Truss Spacing Calculator
Calculate the number of roof trusses required for a given roof length and spacing.
Estimate only — not a substitute for a licensed tradesperson, a certified engineer, or sign-off from your local building surveyor. Verify against current standards and site conditions before ordering materials or starting work.
Result
- Trusses required
- 21
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What this is based on
Governed by AS 1684 and the truss manufacturer's design. This calculator does spacing/quantity layout only. Truss design and permitted spacing come from the fabricator's engineered design for your specific job - not from this calculator.
We cite the clause and link to the publisher so you can read the source yourself. We do not reproduce the text or tables of the NCC or of any Australian Standard.