Plywood that is made entirely of Douglas fir or western larch with all veneer plies being Grade B or better and is sanded on both faces or includes medium- or high-density overlay with maximum core-gap sizes of 1/8 of an inch; is exterior-rated with fully waterproof structural adhesive glue; and is not treated with decay-resistance chemicals. Where decay is a concern, it should be preservative-treated.
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