O-1954-476 - Laserfiche WebLink

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'''-.--'''a .' , , 'I~' I, ....'--'. . -28- . provided that when one-story buildings or wood frame construction" ordinary con- 13'truction, noncombustible construction or unprotected metal construction do not 13xceed 150 square feet in area, such foundation walls or other permanent supports shall not be required. SECTION 21. MASONRY. 1. COOSTRUCTION. (a) All maso~ shall be protected against freezing for at least 48 hotU's after teing placed. Unless adequate precautions against freezing are taken, no masonry shall be built when the temperature is belaY' 320 Fahrenheit on a rising temperature or below 400 on a falling temperature, at the point where the work is in progress. No frozen materials shall be built upon. (b) Ex: cept when' carried mdepeniient],y by' girders at each floor, no wall shall be built up more than 25 feet in height in advance or other walls of the building. (c) Masonry walls that meet or intersect shall be adequately bonded or anchored. Piers having less than 4 square feet of cross-sectional area when located at an intersection with a wall shall be bonded into and built as part of that wall. (d) Except for window-paneled backs and permissible chases and recesses, walls shall not vary in thiclmess between their lateral supports. TFJhen a change in thiclmess" due to minimum thickness requirements, occurs between floor levels, the greater thickness shall be carried up to the higher floor level. (e) Isolated piers or posts on the interior of buildings shall not be built of stone. The unsupported height or piers shall not exceed 10 times their least dimension. Hollow masonry units shall not be usedf or isolated piers to support beams and girders unless solidly filled with concrete or Type A mortar in which case the allowable load mEW' be increased 25 per cent. (f) Door and 1I'rindovT openings in walls shall be spanned by well buttressed arches, or by lintels having bearings proportioned to their loads but not I ess than 4 inches. (g) No masonry" ~xcept for interior partitions" shall be supported on wooden girders or other form of wood construction. (h) 111 0 timber, other than nailing blocks not exceeding 2 by 4 by 8 inches in size, shall be placed in masonry '\-'Talls; except that in buildings of ordinary construction, timber lintels may be placed over openings, on the inside of t he wall, resting at each end not more than two inches on the wall, and cham- fered or cut to serve as centres for masonry arches; and with the ftU'ther exception