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OST 3.98 - 05.05.02 Accounting for Slope in an Area Condition (roofs, slanted ceilings, etc.)

Views: 767 Last Updated: 12/16/2021 07:19 am 0 Rating/ Voters
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You can set up an Area Condition to accommodate a sloped plane such as a roof or an angled ceiling.

Set Slope on the General tab as Rise:Run. 

Area Slope Conversions

Use the charts below to convert Degree of slope or Percent (Grade) to Rise:Run.

Note
On-Screen Takeoff uses traditional mathematics to calculate slopes. This may not be the same calculation used for a specific industry.

DegreePercent (%)Ratio (Rise:Run)
0 n/a 0:1
1 1.75 1:57.29
2 3.49 1:28.636
3 5.24 1:19.081
4 6.99 1:14.301
4.7636 8.33 1:12
5 8.75 1:11.43
6 10.51 1:9.5144
7 12.28 1:8.1443
7.125 12.50 1:8
8 14.05 1:7.1154
9 15.84 1: 6.3138
9.4623 16.67 1:6
10 17.63 1: 5.6713
11 19.44 1: 5.1446
11.31 20.00 1:5
12 21.26 1: 4.7046
13 23.09 01:04.3
14 24.93 1: 4.0108
14.036 25.00 1:4
15 26.80 1: 3.7321
16 28.68 1: 3.4874
16.699 30.00 01:03.3
17 30.57 1: 3.2709
18 32.49 1: 3.0777
18.435 33.33 1:3
19 34.43 1: 2.9042
20 36.40 1: 2.7475
21 38.39 01:02.6
21.801 40.00 1:2.5
22 40.40 1: 2.4751
23 42.45 1: 2.3559
24 44.52 1: 2.246
24.228 45.00 1: 2.2222
25 46.63 1: 2.1445
26 48.77 1: 2.0503
26.565 50.00 1:2
27 50.95 1: 1.9626
28 53.17 1: 1.8807
29 55.43 1: 1.804
30 57.74 1: 1.7321
31 60.09 1: 1.6643
32 62.49 1: 1.6003
33 64.94 1: 1.5399
34 67.45 1: 1.4826
35 70.02 1: 1.4281
36 72.65 1: 1.3764
36.87 75.00 1: 1.3333
37 75.36 1: 1.327
38 78.13 1: 1.2799
39 80.98 1: 1.2349
40 83.91 1: 1.1918
41 86.93 1: 1.1504
42 90.04 1: 1.1106
43 93.25 1: 1.0724
44 96.57 1: 1.0355
45 100.00 1:1
90 n/a 1:0

This table shows the Degrees for each Pitch.

PitchDegrees
12 45
11 42.5
10 40
9 37
8 33.75
7 30.5
6 26.5
5 22.5
4 18.5
3 14
2 9.5
1 4

There are several Websites available to learn more about slope:

https://www.archtoolbox.com/representation/geometry/slope.html

http://www.secrets-of-shed-building.com/building-a-shed-roof.html

Caution
These sites are not published, maintained, or endorsed by On Center Software or any affiliate company, and these links are provided only as a convenience. All information contained on these sites should be independently verified for accuracy. On Center Software does not warrant the information or content.

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