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construction Sh.~ot e e exceed one story nor 35 5. Residence buildings. For residence buildings, heavy timber construction shall not exceed 75 feet; ordinary construction and non- combustible construction shall not exceed 3 stories nor 45 feet; provided that when the floors immediately over basements are of noncombustible construction having a fire resistance rating of not less than 2 hours, ordinary construction may exceed these heights but shall not exceed 4 stories nor 55 feet; and when in addition; in multifamily houses which are subdivided by fire partitions into floor areas not exceeding 3,500 square feet, all other floors have a fire re- sistance rating of not less than one hour, ordinary construction may be, but shall 'not exceed, 5 stories nor 65 feet. Wood frame con- struction and unprotected metal construction shall not exceed 2 stories nor 35 feet; except that dwellings other than prefabricated dwellings shall not exceed 3 stories. 6. Business buildings. For business buildings semifireproof construction and heavy tiinber' construction shal1 not exceed 75 feet except that for office build.ings semifireproof construction shall be unlimited; ordinary construction and noncombustible construc- tion shall not exceed 4 stories nor 50 feet; and wood frame construc- tion and unprotected metal construction shall not exceed 2 stories nor 35 feet. 7. Storage buil,dings. For storage buildings semifireproof construction shall not exceed 50 feet; ordinary construction, heavy timber construction and noncombustible construction shall not ex- ceed 35 feet; provided that in buildings which are sprinklered, semi- fireproof and heavy timber construction shall not exceed 75 feet and ordinary construction and noncombustible construction shall not exceed 50 feet; and wood frame construction and unprotected metal construction shall not exceed one story nor 35 feet. . . 5. (a). Thickness and height. (1) The minimum thickness of walls of hollow masonry units shall be not less than that required for solid masonry walls in sub- section 3 of this section. (2) Walls of hollow masonry units shall not exceed 50 feet in height. . (b). Lateral support. Walls of hollow masonry units shall be supported at right angles to the wall face at intervals not ex- ceeding 18 times the nominal wal1 thickness. Such lateral support shal1 conform to subsection 10 of this section. (c). Bond. (1) Hollow masQnry units shall have full mortar coverage of the face shells in both the horizontal and vertical joints. (2) Where two or more hollow units are used to make up the thickness of a wal1, the inner and outer courses shall be bonded at vertical intervals, not exceeding 3 feet, by lapping at least 4 inches over the unit below or by lapping with units at least 50 per cent greater in thickness than the unit below at vertical intervals not exceeding 17 inches. (3) Brick facing or lining (wl{ich does not include veneering) when used in hollow block walls shall be bonded to the backing in accordance with paragraph (~) of subsection 3 of this section. (4) Where walls of hollow masonry units are decreased in thickness, a course of solid masonry shall be interposed between the wall below and the thinner wal1 above, or the hollow units in the top course of the thicker wall shall be filled solidly with mortar or masonry. (d). Bearing: In walls and piers of hollow masonry units, suitable provision shall be made for proper bearing at the ends of all beams and at points of load concentration. Walls of hollow mas. units. unprotected metal feet. .' , I ' \ . 8. Exceptions. (a). For the purpose of this section, the following appurte- nances shall not be deemed parts of buildings: Church spires, tanks and their supports, roof structures, chimneys, signs attached to the building, radio masts, water cooling towers for air condition- ing or other apparatus, and parapets that do not extend more than 4 feet above the roof surface at their point of contact. (b). Outside the fire limits, public buildings, business build- ings, or storage buildings may, in the discretion of the governing body of the municipality, be erected to greater heights than fixed by this section. AREA RESTRICTIONS. 1. New buildings. Except as otherwise provided in subsec- tion 4 of this section, the building area permitted without suitab,le subdivisions by fire walls shall be limited as follows: (a). For fireproof construction and semifireproof construction, unlimited. 13. SECTION ~ 1 ~,I ~ (b). For heavy timber construction, the area of buildings shall exceed 6,5~ square feet if fronting on one street, nor 8,000 11 not . . 6. (a). Height and thickness. (1) Cavity walls and hollow walls shall not exceed 35 feet in height. Cavity walls, exclusive of the cavity, and hollow walls shall be not less in thickness than required for solid masonry walls in subsection 3 of this section. (2) In cavity walls, neither the facing nor backing shall be less than 3% inches in nominal thickness and the cavity shall be not less than 2 inches nor more than 3 inches in width. (b). Lateral support. Cavity walls shall be supported at right angles to the wall face at intervals not exceeding 14 times, and hol- low walls at intervals not exceeding 18 times the nominal wall thickness. Such lateral support shal1 conform to subsection 10 of this section. B (c). ond. (1) In hollow walls the parts of same shall be connected by bonds of brick, stone or the material of the wall, placed not more than 24 inches apart in either direction; but the parts shall not be deemed to act together in the support of loads unless such bonds are of a size and design to fully develop the strength of either part. 26 Cavity walls and hollow walls.