These rules apply to bundles of dressed lumber, packaged lumber, building products such as plywood, wallboard or other materials of similar shape. Any lumber load that is bundled and layered and stands 6ft. or more above the trailer deck, must have belly wraps over the second tier or over a middle tier of bundles if there are more that 2 tiers, with a minimum of two tie downs if the bundles are of 5ft. in length or longer.
This rule will also apply to bundled pipe loads.
Source: HERE
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