How to Design a Sloped or Angled Member

To calculate a sloped member in ClearCalcs, you need to use user formulas to adjust lengths and support locations by the rise/run or degrees of the given slope. In this way, you can still enter the length of a rafter from the plan drawing and adjust it in ClearCalcs using the simple formulas below.

Using Rise/Run

The formula for 7:12in rise over run is:

Member Length * SquareRoot(Rise^2+Run^2)/Run =5ft * sqrt(7^2+12^2)/12

Sub in the rise required rise and member length

Example 1: 5ft beam with rise of 7:12 inches

Using Degrees

You can also adjust the length of a member based on degree slope:

Member Length * 1/cos(theta) =5ft * 1/cos(30deg)

Example 2: 5ft beam with slope of 30 degrees - N.B. You need to specify either 'deg' or 'degree' units for the degrees so it calculates correctly

Using a Slope Factor

You can also multiply the plan length by the appropriate slope factor.

Get in Touch with ClearCalcs

Chat with our Customer Success team and get product or account support directly to your inbox.