What Are the Four Types of Section Two Grades of Plywood?
Plywood grades reflect the quality of the wood, and are an indication of not only the aesthetic qualities of the board but also the strength of the wood. Plywood may be given two grades, one representing the front and the other representing the back. Occasionally an X is present in the grading, which indicates that the center board is made of scrap pieces. Along with the grade, two measurements are given to indicate the span that the wood can cover for roofing or subflooring. Does this Spark an idea?
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Grade A
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The best plywood has a very smooth surface. The surface will not show any open defects, although repairs may be made as needed. This grade of plywood is often used for furniture or when the appearance of the structure is important. Grade A-A or A-B plywoods are common in projects that require a high-quality appearance and feel.
Grade B
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The solid surface of this plywood may contain splits; however, such splits do not exceed 1/32 inch in size. Repairs may be made to the boards to plug any defects; after the repairs are made, the entire board is made smooth so that there is not a noticeable difference between the natural wood and the plugs. Utility-grade plywood (B-D) is most suitable in projects where one side is painted, or for exterior projects such as landscaping and fencing.
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Grade C
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The wood maintains its required strength even with splits and knots. The splits may be up to 1/2 inch wide, and the knots can be up to 1 1/2 inches in size. If the wood is strong, these defects will not degrade the board. These boards will often be rough and lack a sanded finish.
Low grade C-C woods withstand harsh weather conditions when used for exterior projects or for backing tiles and walls as well as sub-flooring.
Grade D
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This veneer is the lowest quality wood, as shown in its rough appearance and various knots, which may be open up to 2 1/2 inches. Repairs are not made on these boards. This wood is most often used as an underlay for carpets or back panels in construction.
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References
- Photo Credit Unfinished Plywood Background image by Gary Chorpenning from Fotolia.com
