1961-Annual Town Report - Laserfiche WebLink

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97 six inches thick, and a three inch profection on either side of the wall. (b) Under foundations of one and a half and not more than two story buildings, eight inches thick, and four inch projections on either side of the wall. (c) Under a twelve inch thick wall, eight inches thick. (e) All chimneys must extend to solid ground and have footings which project at least six inches on all sides and are at least eight inches thick. (f) All footings shall be of such width and thickness as to safely resist the superimposed load without exceeding at any point the allowable bearing capacity of the soil. Para. 5. Foundations. 1. All foundations shall be of such width and thickness as to safely resist the superimposed load without exceeding the allowable working strength, and can be of concrete, brick or stone. Minimum requirements shall be as follows: (a) Six inch thickness for poured concrete supporting one story wood frame structure without basement. (b) Eight inch thickness for all other poured walls. (c) Eight inch thickness for all masonry unit walls that extend up to eight feet below finished grade. Maximum total height of foundation wall sup- ported to be not more than thirty feet to eaves and thirty-five feet to ridge. (d) Twelve inch thickness for all masonry unit walls that extend more than eight feet below outside finish grade. One story frame buildings may be built on cement piers provided that the distance between piers is within the limits of the maximum spans for wood girders. Para. 6. Piers for Girders. 1. First floor girders must rest on solid masonry or cement filled steel columns. 2. On block foundations, cells of blocks below girder must be filled with cement to form solid bear- ing, or 3. Masonry pilasters not less than four inches by eight inches shall be built to receive girder ends, or cement filled steel columns may be used. Para. 7. All areas under buildings must be accessible with a mini- mum clearance of 20 inches and be ventilated in two exterior walls. Para. 8. No wooden structural member shall be closer than one inch to the chimney, and whenever wooden forms or supports are used in the construction of chimneys or fireplaces, they shall be removed within two weeks after masonry is laid. Para. 9. Sizing and spacing of girders shall be in accordance with Tables I, II, III, and IV appended. Para. 10. Wood floor joists. 1. Where joists frame into side of wood girders, metal hangers or a bearing strip spiked to the girder must be used. 2. Floor joists framed into masonry walls shall have at least a four inch bearing and a three inch fire or bevel cut. 3. Floor joists shall be doubled under all partitions running parallel to the floor joists. 4. All headers over four feet long shall be doubled. 5. Floor joists shall be cross bridged when span exceeds eight feet. At least one by three inch or stronger stock shall be used. Para. 11. Wood Rafters. 1. Truss construction may be used provided it is of a strength comparable with Table IV and is approved by the Building Inspector. 2. Collar ties not less than 2x4 or 1x6 inches shall be used for all sloping rafters. Para. 12. Exterior wall studs. 1. Studs shall not be less than two inches by four inches placed not more than sixteen inches on center. 2. Headers over all openings shall be doubled and shall be at least the following: (a) up to 3'-2 2x4's (b) 3' to 51/2'-2 2x6's on edge. (c) 51/2' to T-2 2x8's on edge. (d) over T-2 2x10's on edge. 3. In lieu of headers, approved trusses may be used. 4. Studs in exterior frame walls may run from sill to roof line provided they do not exceed twenty feet in length.