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White build up on pressure treated wood

Postby Bob2021 » Tue Dec 07, 2021 11:16 am

Hi all,
I've just got garden arches from B&Q and they are covered in lots of green and white marks/stains. After searching internet, i am coming to conclusion that the green marks are the result of a copper based treatment, but I cannot find any info about the white spots. I worry that it could be white mold forming on the surface which isn't ideal, as the arches weren't cheap and I would like them to last a long time, plus it looks bad.
My question is, if this is something normal (effect of pressure treatment), or not?
Thanks for any comments.
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Simply Build It

Postby stoneyboy » Wed Dec 08, 2021 9:47 pm

Hi bob2021,
The white salts appearing on the surface come from the chemicals used to treat the timber. If the arches are for outside rain should wash them off, eventually.
Regards S
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