Roof Truss Calculator
A conceptual calculator to estimate the dimensions and angles of a common roof truss based on span and pitch.
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Guide to the Roof Truss Calculator
An introduction to calculating the dimensions of a common Fink (or 'W') roof truss for your construction project.
A roof truss is an engineered wooden structure used to frame the roof of a building. It provides support for the roof and transfers the load to the building's walls. This calculator helps estimate the dimensions of a common "Fink" or "W" truss, which is widely used in residential construction.
Key Terms and Inputs
- Span: The total width of the building from one wall plate to the other. This is the base of the truss.
- Overall Height: The total vertical distance from the bottom of the truss (the bottom chord) to its highest point (the peak).
- Overhang: The portion of the rafter that extends beyond the supporting wall. This creates the eaves of the roof.
Calculated Dimensions
Based on your inputs, the calculator determines the following lengths for a symmetrical Fink truss:
- Top Chord (Rafter): The main top member of the truss that follows the slope of the roof. The calculation includes the overhang.
- Bottom Chord (Ceiling Joist): The horizontal base of the truss, equal to the span.
- Webs: The internal diagonal members that form the 'W' shape. The calculator provides lengths for the long diagonal webs and the shorter vertical webs.
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