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it <br /> diagonal or spiral grain; and shall be at least equal in quality <br /> to the following commercial grades: studs, posts, planks, <br /> beams, joists and rafters, No. 2 Common; and girders and <br /> timbers No. 1 Common. All lumber sizes herein specified are <br /> nominal sizes. <br /> Para. 3. Excavation. 1. All excavations shall extend to <br /> solid ground. 2. All excavations shall extend at least 181, <br /> below the finished grade. <br /> Para. 4. Footings. 1. All footings when footings are <br /> necessary, must be masonry. 2. Minimum footings shall be <br /> as follows: (a) Under foundations of one story buildings, <br /> six inches thick, and a three inch projection on either side <br /> of the wall. (b) Under foundations of one and a half and <br /> not more than two story buildings, eight inches thick, and <br /> four inch projection on either side of the wall. (c) Under a <br /> twelve inch thick wall, eight inches thick. (e) All chimneys, <br /> °! must extend to solid ground and have footings which pro- <br /> Ject at least six inches on all sides and are at least eight <br /> inches thick. (f) All footings shall be of such width and_ <br /> thickness as to safely resist the superimposed load without <br /> 1 ` exceeding at any point the allowable bearing capacity of the <br /> soil. <br /> Para. 5. Foundations. 1. All foundations shall be of <br /> t such width and thickness as to safely resist the superimposed <br /> r load without exceeding the allowable working strength, and <br /> { can be of concrete, brick or stone. Minimum requirements <br /> shall be as follows: (a) Six inch thickness for poured con- <br /> 4 Crete supporting one story wood frame structure without <br /> € basement. (b) Eight inch thickness for all other <br /> r" walls. poured <br /> (c) Eight inch thickness for all masonry unit walls <br /> that extend up to eight feet below finished grade. Maximum <br /> he' <br /> total'I height <br /> g t of foundation wall supported to be not more <br /> than thirty feet to eaves and thirty-five feet to ridge. (d) <br /> Twelve inch thickness for all masonry unit walls that extend <br /> more than eight feet below outside finish grade. <br /> One story frame buildings, not intended for human habi- <br /> tation, may be built on cement piers provided that the dis- <br /> tance between piers is within the limits of the maximum <br /> spans for wood girders. <br />�t <br />`rl <br />'`il 2 <br />