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Old 09-21-2012, 10:33 AM   #1
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One yr. old pressure treated wood pergola turning green


I have a one year old non finished pressure treated wood pine pergola (no floor) that needs to be stained here in Ohio. Since we power washed it a month ago, 2 of the vertical posts have turned darker brown and green on the entire east side and the other 2 posts are doing the same on the west or south side (east side gets 3/4 day full sun).

The green does not look like mold what is causing it? The wood is not gray but is turning brown. Do we need to use a deck cleaner to restore the wood before staining?

I've tested 3 semi-transparent water base acrylic stain colors, one is darker "brick red" similar to cedar red, the other a lighter yellow orangish tone that gives the aging wood a pleasing warm look whether it is over the greenish part or not.

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Old 09-21-2012, 10:36 AM   #2
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One yr. old pressure treated wood pergola turning green


Without a picture it hard to say.
New pressure treated wood is treated with copper. Copper turns green when it oxidizes.
May want to hit it with a deck brightner.

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Old 09-21-2012, 11:00 AM   #3
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One yr. old pressure treated wood pergola turning green


I will give it a shot without a picture!

If the treatment contained copper, when you pressure washed you probably accelerated the oxidation. As you know copper develops a natural green patina over time. I guess it could be moss spores trying to establish themselves depending on where you are. Unlikely since you say the east side which is turning green is in full sun.

If the pergola has been sitting a year without staining, I would clean it so you know you have a good starting point. Then if you found a semi-transparent stain that looks nice go for it. You can always step up to a semi-solid or even a solid if you find dramatic discoloration. It sounds from your sample things will be just find.

Please do not tell us you are using Behr?

By the way, next time you log in you might want to update your profile with basic geographic information so we know where you are. Knowing can be helpful in answering your questions.

Last edited by user1007; 09-21-2012 at 11:03 AM.
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