Strength Graded Timber is timber that has been graded in strength classes. Grading is the way of assessing the strength of timber depending on its species and grade. To make things easier, the species and grades are combined into classes of similar strength. Classes are arranged weakest to strongest depending on the number. The different grades for timber include C16, or C24. C16 is the main grade of timber and is mostly used for building work in roof/floor joists.
CLS or Canadian Lumber Standard is primarily used externally and internally timber frame home construction. There are a wide range of sizes and grades available. It is produced from kiln dried spruce, then planed and finished with eased edges to very precise tolerances.
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