8.4 DESIGN OF FINISH STAIRS
{"Image DocumentName": "8.4 DESIGN OF FINISH STAIRS", "Image ImageDescription": "8.4.1 Finish stairs are either constructed in place or shop built; site built stairs tend to be fitted more closely to the walls - Stair treads are usually made of wear-resistant hardwoods like oak and maple, whereas the risers and stringers are made of any reasonable hardwood like oak, maple or Douglas fir Proportioning of Stairs: BOCA National Building Code specifies: (a) Stairs within a residence to have a minimum width of 36 , maximum riser height of 7 3/4 , minimum tread width of 10 and a minimum headroom of 6\u20198 ; (b) Nonresidential stair with a occupancy load of 50 persons or fewer to have a minimum width of 36 , maximum riser height of 7 , minimum tread depth of 11 and minimum headroom of 6\u20198 ; and (c) Nonresidential stair, with a occupancy load greater than 50 persons: Minimum width of 44 , maximum height of 7 , minimum tread depth of 11 and a minimum headroom of 6\u2019 The Design Formula is (2R + T) = 25 for indoors and (2R + T) = 26 or 27 for outdoors.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}