A Check is a separation of the wood normally occurring across or through the rings of annual growth and usually a result of seasoning. [Standard Grading Rules for Northeastern Lumber para. 704.0]
SPF Characteristics 102: Fiber Failures
This course will cover a number fiber failures that can occur in lumber important to the grading process.
SPF 102: Checks
SPF 102: Surface Checks
SPF 102: Through Check
SPF 102: Splits
SPF 102: Shake
SPF 102: Compression Failure
SPF 102: Timber Break
Timber Breaks are stress related fractures to the wood fiber which are believed to be a result of irrepressible forces applied to the living tree, such as sustained high winds, or the prevailing impacts, vibrations, and bending that can occur during felling. The affected fibers of a Timber Break are not always perceptibly open or separated and it can be challenging to identify them in rough lumber; consequently, breaks are generally more visible in surfaced lumber.