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What you need to know
Pine preserved with chromated copper arsenate (CCA) has been phased out by the EPA. Alternative treatments include copper azole (CBA) or alkaline copper quatenary (ACQ).
Lumber is more insect-and fungus-resistant when chemicals are forced into the wood.
Can last up to 30 years with diligent upkeep. Wash at least once a year using deck wash or a power washer, and finish with a preservative sealer. Requires regular maintenance.
$1.20-$2 per square foot, uninstalled. Prices vary by grade, region, and season.