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Plywood or MDF warping when stored?

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Forum topic by Brett posted 02-09-2011 04:30 AM 2781 views 1 time favorited 8 replies Add to Favorites Watch
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Brett

660 posts in 2149 days


02-09-2011 04:30 AM

Will a sheet of plywood or MDF warp if I store it on edge for a few weeks or months?

-- More tools, fewer machines.


8 replies so far

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Dabcan

252 posts in 2137 days


#1 posted 02-09-2011 04:47 AM

I had some half inch mdf that was stored on end, it definitely warped, but it flattened out from it’s own weight afterblaying flat.

-- @craftcollectif , http://www.craftcollective.ca, https://www.etsy.com/shop/craftcollective?

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thiel

374 posts in 2758 days


#2 posted 02-09-2011 05:04 AM

Yes. You can minimize the warping though by keeping the sheet as flat and vertical as possible (e.g. put it against the wall, and then push some stuff up against it).

-- Laziness minus Apathy equals Efficiency

View lilredweldingrod's profile

lilredweldingrod

2495 posts in 2573 days


#3 posted 02-09-2011 05:07 AM

I’ve had mixed results. The Chinese crap definitely will warp, curl, and separate. but if you set domestic ply and MDF on 2×4 pieces to keep them off the concrete floor and I clamp mine to a large shelf that I store 5 gallon water jugs and liquid nutrition cases on for my disabled son. This works very well for me. I have sheets of 19mm ply that have been in this rack for over a year now and no problems.

You can see my system in my shop photos. Look just to the right of the TS.

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spamfilterman

149 posts in 2488 days


#4 posted 02-09-2011 05:22 AM

I have definitely had plywood warp when standing it on edge in the garage. It was a major pain to deal with afterwards.

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Sawkerf

1730 posts in 2535 days


#5 posted 02-09-2011 05:31 AM

I don’t have the room to set up ideal storage, so I have to lean sheet goods (and lumber) against the walls. The more vertical I keep it, the less it warps, and flipping it periodically seems to straighten it out again.

-- Adversity doesn't build character...................it reveals it.

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wseand

2754 posts in 2508 days


#6 posted 02-09-2011 06:50 AM

If you have some 2x and can make some sort of holder for it that would be the best. Keep it as vertical as possible and I clamp a few pieces together to give it a little more stability. Make sure you give it good stability so it cant sag, support it well, and you should get good results.

-- Bill - "Freedom flies in your heart like an Eagle" Audie Murphy

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Dez

1162 posts in 3544 days


#7 posted 02-16-2011 10:24 PM

Yup! That is why commercial shops use flat storage systems.

-- Folly ever comes cloaked in opportunity!

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Loren

8313 posts in 3114 days


#8 posted 02-16-2011 11:14 PM

Often it will warp. It is not 100% certain it will but do plan for it. I saw a
design somewhere for a system that clamped sheet goods stored on edge flat. It’s usually warping on the 4’ side that causes problems so clamping the long
dimension is not as crucial to avoid warpage.

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