On-Screen Takeoff - 05.05.02 Accounting for Slope in an Area Condition (roofs, slanted ceilings, etc.) - OST
AA-04244
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.
| Degree | Percent (%) | 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.
| Pitch | Degrees |
|---|---|
| 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.
 Using the Rounding Option for Area Conditions |
Creating Count Conditions  |