How to Use the Ventilation Calculator

A step-by-step guide to using the Ventilation Calculator.

The Ventilation Calculator is a tool designed to help you determine the necessary roof ventilation for your project based on the roof size, predominant pitch, and existing attic vents. Follow these step-by-step instructions to use the calculator. 

Step 1: Access the Calculator

To begin, navigate to the Roof Ventilation Calculator on your project. 

Step 2: Input the Roof Size

1. Locate the Roof Size field.
   
   

2. Enter the total roof area in square feet (SQ). This value should represent the entire roof’s surface area.

   

Step 3: Input the Predominant Pitch

1. Locate the Predominant Pitch field.

2. Enter the roof’s pitch as a ratio (e.g., 6/12).

   

Step 4: Select Existing Roof/Attic Vents (Optional)

1. Locate the Existing Roof / Attic Vents dropdown menu.

2. Click on the dropdown to see the available vent types.

   • Options include:

     • Turtle

     • Ridge

     • Power

     • Turbine

     • Gable

3. Select the type of vents that are already installed on the roof (if applicable). This step is optional but helps provide more accurate calculations.

   

Step 5: Calculate the Results

Click "calculate" to determine the total number of vents required for proper ventilation. Adjust the inputs if necessary to refine the results.

Step 6: Create the Report

Click Create Report to get a full PDF of the roof estimate. 

This report can be printed or shared.