3/24/2024 0 Comments Wood scaffold planks chico caFor this reason, planks that appear to be lighter than normal should not be used. However, planks that are substantially infected are usually lighter than sound planks of similar size and species. This condition is not easily recognized in its early stages, especially if the exterior of the planks has been weathered. Planks can also be weakened by a condition known as dry rot. Planks with spike knots should be rejected. On the edges there should be no knots larger than 10 mm or 3⁄ 8” in the middle third of the plank. For 2” x 12” planks the maximum is 60 mm or 2 3⁄ 8”. The maximum allowable size for the wide face of a 2” x 10” plank is 50 mm or 1 7⁄ 8”.
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