Spare Cali bamboo, stored in attic, has traces of mildew, is it safe to use?

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glider

New Member
Joined
Mar 11, 2025
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2
Location
USA CA
We had a Cali stranded bamboo floor installed in 2016. We had some leftover, just enough to place in a 100 sf extra room which we'd like to do now. However the flooring was stored in the attic above the garage, and some of the edges (not T&G but whatever the click edge is called) have traces of mildew. The faces are clean.

I have found that with a hand shop broom I can get rid of it, but I'm sure there would have to be traces left. I won't want to install these if it's obvious to you more experienced hands that it's be really dumb to do so. Theoretically I could wipe the edges with an anti fungal. But that's a lot of work; even brushing them all is a lot of work; and this flooring isn't supposed to be exposed to water at all.

We're in California, bay area. We have a slab floor, not radiant heated. It's a floating floor.

Re the original installation, it was not the engineered Cali product, and it's never been what is should have been, because it cupped after a short time. Our flooring contractor had said that our slab had no signs of mildew so for the first installation they didn't seal with epoxy. When it cupped they figured they'd made a mistake by not epoxying, pulled it all out, epoxyed, and reapplied new flooring. That cupped as well.

It might seems counter intuitive to even consider installing this stuff but it would be a perfect color match, and it will have a doorway in common with the 2016 bamboo.

Just edited to include some images; one does show mildew on the face.
 

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Yes with a hand shop broom most of it comes off. I tried some tilex on one that had more than most last night. Some of the mildew seems to be under the surface coating (which is also on the edges), and was not 'erased' by the tilex.
 

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