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:" ""', e t , t .~~ Ie -30- 3. SOLID MASONRY 1rfALIS I EXCEPT. STONE VfALLS. (A) Thickness of Bearing WaJ.ls. (I) Elccept as otherwise provided in paragr'aphs (2) to (6) below" the minimum thiclmess of solid masonry bearing walls other than fire waJ.ls and party walls shall be not less than 12 inches for the uppermost 35 feet of the:ir height" and shall be increased 4 inches for each successive 35 feet or fraction thereof measured downward from the top of the wall. (2) Where solid masonry bearing walls are stiffened at distances not gr'eater than 12 feet apart by cross walls, or by internaJ. or external offsets or returns at least 2 feet deep, or 12 feet vertically by reinforced concrete floors or roof, they may be 12 inches' thick for the uppermost 70 feet, measured downward from the top of the wall, and shaJl be increased 4 inches in thickness for each successive 70 feet or fraction thereof. (3) In residential buildings not more than 3 stories in height" solid masonry bearing walls may be 8 inches thick when not over 35 feet in height. W'alls in one-story dwellings and 0 ne-story private garages may be 6 inches thick when not over 9 feet in height, except that the height to the peak of a gable may be 15 feet~ (4) Outside solid masonry bearing walls of business buildings and storage buildings not more than one-story high, may be 8" thick for areas not in ex cess of 750 square feet. ' (5) Outside of the .fire limits solid masonry bearing balls, 8 inches thick, may be used for buildings not exceeding 30 feet nor 2 stories in height, the waJ.ls of 'Which, under this ordinance, could be of wood frame construction; provided they do not exceed 50 feet in length between cross walls, piers, or buttresses. ~ (6) Solid masonry bearing walls above roof levell 12 feet or less in height, enclosing penthouses or roof structures may be 8 inches thick and may be considered as neither increasing the height nor requiring any increase in the thickness of the wall below, provided the requirements for allowable stresses are met. Cb). Thiclmess of Nan-bearing Exterior walls. The thickness of non- bearing exterior walls, except fire 'w'alls and party walls, shall be not less than 8 inches for the uppermost 15 feet, and shall increase 4 inches in thick- ness for each successive 35 feet or fraction thereof measured downward from the top of the wall.