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Quality Materials & Service to the North West since 1974


C16 and C24 structural timber, what’s the difference?

C16/C24 is the strength grade of the timber, this can be graded visually (BS5268) by a registered qualified grader or by machine. Graders evaluate the timbers characteristics, taking into account any knots, fissures, or slope of grain, etc. to determine its strength class.

Softwoods are graded visually in accordance with BS 5268:2007, or by machine to EN 14081:2005.

C16 graded structural timber is the most cost-effective option and meets performance requirements. Kiln-dried C16 is generally recommended for most applications if the correct spans are used and are mainly used internally for floor and roof joists. Lengths commonly available are 3.0, 3.6, 4.2, and 4.8 meters.

C24 graded Premium structural timber is a stronger, more demanding grade and has fewer/smaller knots than C16. C24 is best used where higher loads or wider spans are required. C24 will carry a higher point load than C16 grade.

Please note: not all lengths are available across our branches. For more information, please contact your local branch.


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