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We have new armstrong wood flooring in large areas of our downstairs. Three months after installation we noticed several areas that appear darkened. They look wet, however we had a leak detection service out and there is no moisture or leak. Any ideas as to the cause?
 

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Ok, what's under the flooring?
Slab, crawl space, basement.
Any vaper barrier under the flooring.
If there's a crawl space is there a 6 mil. plastic vaper barrier on the ground?
What type wood is it.
Is it changing color near a window that gets direct sun?
Was a moisture test done before installing the floor?
 
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Very likely caused by the sun---You did not mention the type of wood----Maple and cherry both darken within a year or two----
 

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i put brazillian hardwood down in my house and within 3-4 months it had darkened to a nice reddish brown from the sun and the natural oils in the wood, but we knew that before hand that is why we chose it. i vote for sun exposure also.
 
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