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(c). Outside the congested areas of the municipality, when a hazardous condition is not created thereby, the area of a public building, a business building or a storage building, not over two stories high, may be increased in excess of the areas fixed by this section, in the discretion of the governing body of the municipality; provided that a building of combustible occupancy, or involving con- siderable cOinbustible iliaterial in its structural parts, shall be sprinklered, and also curtain boards or draft stops shall be installed as required by the building official. 12 . ,~ I u, . (b). Outside the fire limits the area of one-story buildings of heavy timber construction, ordinary construction and wood frame construction may be increased 33 % per cent above the areas other- wise fixed in this section, when all wood structural members, in- cluding columns, wall and partition studs and sheathing, and floor and roof construction, are of approved fire retardant treated lumber as defined in section 7. (c). Bond. (1) In ashlar masonry, bond stones uniformly distributed shall be provided to the extent of not less than 10 per cent of the area and having not less than 4 inches of bond into the backing masonry. (2) Rubble stone masonry 24 inches or less in thickness shall have bond stones with a maximum spacing of 3 feet vertically and horizontally, and if the masonry is of greater thickness than 24 inches shall have one bond stone for each 6 square feet of wall surface on both sides and no header stone shall be less than 12 inches long measured at right angles to the face of the masonry. (d). Natural Beds. All stones showing pronounced cleavage shaH be iaid on their natural bed, except for cornices and otht:r pru- jecting members which shall have the grain or bedding planes verti- cal and at right angles to the face of the masonry. 25 (a). The limiting areas fixed in this section may be increased by 100 per cent when the building is sprinklered, and by 200 per cent when the building is sprinklered and does not exceed one story nor an average of 25 feet in height to the roof, or to a fire retardant ceiling through which there shall be no openings except openings into shafts or ducts, the enclosing walls of which are of construc~ion equivalent to the ceiling. (2) Rubble stone walls shall be 4 inches thicker than is re- quired for solid masonry walls in subsection 3 of this section, but shall not be less than 16 inches thick, and shall not exceed 40 feet in height. (b). Lateral support. Stone walls shall conform to quirements for lateral support of other solid masonry walls section 3 of this section. the re- in sub- 4. (a). Thickness. (1) The minimum not less than that of this section thickness of walls of stone ashlar shall be required for solid m.asonry walls in subsection 3 . 4. 3. Alteration. No building shall to exceed in area in any story the limits Area modification. be hereafter altered fixed in this section . so as 2. Street. Under this section a street shall be deemed to in- clude any avenue, boulevard, street, alley or lane, 20 feet or greater in width, or any court, parking space or yard, with direct connection to a street, and not less than 20 feet wide. Such court, parking space or yard shall be the property of the owner of the building- and shall not be enclosed or roofed over. (e). For unprotected metal construction the area of one-story buildings is not restricted; buildings exceeding one story shall not e.."{ceed the area limits specified for noncombustible construction. (c). For ordinary construction, and for noncombustible con- struction, the area of one-story buildings shall not exceed 6,000 square feet if fronting on one street, 7,500 square feet if fronting on 2 streets, 9,000 square feet if fronting on 3 streets and 10,500 square feet if fronting on 4 streets; provided that outside the fire limits the area of one-story buildings of noncombustible construc- tion shall not be restricted. The permitted areas for buildings ex- ceeding one story shall not exceed 5,000, 6,000, 7,500, and 9,000 square feet, when fronting on one, 2, 3 and 4 streets, respectively. (d). For wood frame construction the area of buildings shall not exceed 5,000 square feet. (e). Other Requirements. (1) Under-burned clay bricks shall not be used in any part of a building or structure where exposed to the weather, nor in isolated piers, nor in such part of a bearing wall above which the wall extends more than 40 feet. (2) Clay or shale brick laid in Type A or Type B mortar shall be wet immediately before being laid, except that very hard or vitrified brick need not be wetted. (3) Horizontal and vertical joints in brick masonry shall be filled with mortar. (4) Except in dwellings interior bearing walls that are less than 12 inches in thickness and support wooden floor or roof joists, shall be corbeled not less than 3 inches to receive such joists, unless ap- proved metal joist hangers are used. Stone Walls. . . square feet if fronting on I streets, fronting on three or more streets. nor 10,000 square feet if e e (d). Bond. The facing and ~ing of solid masonry bearing walls shall be bonded so that not less than 4 per cent of the wall sur- face is composed of full length headers. The distance between adja- cent full length headers shall not exceed 24 inches either vertically or horizontally. In solid brick walls more than 12 inches thick the inner joints of header courses shall be covered with another header course which shall break joints with the course below. The facing and backing of solid masonry non-bearing walls shall be bonded as required above for bearing walls or shall be bonded with corrosion- resistant metal ties spaced not farther apart than 16 inches vertically and 24 inches horizontally.