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Warped Plywood

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Forum topic by tjbisme posted 12-20-2017 12:56 AM 496 views 0 times favorited 8 replies Add to Favorites Watch
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tjbisme

26 posts in 391 days


12-20-2017 12:56 AM

Topic tags/keywords: plywood curve bowed wood bow repair

Is there a way to fix warped plywood after it’s been painted? I made a storage bench out of 1/2 inch plywood and made a lid for it. When I originally installed it, the warp wasn’t as prevalent and was held in place by the hinges on the edges of the lid. I was working on this out in my garage and I’m in Wisconsin. I painted it and everything.
I brought it inside to acclimate it to room temperature, but now the lid bow is way more pronounced.

I’m wondering if I add a 1×4 or 1×6 on the underside of the lid to help keep the bow from being so pronounced if that would work at all? I’m I know I need to get a heater to keep my garage at room temperature, but just wondering what I can do to help lessen the bow.

Thanks,
Trevor Bensen


8 replies so far

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Loren

10476 posts in 3672 days


#1 posted 12-20-2017 01:00 AM

Did you only paint the one face of the lid?

If not, painting it and giving it some time
may help. Putting battens underneath like
you described will almost certainly work
to pull it flat.

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tjbisme

26 posts in 391 days


#2 posted 12-20-2017 01:03 AM

I painted both sides of the lid. What material should use to make the battens?

Thanks!

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Loren

10476 posts in 3672 days


#3 posted 12-20-2017 01:08 AM

Solid wood is fine. Pine is plenty stiff enough
for flattening 1/2” ply.

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tjbisme

26 posts in 391 days


#4 posted 12-20-2017 03:39 PM

I plan on using a 1×2 piece of pine attached on the edge to provide enough ridgidness to keep the plywood from curving.

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tjbisme

26 posts in 391 days


#5 posted 01-04-2018 06:34 PM

I used a 1×2 piece of pine attached on edge to the underside of the plywood lid. It worked out great. It didn’t keep it completely flat, but it minimized it so much you couldn’t tell there was a curve by looking at it. Thanks for all the suggestions!

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dhazelton

2771 posts in 2321 days


#6 posted 01-04-2018 06:55 PM

1/2 inch plywood is pretty flimsy for built ins and furniture – go 3/4 next time and the wood will be less prone to warping.

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tjbisme

26 posts in 391 days


#7 posted 01-04-2018 07:03 PM

Yeah I was trying to keep costs down and it was a rookie mistake. I’m building another bench in somewhat of the same manner, but this time I am going to use 3/4 inch plywood for the top.

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LittleShaver

327 posts in 644 days


#8 posted 01-04-2018 09:36 PM

A little late to the party, but for Christmas, I receive a small box with a two part pivoting lid from my grandson in WI. The box has no finish, but the wood is beautiful and it was filled with my favorite chocolates. A few hours after I unwrapped it, I noticed that the lid was warping. After puzzling about it for a few minutes, I emptied the box and opened it up. Next day, everything was flat and true.

Talked with my son a few days later. They run a humidifier and keep their home at about 60% humidity. We don’t and here in the high plains of CO, our indoor humidity runs <10%. My son and grand kids ran into the reverse. I had made them some pull tops last year that worked fine when I gave them to them, but once they got home and the tops acclimated, they were stuck.

You may have run into the same when you brought your bench indoors.

-- Sawdust Maker

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