What lumber grade has > 80% clear wood?

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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What lumber grade has > 80% clear wood?

 
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Lumber grade-

Lumber is a sawn and formed wood product made from harvested tree timbers. Due to the fact that wood is not of uniform consistency, it will have faults that will affect the appearance of the lumber produced from the wood source, as well as the structural features.

In the United States, lumber is given a grade that establishes a level of consistency in the mills' final products. These grades are used to both describe the quality of the lumber products delivered and to give the buyer a way to estimate the cost and waste associated with using a specific grade of the product as raw material.

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