11·Th e following questions are specific to code requirements stated below.All c
ID: 1713609 • Letter: 1
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11·Th e following questions are specific to code requirements stated below.All calculations must be in English measurements (leet and inches): New York State Building Code requirements MasineamMinimum MioenMm Width 6 (915) Stair within a residence Nonresidential stair serving an occupant load of less than 50 Nonresidential stair, serving an occupant Height Riser Heigh. Tread Depth Hrahom 1 44" (1118mm) 178 mm) load of 50 or more The ratio of R- riser height and T tread depth in accordance with New York State Code is 2(R) T-25. Based on stair within a residence information above and the minimum acceptable riser height for this exercise is 7.5-inches and the height from floor to floor is 10-feet. Determine the correct answers to the following A. 2(7rom 1519-_25 Ans: a) Number of risers: b) Number of treads: Ans: c) Depth of tread: Based on the information above in reference to a stair within a residence and solving for the depth of tread in compliance with New York State Code ratio 2 (R) + T = 25, which of the following combination of stair riser number and height are: B. a) 15 risers at 8-inches each b) 17 risers at 7.06-inches each c) 20 risers at 6-inches each d) b and c e) All of the above Ans:Explanation / Answer
A :
a) Number of riser = (10 x 12) / 7.5 = 16 risers
b) Number of treads = (16 - 1) = 15 treads (As the start and end tread are landings)
c) Depth of tread = 25 - 2R = 25 - (2 x 7.5) = 10 inches
B:
From the code consideration of 2R + T = 25 , option (b) gives the optimum value closer to 25.
minimum tread depth from code (T) = 10 inch
riser height = 7.06 inch
-----> 2R + T = (2 x 7.06) + 10 = 24.12
therefore option (b) is close and comes out to be efficient and economical.
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