Does pressure-treated wood need to be painted, stained, or waterproofed?

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Yes, sealing a deck will reduce the severity of the woods reaction to wet and dry weather cycles. A coating should be applied to minimize the effects of water damage. Treated wood should be cleaned and re-sealed yearly to maintain optimum appearance. Unprotected treated lumber will change color, split, crack, and warp as a reaction to the changing weather.
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