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1 Presentation 38: STAIR SAMPLE CALCULATION. 2 Sample Stair Calculation 8′-0″ 11 ¼″ Given: –Upper Const. = 11 ¼″ –Floor to ceiling = 8′-0″ –Headroom =

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Presentation on theme: "1 Presentation 38: STAIR SAMPLE CALCULATION. 2 Sample Stair Calculation 8′-0″ 11 ¼″ Given: –Upper Const. = 11 ¼″ –Floor to ceiling = 8′-0″ –Headroom ="— Presentation transcript:

1 1 Presentation 38: STAIR SAMPLE CALCULATION

2 2 Sample Stair Calculation 8′-0″ 11 ¼″ Given: –Upper Const. = 11 ¼″ –Floor to ceiling = 8′-0″ –Headroom = 80″ –Unit Run = 10 ¾″

3 3 Sample Stair Calculation 8′-0″ 11 ¼″ Find: –Total rise –# of risers –Unit rise –Stairwell length

4 4 Total Rise 8′-0″ 11 ¼″ Total rise = 107 ¼″ 8′-0″ + 11 ¼″ = 107 ¼″

5 5 Number of Risers 8′-0″ 11 ¼″ # of risers = 107 ¼″ ÷ 8 =  14 or 15 risers 107 ¼″

6 6 Unit Rise 8′-0″ 11 ¼″ Unit rise = 107 ¼″ 107 ¼″ ÷ 14 = 7.66″ 7 11 / 16 ″ 107 ¼″ ÷ 15 = 7.15″ 7 1 / 8 ″

7 7 Unit Rise 8′-0″ 11 ¼″ 17 to 18 Rule 107 ¼″ Unit Rise 7 1 / 8 ″ 15 risers Since unit run is 10.75″ Best unit rise = = or = is the better choice since is between 17 and 18.

8 8 Stairwell Length 8′-0″ 11 ¼″ Stairwell length = 107 ¼″ 139 ¾″ Unit Rise 7 1 / 8 ″ 15 risers 80″ + 11 ¼″ = 91 ¼″ 91.25″ ÷ 7.15 =  13 treads in opening 13 x = ″

9 9 Conclusion 8′-0″ 11 ¼″ Find: 107 ¼″ 139 ¾″ Unit Rise 7 1 / 8 ″ 7 1 / 8 ″ 107 ¼″ ¾″ 15 risers –Total rise: –# of risers: –Unit rise: –Stairwell length:


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