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plywood deflection rating

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plywood deflection rating Jeff D. 04-18-2008
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Posted by Matt W. Barrow on April 18, 2008, 3:52 pm

> Not an expert on load tables but from what I can understand 3/4" at 4ft
> between supports would only be good for about 30lbs ??
>

I have a work bench made with 3/4" plywood doubled over and supported by
metal legs five feet apart.

On top of that bench I have two machine presses that weight about 50-60 lbs
each and using them creates a hell of a lot of additional downward pressure.

It's been going fine for thirty years with zero problems.



Posted by hr(bob) hofmann@att.net on April 18, 2008, 12:42 pm
wrote:
> > I'm building a wall of storage shelving for my 45 record collection (app=
x.
> > 20,000). The records are stored 200/box and each box is 16x8x9, weighing=

> > 15lbs. Will 3/4" plywood shelving 4 feet long support this load without
> > deflecting, each shelve will be loaded to 75lbs with supports on the end=
s
> > only.
>
> WOW. =A0Only about 350 45s here.
> I recently finished transcribing them to disk and burning them to CDs.
>
> Same with the Vinyl LPs.
>
> I haven't done it yet, but I think I'm going to just toss them now.
>
> I'd have to guess about the shelving. =A0 I think plywood by itself
> will always sag. =A0You'd need some solid wood to get stability.

Some thin metal mounted vertically between the boxes would be a good
idea, 4foot is too long a spread to not get a little sagging. Try
your scheme, and if there is too much sagging for your taste, a thin
aluminum plate would easily fit between a couple of boxes and prevent
the sagging.

Posted by Rick Samuel on April 21, 2008, 11:56 pm
>
> Same with the Vinyl LPs.
>
> I haven't done it yet, but I think I'm going to just toss them now.

Toss them??? As in garbage?? Sell em, donate to your church garage sale,
Goodwill, anything.



Posted by Dan Espen on April 22, 2008, 7:15 pm

>>
>> Same with the Vinyl LPs.
>>
>> I haven't done it yet, but I think I'm going to just toss them now.
>
> Toss them??? As in garbage?? Sell em, donate to your church garage sale,
> Goodwill, anything.

I doubt they have any value.
They've all been played a lot.
The 45s lack the original sleeves.

Despite the condition, I was able to clean up the recordings I made,
sometimes quite well.

Posted by jloomis on April 18, 2008, 10:03 am
They may sag, and I would provide a strongback along the front
edege......You will be amazed how much this helps with rigidity. Strongback
like a 1x2 or 1x3.....
I also dado the shelves and glue into the sides and make sure to cleat or
nail the back.
Glue all members.....
jloomis
> I'm building a wall of storage shelving for my 45 record collection (appx.
> 20,000). The records are stored 200/box and each box is 16x8x9, weighing
> 15lbs. Will 3/4" plywood shelving 4 feet long support this load without
> deflecting, each shelve will be loaded to 75lbs with supports on the ends
> only.
>



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