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10 4. Institutional buildine:s. For institutional building-s semi- fireproof construction shall not exceed 75 feet; ordinary construc- tion, heavy timber construction and noncombustible construction shaH not exceed 2 stories nor 35 feet; wood frame construction and . . 3. Public buildings. For public buildings semi fireproof con- struction shall not exceed 75 feet, except that public buildings which have an occupancy of less than 100 persons above the 75-foot level may be unlimited in height; heavy timber construction, 4 stories nor 5S feet; ordinary construction and non-combustible construction 3 stories nor 35 feet, except that churches of such construction may be 45 feet but not more than 2 stories, and that schools of such construction shall be not more than 2 stories high; and wood frame construction and unprotected metal construction shall not exceed 2 stories nor 35 feet. I~ 2. Alterations. No building shall hereafter be altered so as to exceed the limits of height fixed by this section ' 1. New buildings. Except as may be otherwise provided in subsection 8 of this section, no building hereafter erected shall exceed in height the limits fixed in this section. (b). Allowable stresses. vVhere bonded to the backing as pre- scribed below, the full cross section of both the facing and the back- ing may be considered in computing the stresses. (c). Thickness. Faced walls shall be not less in thickness than is required for masonry walls of either of the types forming the facing and the backing. . Where bonded to the backing as prescribed below, the facing may be considered a part of the wall thicknesso. (d). Bond. (1) Brick facing shall be bonded to the backing as prescribed for solid masonry walls in subsection 3 (d) of this section. (2) Ashlar facing of either natural or cast stone shall have at least 20 per cent of the superficial area extending- not less than 4 inches into the backing to form bond stones, which shall be uni- formly distributed throughout the wall. (3) vVhen walls of hollow masonry units are faced with hollow units, the facing units shall be bonded to the backing as required for waiis oi hoHow masonry units in subsection 5 (c) oi this section. 8. Attachment of stone facing. Every projecting stone, and, except when alternate courses are full bond courses, every stone not 27 SECTION 12. HEIGHT RESTRICTIONS. 7. Faced walls. (a). Material. Materials used for facing shall be not less than 2% inches thick, and in no case less in thickness than .1B the height of the unit. 7. Partitions in multifamily houses. In multifamily houses partitions separating apartments or apartments from hallways or apartments from other occupancies and partitions separating stores from hallways or other occupancies shall have a fire resistance rating of not less than one hour, with openings equipped with approved fire doors or with substantial metal or metal covered doors or solid wooden doors of the flush type of nominal thickness not less than l:J4-inch. . . . 4. Wall and ceiling finish: In public buildings and institu- tional buildings, and in all places of assembly and exit ways there- from, no combustible material shall be used as interior wall or ceil- ing finish which is of such a nature that flame will spread over its surface more rapidly than over one-inch (nominal) wood boards covered with ordinary paint or varnish. 5. Business and residence separation. In buildings of other than fireproof or semifireproof construction portions classified as of business occupancy shall be separated from portions classified as of residence occupancy by partitions having a fire resistance rating of not less than one hour and by fire re'tardant ceilings, unless the business portion is sprinklered. . 6. Separation of dwellings. Walls or partitions separating 2 or more dwellings of other than fireproof or semifireproof construc- tion shall consist of a form of construction having a fire resistance rating of not less than 1 hour. 3. Schools, colleges, assembly halls, dance halls, bowling alleys, and auditoriums, over one story in height, shall have floors of not less than one-hour fire resistance. . . e rated from such other occupancies by walls and floors of non- combustible construction having fire resistance ratings of not less than 3 hours. e e (d). Bearing. (1) In hollow walls or cavity walls suitable provision shall be made at each line of floor beams and wherever load concentrations occur, to insure proper bearing. (2) When cavity walls or hollow walls, in which the cells of hollow units are laid vertical, are decreased in thickness, the units in the top course of the thicker wall shall be filled solidly with mortar or masonry or the exposed openings in such top course shall be covered with slabs of hard burned tile or concrete at least one inch in thickness or the openings may be stopped in some other approved manner. (e). Drainage. In cavity walls the cavity shall be kept clear of mortar droppings during construction. Approved flas~ing shall be installed and adequate drainage provided to keep dampness away from the backing. - (2) In cavity walls the facingtd backing shall be securely tied together with suitable bonding ties of adequate strength. A 3/16-inch diameter steel rod or metal tie of equivalent stiffness coated with a noncorroding metal or other approved protective coat- ing shall be used for each 3 square feet of wall surface. Where hol- low masonry units are laid with the cells vertical, rectangular ties shall be used; in other walls the ends of ties shall be bent to 90 degree angles to provide hooks not less than 2 inches long. Ties shall be embedded in horizontal joints of facing and backing. Addi- tional bonding ties shall be provided at all openings, spaced not more than 3 feet apart around the perimeter and within 12 inches of the opening. Cavity walls of plain concrete shall be reinforced as provided for solid walls of plain concrete in subsection 9 of this section.