LumberJocks

Question about green mold on plywood.

  • Advertise with us

« back to Wood & Lumber forum

Forum topic by eddit posted 03-03-2021 02:43 AM 424 views 0 times favorited 11 replies Add to Favorites Watch
View eddit's profile

eddit

16 posts in 920 days


03-03-2021 02:43 AM

Most of the mold-related post here were about drying lumber so I wanted to ask a new question about my issue.

I use 1/2 walnut or maple veneered plywood for back panels on furniture projects. I had some extra from my last project so I tossed it in the shed in the summer.

Pulled it out today and noticed spotty green mold growth similar to this photo:

I was able to wipe it off easily with a few moist paper towel, and I gave the whole board a light sanding.

My question: am I good to go, or should I take a further step of wiping the board down with denatured alcohol or mineral spirits?

Needless to say I won’t be storing lumber in my shed over the summer anymore.


11 replies so far

View Rick  Dennington's profile

Rick Dennington

7158 posts in 4250 days


#1 posted 03-03-2021 06:53 AM

I’ve had this happen to me a few years ago. To answer your question, take a 1/3 cup of bleach or less and a gallon of water…...mix throughly, and wipe the plywood down, saturating it all over. You should see the mold starting to disappear…...!! Let the mixture set for a few minutes, then wipe it down…again, and let it dry. That should do it.

-- " There's a better way.....find it"...... Thomas Edison.

View Axis39's profile

Axis39

460 posts in 652 days


#2 posted 03-03-2021 02:49 PM

I have been told that household bleach is not strong enough to kill mold spores. I would never water it down and expect it to work as a long term solution. I am not a mold specialist, but that was advice I have been given in the past.

There are several products available in any hardware type store. I’ve used Mold Armor a good bit and found it to work quite well.

-- John F. SoCal transplant, chewer uppper of good wood

View eddit's profile

eddit

16 posts in 920 days


#3 posted 03-03-2021 04:23 PM

Thanks fellas. I’ve decided to use the piece for shop jigs instead, and to just buy a new piece for the current furniture project. Either way I’ll do a heavy wipe-down of denatured alcohol (no water) to kill any lingering mold spores. Thanks for taking the time to chime in.

View Lazyman's profile

Lazyman

6932 posts in 2443 days


#4 posted 03-03-2021 04:41 PM

Heat is the best way to kill it but it might need to get too high and for too long for the plywood. Fungus mycelium can grow deep enough into the wood to avoid any surface treatments so you may have to heat it long enough to raise the internal temperature to the lethal point. I am not sure how well the plywood will handle that.

BTW, that probably indicates that the moisture content got pretty high so you might want to check that if you have a meter. You also might need to reconsider storing wood in that shed if the MC is high enough for fungus to grow.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

View eddit's profile

eddit

16 posts in 920 days


#5 posted 03-03-2021 04:42 PM

Yep I agree. Its dark, with limited air circulation. Definitely not doing that again.

View Aj2's profile

Aj2

3765 posts in 2853 days


#6 posted 03-03-2021 05:07 PM

Is it weird that I think the green mold with the tan and yellow background is pretty.

-- Aj

View MrUnix's profile (online now)

MrUnix

8513 posts in 3254 days


#7 posted 03-03-2021 05:29 PM

Is it weird that I think the green mold with the tan and yellow background is pretty.
- Aj2

To me, it looks like some aerial photography of a flowing open field with a few trees scattered around ;)
Kind of reminds me of Iowa!

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View Aj2's profile

Aj2

3765 posts in 2853 days


#8 posted 03-03-2021 06:13 PM

Nature’s art. :)

-- Aj

View ColoradoJake's profile

ColoradoJake

29 posts in 702 days


#9 posted 03-03-2021 06:17 PM

I used to be in mold remediation and I know first hand that bleach will not kill mold. All bleach does is literally bleach the mold, make it clear. I am unsure on denatured alcohol. Many of the mold killing products we used were natural and the main active ingredient was Thyme.

Take this for what you want, but please stay safe.

View Aj2's profile

Aj2

3765 posts in 2853 days


#10 posted 03-03-2021 07:48 PM



I used to be in mold remediation and I know first hand that bleach will not kill mold. All bleach does is literally bleach the mold, make it clear. I am unsure on denatured alcohol. Many of the mold killing products we used were natural and the main active ingredient was Thyme.

Take this for what you want, but please stay safe.

- ColoradoJake

In my roofing days we sometimes see black mold in areas that had a long time leak. So long that ants seemed to like the rotting timbers. Or the mold

-- Aj

View Vintagewood1960's profile

Vintagewood1960

63 posts in 1553 days


#11 posted 03-21-2021 01:31 AM

I had a similar issue and researched white vinegar as the best solution. I used it before painting my already ruined cherry veneered plywood. It was ruined by bad advice to use bleach.

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com