How To Calculate Roof Area Using a Custom Column Formula
Posted by Adam Schutz on 12 July 2016 10:20 PM


users have asked if Revu’s builtin measurement tools are able to calculate the area of a roof from a plan view. This calculation is important because it can greatly affect your estimates, the air circulation in a room, and more. The Custom Columns in Revu’s Markups tab supports formulas and math constants, functions and operators. This makes it possible for you to use more complex formulas that will come in handy when performing roof calculations. These new functions include sin, cos, tan, asin, acos, atan, sqrt, log and ln. The values of Pi and e are also supported. Getting startedFirst, you need to know two specific values in order to calculate the area of a roof: (1) the area of the roof in plan view and (2) the angle of the roof pitch. These two values can be calculated to provide the actual roof area. Two User Defined Columns need to be created. The first is for the roof angle and the second is a formula that calculates the area. Create the User Defined Columns
Here’s how the window will look when creating the Roof Area formula: Here is the dialog you should see after both new columns are created: Measure the Roof
PDF after the Angle and Area measures are created: Doubleclick in the Roof Angle column of the Area Measurement, type the roof angle and press enter: The Roof Area is calculated: OptionalYou may want to hide the display of the area value in the plan view to avoid confusion:
Explanation of the formula
Area is the value of the Area measurement. Roof Angle is the value in the User Defined Column that you created. Cos is the math function cosine Pi is 3.14  
