Quote:
Originally Posted by Orion
20-year old PT decking is definitely not the same as the new (less than 10 year-old) stuff. I have similar decks at one house that are close to 30 years old and are still solid. The decking I have at the lake has boards rotting at 8 years and less. Granted, there is more humidity at the lake, but PT is supposed to hold up to moisture, and doesn't any more. When they changed the PT formula, along with the newer less-dense pine stock, we got a much less durable product. It does require regular treatment, which I am averse to doing over water on the dock.
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Are you sure the boards you got where Pressure treated, and not just Thompsonized?
The Thompsonized wood doesn't hold up nearly was well as true pressure treated wood does.