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Forum topic by scot2 posted 875 days ago 706 views 0 times favorited 6 replies Add to Favorites Watch
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scot2

3 posts in 875 days


875 days ago

Topic tags/keywords: frozen mildew mold green thaw

I picked up some “pressure-treated” 2×4s at a covered, outdoor lumber yard here in the midwest. Since the weather is cold the wood had some ice on it, I’m assuming based on the moisture from the wood.

After 24 hours of being indoors they began to thaw. I’m noticing now some green streaking along the grain. Could this be mildew?

I want to use the wood in contact with other wood, but I’m afraid it might be contagious so to speak. These pieces will be hidden, so the green color doesn’t necessarily bother me.

Thanks.


6 replies so far

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patron

12976 posts in 1945 days


#1 posted 875 days ago

copper oxide is to keep mildew and fungus from rotting the wood

they don’t kiln dry PT
(notice how some is very heavy)

the streaking is the moisture and color mixing

not to worry
it does it’s job well

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

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scot2

3 posts in 875 days


#2 posted 875 days ago

Thanks for the quick response patron. Right, the label on the wood says Micronized Copper Azole.

Thanks again. I’ll wait a week to be sure it’s as dry as it can get, then proceed.

View treaterryan's profile

treaterryan

109 posts in 891 days


#3 posted 875 days ago

Most pressure treated wood is either steam dried in the cylinder or kiln dried, especially for poles and dimensional lumber. On dimensional lumber, the Moisture Content is not to exceed 19%MC (This is straight out of the AWPA BOS) after treatment. The Copper in MCA can react with the resin in the wood and leave the blue-green color streaks along the grain that you are speaking of. These streaks fade fairly quickly with exposure to the elements. Sometimes, the streaks will ‘fade’ into a white granular substance – this can be removed with mineral spirits or just some simple light sanding.

-- Ryan - Bethel Park, PA

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treaterryan

109 posts in 891 days


#4 posted 875 days ago

Another Note with MCA Lumber: Use Ceramic Coated or Stainless Steel Fasteners. It is less corrosive than other waterborne preservatives, but SS or CC fasteners are still required.

-- Ryan - Bethel Park, PA

View Bill White's profile

Bill White

3353 posts in 2565 days


#5 posted 875 days ago

And further more. Don’t get any of the sawdust inside your sweaty “T” shirt. Wahhhhh!
Bill

-- bill@magraphics.us

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scot2

3 posts in 875 days


#6 posted 875 days ago

treaterryan, thanks for the additional info.

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