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is this a byproduct of the pressure treatment or just plain old mold like I suspect it is?
Yes. It's a chemical treatment residue; the stuff that's forced in to the wood fibres when it's pressure treated. It disappears over time.
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That's pretty vibrant mould. I'd say pressure treatment. It's a good eg of the problem with deliveries from these chains. Once had a load of insulation which was soaked at one end - as it had obviously been stood up in a puddle after some heavy rain.
I'm sure it'll fade. If you're worried clean with oxygenated bleach. If you don't have any you can use oxy powder instead - basically the same.
It'll fade anyway and as they're steps will get dirtier than the rest too.
Howard
hugo7
@HatBeard
was being lazy as I don't have my workshop setup yet and ordered an overpriced decking step kit from b&q so I can just assemble it and not have to fuck about with cutting things to size while in the middle of the full house redecoration.
I am going to own my ignorance completely here, the package turned up completely soaked inside the plastic wrap and half the planks are green with dark green splotches.
is this a byproduct of the pressure treatment or just plain old mold like I suspect it is?
I realised putting moldy planks on the deck was a bad idea as soon as I took this pic so they are drying out in the sun with a sheet of plastic under them now.
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