F27
High-strength hardwood stress grade with approximately 27 MPa characteristic bending strength, used for heavy structural members and exposed-feature beams.
A premium hardwood stress grade under AS 2082, with a characteristic bending strength of approximately 27 MPa and a modulus of elasticity around 18 GPa. F27 is specified where high loads or long spans are required, including bridges, wharves, large lintels, and exposed feature beams. Design values are referenced from AS 1720.1. Typical species supplied as F27 include ironbark, spotted gum, and blackbutt. F27 is dense, durable, and almost always supplied as kiln-dried, dressed (DAR) sections for joinery use or rough-sawn for structural uses. For buyers, F27 attracts a price premium and longer lead times; specifying it where F17 is sufficient adds cost without engineering benefit. Always cross-check the engineer's specification.
Values and references on this page are indicative and drawn from common industry sources. Always verify the current AS/NZS standard, manufacturer data sheet or NIAA policy publication before relying on figures for design, specification or compliance work.
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