Is this true?

[radstorm]

Hi all, was not sure where to put this as I don't see a carpenter section per say. Anyways, I bought some 4x8 plywood and the guy said not to store it on it's edge, but lay it flat or it will warp. Is this true? I am storing it indoors and will be using it within the next 30 days, and of course laying it flat would not be an option due to space. I am sure if I stored it for years maybe warping might happen, but for just a short time?

[pushkins]

For just 30 days stored indoors you should be fine, try not to store it leaning on an angle against a wall with other things leaning against it. Stand it as upright as you can.

[manhattan42]

Hi all, was not sure where to put this as I don't see a carpenter section per say. Anyways, I bought some 4x8 plywood and the guy said not to store it on it's edge, but lay it flat or it will warp. Is this true? I am storing it indoors and will be using it within the next 30 days, and of course laying it flat would not be an option due to space. I am sure if I stored it for years maybe warping might happen, but for just a short time?

What you have been told is true.

NEVER store plywood on edge for more than a day...

ALWAYS store plywood flat supported on at least 16" centers even overnight.

Daily changes in temperature and humidity can easily warp plywood rendering it all but useless...

[pushkins]

See there ya go, ask the same question and get two totally different answers
I never said you "should" store it that way but that you "could" if careful, very few people have the space to store a 4x8 sheet flat for any given period of time.
Can you cut it down to the required size ? how many ply is it ?

[radstorm]

Yeah manhattan42, I was afraid someone would say that ,, Exactly pushkins..no space to lay it down flat I will be attaching it to studs, so I am hoping once I screw it down..it will pull whatever warping back out anyways. By the way..what would be a good glue to adhere plywood to osb? I want to make a thin door for a utility closet.

[pushkins]

As your making a door you will most definitely want to keep it as straight as possible, you'll be gluing it down an that is much different than screwing or nailing it down.
A contact adhesive is your best bet for gluing the ply to osb.

As a footnote OSB is very easily warped unless it is attached to studs etc... if this is indoors or in a very protected area you might want to look at MDF (hate that stuff personally) paint all edges, or use a better quality board like Advantech.