How often should I seal my pressure-treated deck? Every year 13% Every 2-4 years 68% Every 4-6 years 13% Every 8-10 years 4% Get Free Quotes Today! Question: How often should I seal my pressure-treated deck? Top Answer (68% of 22 votes): Every 2-4 years. Answer: Every 2-4 years Explanation: Check your climate area and manufacturing directions. Colorado Concrete Answer: Every year Explanation: Every year with a good sealer will let make the existing deck a lot longer. Family Flooring Co. Get Free Quotes Today! Find Local Pros Free Staining a Deck Cost Estimates Related Questions Estimated Cost of Staining a Deck How long should I wait to stain my deck after pressure washing?Top answer: One day Do I need to seal my deck after staining it?Top answer: Yes Do I need to sand my deck before staining it?Top answer: In some cases Should you prime a deck before staining it?Top answer: No, never