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235 and. 1\42.4-19.50), is hereby admped as part of jhis code and the requirements ~. stated therein shall be considered as the minimum requirements fl7r gypsum plastering, lathing and furring. 6-68 The publication entitled "Standard Specifications for Portland Cement Stucco and Portland Cement Plastering including requirements for Lath- ing and Furring" (A.S.A. designation 1\42.2-1946 and 1\42.3-1946) is hereby adopted as part of this code and the requirements stated therein shall be considered as the minimwm requirements for Port- land Cement stuccoing, Portland Cement plastering, Lathing and furring. 6-69 Plaster on wire or metal lath shall be three (3) coat work consis- ting of a scratch coat, a brown or second coat, and a finished coat. The finished coat may be omitted when the surface is covered with ~~et metal, wood wainscot, acoustical material, etc. The scratch coat must be thoroughly set before the broUi.rJl coat is applied. 6-70 Stucco shall be held above ground surfaces and flashing carried over openings, to pre.ent moisture from penetrating behind the stucCOj 6-71 Stucco shall consist of Portland Cement mortar or othe~ approved mortar, an approved metal lath, concrete masonry, brick work or other approved backine. 6-72 Nothing in this code relative to stucco or plaster shall preclude the use of other materials and constructions meeting the same or equivalent fire resistance rating. 6-73 The total glass area of rtqui:red windows in any habitable room shall not be less than ten (10) per cent of the floor area of the room. 6-74 One-haldr (~) of the area of windows opening upon an open porch may be used in computing the rqquired glass in the room in which they occur. 6-75 The total area of the ventilated portions of the required windows in any habitable room shall not be less than four (4) percent of the floor area of the room, except where a mechanical air change is provided. 6-76 A minimum height of eight (8) feet shall be required for the first floor. A clear height of at least seven (7) feet six (6) inches over a minimum of seventy (70) per cent of the floor area shall be required for the ceilings on all floors other than the first floor. 6-77 \~ere two (2) inch by six (6) inch material is used for fafters, they may be spaced twenty-four (24) inches on cente~. Collar beams shall be provided on forty-eight (48) inch centers. 6-78 6-79 Roofs of buildings Vlhich are more than thirty-five (3.5) feet in height or thirty-five humdred (3.500) square feet in area, shall be covered with hard incombustible materials of standard quality, such foofing, howeYer, shall rank not lower than Underwriter I s Labratories Class "B" farm out buildings excepted. Roofs of all dwellings and all buildings not exceeding three (3) stories, or thirty-fi.ve. (5) feet in height or thirty-five hundred (500) square -,32- -