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~z ~ 1 6-26 Except where a cement slab is used, every building hereafter erected shall have either a basement or an excavated space under the entire first floor at least three (3) feet in depth or such building shall be elevated above the ground so that there shall be a clear air space of at least two (2) feet between the top of the ground and the bottom of the .n66r joists. Such space shall in aU cases be enclosed but provided with ample ventilation and properly drained. 6-26A Mas Gnry 'walls exceeding forty (40) feet non-supported length are to be increased four (4) inches in thickness over the entire length or reinforced with buttresses spaced not less than twelve (12) feet on centers and projecting not less than four (4) inches f~ inside face qf wall. 6-27 In all cases, where basements are constructed in ground which contains water, suitable provisions shall be made to properly carry off the moisture from such soil. 6-28 At least two (2) foundation wall vents, having a total effective area of one (1) square foof for each fifteen (1$) lineal feet of exterior wall, shall be constructed in each basementless space. Vents shall be covered with 1/8 inch mesh non-corrodible screening. This vent- ing shall not be required when basementless space is open to a ven- tilated basement. 6-29 Basement or cellar floor slabs shall be not less than three (3) inches thick if finished monolithic concrete; otherwise three (3) inches of concrete base and one (1) inch of concrete topping shall be required. 6-30 Wood posts in basements shall bear upon a concrete base which shall extend not less than four (4) inches above the finished floor and shall ,rest on a footing. The top of such posts shall be securely fastened to a girder. 6-31 Beam filling shall be required. around all exterior openings in masonry, veneer walls and at all intersections of wood and masonry. 6-32 Basements shall be provided with means of light and ventilation. Win- dows used for this purpose shall bave a total area Qf not less than two (2) per cent of the floor area. 6-33 An access opening of not less than_sixteen (16) inches by twenty-four (24) inches shall be provided for each basementless space under wood or metal floor construction. 6-34 A garage not exceeding 7$0 square feet in area may be attached to or form a part of a residence building or a business building if separated from other occupancies by wall~, partitions and ceilings of Uaterials to restrict passage of gases, smoke and odor from the garage to other parts of the building. Materials and construction provided for this purpose shall be at least equivalent in fire resistance and gas tightness to one (1) inch tongue and groove wooden boards, on garage side of supporting studs, free of know holes, with gypsum wall boards not less than three-eights (3/8) :Lnch in thickness nailed through the wooden boards into the studs and ratters, using two two (2) inch nails, and with four (4) inch strips of gypsum wall board similarlynailed over all butting joints of the -28-