (f) Concrete masonry units. Solid con- crete masonry units used in chimney con- struction shall be at least 33/4 inches thick and shall be lined throughout with fire-clay flue lining. (g) Concrete chimney blocks. Preformed concrete chimney blocks, enclosing one or more flues, shall conform to Grade B units of ASTM C 145 and shall be lined with fire- clay flue lining. (h) Sawed or dressed stone. Chimney walls built of sawed or dressed stone courses shall be'not less than 33/4 inches thick and properly bonded at corners and tied with metal anchors. Chimney walls of other stone shall be at least 8 inches thick. All stone chimneys shall be lined throughout with fire-clay flue lining. (i) rrojection through roof. Chimneys shall project at least 3 feet above the highest point where they pass through the roof and not less than 2 feet above any ridge or struc- ture within 15 feet of the chimney. Chim- neys shall be capped with noncombustible weather-resistive material. (j) Change in size or shape.. No change in size or shape of a chimney shall be made 60 within six inches of the roof framing through which it passes. (k) Cleanouts. Cleanouts shall be pro- vided near the base of each flue and shall be equipped with noncombustible doors and frames arranged to remain tightly closed when not in use. (1) Lateral support. Chimneys erected outside of frame dwellings.shall be anchored to the stud walls at each floor level or at vertical intervals of not more than 10 feet. Chimneys, with height above roof exceeding 4 times their least horizontal dimension, shall be laterally supported at intervals not ex- ceeding 4 times their least horizontal dimen- sion. 1559.07 Flue linings. (a) Size. The size of fire-clay flue linings shall be ,not less than those established by ASA, A62,4. (b) Location. Flue linings shall start from a point not less than 8 inches below the smokepipe intake and not more than 2 feet above the base of the flue, or, in the case of fireplaces, from the throat of the fireplace, They shall extend, as nearly vertical as pos- sible, for the entire height of the chimney and be extended above the top or cap of the chimney. (c) Installation. Flue linings shall be in- stalled ahead of the construction of the chim- ney as it is carried up and shall be carefully bedded one on the other in portland cement mortar, cement-lime mortar or fire-cl'ay mor- tar with close-fitting joints left smooth on the inside. (d) Two or more flue. linings in same chimney. Where two flue linings are con- tained in the .same chimney and are not separated by at least 4" of masonry, the joints of adjacent flue linings shall be stag- gered at least 7 inches. When more than two flues are contained in the same chimney, at least every third flue shall be separated by masonry at least 4" thick, bonded into the masonry walls of the chimney. (e) Joints at angles. Flues shall be built as nearly vertical as possible but in no case at an ang1P greater than 45° fro,ri the ver- tical. Where flues change direction; the abutting linings at the angle joint shall be cut to fit closely and at no point shall the cross-sectional area of the flue be reduced. (f) Space between linings and walls. The space between the flue lining and masonry walls of a chimney enclosing such lining shall be filled with the minimum; amount of mortar necessary to keep the lining in place. n e s • 65 looo soo 800 700 soo m 500 ~. = 400 w 300 a H m 200 LL 0 N o. z a loo 0 90~ F 80 70 z - so ~ 50~ a Z 40' w J m 30 a 3 0 ~- 20- a lo. 8° ba ~t 04 5o A ~E~ 20 e° 15 ~~ b° I ~ a ~o rya ~~ ~o ly I I w w a~ M~ z w w N "I 'I gl z~ gl IO 20 30 40 50 60 70 80 90 INSIDE AREA OF. VENT IN S0. IN. REQUIRED AREAS OF GAS 100 I10 VENTS -looo - 900 - B00 - 700 -soo - 500 120