Determine the length of an open wood stringer with the following data: run distance = 3.50m and height of the rise =2.50m.
Using the Pythagorean Theorem:
Assuming 18cm riser, calculate the number of steps:
Use the table for determination of rise and tread:
| NO OF STEPS | LENGTH OF | STRINGER | LENGTH OF | RUN | HEIGHT | OF RISE |
|---|---|---|---|---|---|---|
TREAD
|
TREAD
|
TREAD
|
TREAD
|
RISER
|
RISER
| |
WIDTH
|
WIDTH
|
WIDTH
|
WIDTH
|
HEIGHT
|
HEIGHT
| |
25cm
|
30cm
|
25cm
|
30cm
|
17cm
|
18cm
| |
4
|
1.05
|
1.23
|
0.80
|
1.00
|
0.68
|
0.72
|
5
|
1.31
|
1.54
|
1.00
|
1.25
|
0.85
|
0.90
|
6
|
1.57
|
1.85
|
1.20
|
1.50
|
1.02
|
1.08
|
7
|
1.84
|
2.16
|
1.40
|
1.75
|
1.19
|
1.26
|
8
|
2.10
|
2.47
|
1.60
|
2.00
|
1.36
|
1.44
|
9
|
2.36
|
2.78
|
1.80
|
2.25
|
1.53
|
1.62
|
10
|
2.62
|
3.08
|
2.00
|
2.50
|
1.70
|
1.80
|
11
|
2.89
|
3.39
|
2.20
|
2.75
|
1.87
|
1.98
|
12
|
3.15
|
3.70
|
2.40
|
3.00
|
2.04
|
2.16
|
13
|
3.41
|
4.00
|
2.60
|
3.25
|
2.21
|
2.34
|
14
|
3.67
|
4.31
|
2.80
|
3.50
|
2.38
|
2.52
|
15
|
3.94
|
4.62
|
3.00
|
3.75
|
2.55
|
2.70
|
16
|
4.20
|
4.93
|
3.20
|
4.00
|
2.72
|
2.88
|
17
|
4.46
|
5.24
|
3.40
|
4.25
|
2.89
|
3.06
|
18
|
4.73
|
5.55
|
3.60
|
4.50
|
3.06
|
3.24
|
19
|
5.00
|
5.85
|
3.80
|
4.75
|
3.23
|
3.42
|
20
|
5.62
|
6.16
|
4.00
|
5.00
|
3.40
|
3.60
|
Identify 14 steps yields 4.31 stringer length by 30cm tread width; the run at 30cm = 3.50 and the height of rise at 18cm = 2.52.
Back to 6.0. Estimating Staircases
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