How to Seal Pressure Treated Lumber
Pressure treated lumber is used in a variety of projects, from mailbox posts to decks. The lumber is infused and covered in a chemical preservative that prevents rodents, insects and fungus from destroying it, but you still need to seal pressure treated lumber to protect it from the elements of nature. Sealing the lumber requires the appropriate water-repellent sealer and a few tools. Does this Spark an idea?
Things You'll Need
- Water-repellent sealer (with synthetic oils and resins)
- Paint roller with stick
- Paint pan
- Rags or shop towels
- Wide paint brush
Instructions
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Clean the pressure treated lumber using a pressure washer (set between 1500-2500 PSI) or by using a water hose with a sprayer. If cleaning cedar or redwood pressure treated lumber, set the pressure washer to 1200-1500 PSI. Remove all dirt, leaves and other debris. Let the wood dry completely before moving to the next step. (Note: Some sealers can be applied on wet surfaces; check the product's label to verify.)
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Pour sealer into a paint pan, assemble the paint roller/stick and start applying the sealer. If applying sealer on a deck, start in the farthest corner and work your way out. If applying to a smaller wood construction, apply with a wide paint brush. Check the sealer's directions for the amount of coats to apply. Normally, one coat is sufficient.
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Apply sealer, using a wide brush, to the areas you can't reach using the roller. Allow the sealer to dry according to the product instructions or at least overnight before walking on the surface or using the object.
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Tips & Warnings
Use a water-repellent sealer that contains synthetic oils and resins. Don't buy a sealer that only repels water. Don't use a sprayer to apply the sealer--it is hard to control and cleanup can be difficult.
