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Tricks for Treated Lumber

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No Perfect Finish Solution
Enlarge Image
Clear film finishes adhere only to the
top layer of cells. When the wood
sheds the sun-damaged cells, the
film quickly sloughs off.
Enlarge Image
Oil-based, penetrating finishes
combine a natural wood look with
UV-protection and ease of

No Perfect Finish Solution

But can I finish it?

PT lumbers' transformation to a weathered gray color is almost as inevitable as the sun and rain, primarily because it is caused by the sun and rain. Because there's no perfect finishing solution, you must choose either a durable finish that hides the wood grain or a lightweight finish that requires frequent reapplication.

Any outdoor finish heavy on pigments, such as paint or solid-color stains, provides the best protection against damaging UV light. Without those sun-screening pigments, clear, film-forming finishes, such as varnish and polyurethane, quickly slough off as the wood's surface degrades, shown in photos. Skip these clear or low-pigment finishes unless you enjoy refinishing every 6-12 months after a thorough sanding.

For a good compromise between the two, choose a penetrating-oil finish with finely ground, UV-inhibiting pigments, such as Penofin 550 (Performance Coatings, 800/736-6346,; Ready Seal (Ready Products, 888/782-4648,; or Total Wood Preservative (Gemini Coatings, 800/262-5710, The near-microscopic trans-oxide pigments effectively block most UV rays. You'll have to re-coat about every two years, but because you don't have to remove the previous finish, application is easy compared to other options.

Continued on page 5:  Alternative Outdoor Woods


Comments (2)
benewah67 wrote:

where do you find .60 treated deck material

1/4/2012 03:53:16 PM Report Abuse
TXwoodrat wrote:

Always check the number on the label stapled to the wood, .20 Won't last long. Most big box stores only carry .20. If you want your treated lumber to last any length of time get .40 or above. I only buy marine grade .60 when I buy treated lumber. Landscape timbers are all rated .20, so expect to replace them much sooner than you would think. Note that the .20 label says "not for ground contact," but these are "landscape" timbers so does that make sense?

6/15/2011 12:16:16 PM Report Abuse

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