Removing Mold from Plywood

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Forum topic by IHRedRules posted 08-01-2014 02:04 AM 745 views 0 times favorited 3 replies Add to Favorites Watch
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89 posts in 897 days

08-01-2014 02:04 AM

Recently I had 5.5” of rain in about 3 hours. With all that rain, it had no where to go, so it flowed right through my garage. I happened to have a nice full sheet of 1/4 sawn oak plywood sitting on end on the with the bottom touching the floor and it obviously got wet on the bottom. At first there was a visible water stain where it got wet, and I figured I would just discard that part and move on, as it was only ~4-5”. I recently used the upper portion that was no where near the water and made a bookcase and all turned out well with that. Today I was looking at the scraps that I had left over and was thinking about using them to make a small 2 shelf nightstand/bookcase, but I noticed that some of the scraps near the area that was saturated have mold on them. Does anyone have any suggestions how to best remove the mold?

3 replies so far

View Dark_Lightning's profile


2620 posts in 2530 days

#1 posted 08-01-2014 02:12 AM

Bleach. That may do things to the wood that you won’t like. I personally would throw it out, while gritting my teeth in pain. QSWO is one of my personal favorites. JMHO, maybe there is another solution.

-- Random Orbital Nailer

View bigblockyeti's profile


3573 posts in 1141 days

#2 posted 08-01-2014 03:09 AM

+1 to bleach, put it out in the sun and let it dry out completely.

View Crank50's profile


170 posts in 997 days

#3 posted 08-01-2014 02:49 PM

I am treating a sheet of 3/4 cabinet ply right now. I will use it in my shop but I wouldn’t put it in anything I’m going to sell.

The best solution I have come up with is “bleach AND Borax”.

The ply must be very dry first.
Sand or wire brush the surface and vacuum clean.
Mix a cup of bleach with 1/2 cup of Borax. (you get Borax at the grocery, in laundry detergent aisle)
I use a scouring pad, like you clean the grill with, dip it in the bleach/Borax mixture then scrub with the grain.

Note, this will raise the grain on the wood but it can be sanded later.
Let the bleach/Borax dry over night and the next day there will be a powdery residue where the borax remains after the liquid bleach evaporated. Leave it like this till you use it because the Borax prevents the return of the mold.

When you do use this wood, just wipe off the powder and sand the grain as usual and apply finish.
I often apply a mildewcide to my finish just to be safe.

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