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plywood deflection rating Jeff D. 04-18-2008
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Posted by Jeff D. on April 18, 2008, 10:27 am
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.



Posted by Dan Espen on April 18, 2008, 9:47 am

> 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.

WOW. Only 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. I think plywood by itself
will always sag. You'd need some solid wood to get stability.

Posted by Jeff D. on April 18, 2008, 11:08 am
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'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.
>
> WOW. Only 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. I think plywood by itself
> will always sag. You'd need some solid wood to get stability.



Posted by John Gilmer on April 18, 2008, 10:43 am

> 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 ??

Yeah, that "sounds" about right.

With a 2' span, it would take 4 times the load to have the same deflection.
That's likely the way to go.



** Posted from http://www.teranews.com **

Posted by Smitty Two on April 18, 2008, 11:15 am

> > 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 ??
>
> Yeah, that "sounds" about right.
>
> With a 2' span, it would take 4 times the load to have the same deflection.
> That's likely the way to go.
>
>
>

Maybe the OP can put support the shelves one foot in from each end, with
two feet between supports. Otherwise a little piece of angle iron bolted
to the bottom of each shelf will stiffen it.

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