Roof Truss Calculator

How to Use the Roof Truss Calculator

The Roof Truss Calculator is a tool designed to help you estimate essential parameters for constructing roof trusses efficiently. By following this step-by-step guide, you can input the necessary measurements and obtain calculated results to aid in your planning process.

Step 1: Enter Building Dimensions

Start by specifying the dimensions of the building:

• Building Width (meters): Enter the width of the building. This value is crucial for calculating the truss height and rafter length. Make sure your input is between 1 and 30 meters, and it can be precise to one decimal point (0.1 meter). This field is required.
• Building Length (meters): Enter the length of the building. This measurement helps determine how many trusses are needed. Ensure the value is between 1 and 100 meters, allowing for a fraction up to one decimal place. This field is also required.

Step 2: Select the Roof Pitch

Select the preferred roof pitch from the options available in degrees. This choice impacts the roof truss height and rafter length calculations:

• Roof Pitch (degrees): Choose one of the predefined angles: 14°, 18.4°, 22.6°, 26.6°, or 30.3°. This field is mandatory.

Step 3: Choose Truss Spacing

Select how closely spaced the trusses should be:

• Truss Spacing (meters): Choose between spacings of 0.6 meters (equivalent to 24 inches) or 1.2 meters (48 inches). This selection is necessary to determine the number of trusses required and their maximum load.

Step 4: Input Snow Load

Enter the anticipated snow load for the roof:

• Snow Load (kN/m²): Provide a value that represents the expected snow load. It must range between 0 and 10 kN/m² and can include a decimal up to the nearest tenth (0.1). This field is essential for accurate load calculations.

Step 5: Review Results

After entering all necessary inputs, the calculator will generate various results:

• Truss Height: This output shows the calculated height of the truss, provided in meters with two decimal places.
• Rafter Length (per side): Discover the rafter length for each side, also measured in meters and detailed to two decimal places.
• Number of Trusses Required: Determines the total number of trusses you’ll need, calculated to the nearest whole number.
• Total Roof Surface Area: Get the total roof area in square meters, rounded to two decimal places.
• Maximum Load per Truss: Calculates the maximum load each truss must bear, presented in kiloNewtons (kN) with two decimal places.

Use this calculated data to plan your roof truss construction accurately. The careful provision of accurate input information will ensure the precision of the results.