C16 refers to the strength grade of the timber, this may have been graded visually by a registered grader or alternatively with a machine. C16 structural grade timber is generally the most cost effective option and can be used for small building jobs such as roof extensions and joist work.
C16 and C24 represent two distinctly different types of softwood timber, basically pine. The reason there is a difference relates to how quickly the pine trees the timber came from grew.
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