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Old February 13th 20, 10:55 PM posted to rec.woodworking
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Default Wide shelving advice needed

On 2/13/2020 3:33 PM, Leon wrote:
....

Actually the addition of adhesives between ply's, a necessary component,
makes plywood stronger.


More rigid...

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Old February 13th 20, 11:45 PM posted to rec.woodworking
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Default Wide shelving advice needed

On Thursday, February 13, 2020 at 1:54:56 PM UTC-8, Clare Snyder wrote:

Even a unidirectional laminated wood is stronger than "solid" wood if
properly designed and implemented (with the layers alternated "cup up"
to "cup down") and is also more dimensionaly stable than "solid wood"
as it resists warpage pretty effectively.


But for a pantry shelf (18 x 30 inches) dimensional stability and warping/cupping aren't
a big problem. If you trap the edges in dadoes, warping is nil. If the face of the shelf
is pinned (or hidden by a face frame) the shelf can change depth; who'd notice?
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Old February 14th 20, 02:52 PM posted to rec.woodworking
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Default Wide shelving advice needed

On 2/13/2020 5:45 PM, whit3rd wrote:
On Thursday, February 13, 2020 at 1:54:56 PM UTC-8, Clare Snyder wrote:

Even a unidirectional laminated wood is stronger than "solid" wood if
properly designed and implemented (with the layers alternated "cup up"
to "cup down") and is also more dimensionaly stable than "solid wood"
as it resists warpage pretty effectively.


But for a pantry shelf (18 x 30 inches) dimensional stability and warping/cupping aren't
a big problem. If you trap the edges in dadoes, warping is nil. If the face of the shelf
is pinned (or hidden by a face frame) the shelf can change depth; who'd notice?


Agreed
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Old February 15th 20, 03:26 PM posted to rec.woodworking
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Default Wide shelving advice needed

On 2/13/2020 9:36 AM, Leon wrote:
....

Again, I'm not saying plywood will sag less than solid wood when used
for shelving, I'm saying that plywood is stronger than like sized wood.


It's far more stable and the likelihood of splitting along the grain
(since there isn't any grain throughout) is insignificant in comparison,
yes. That's not "strength" per se, though.

http://charlespetersonflooring.com/wp-content/uploads/2014/04/chapter_12.pdf

Doug fir ply has MOR (modulus of rupture) of about 5-6 kpsi whereas
clear Doug-fir (12% moisture) is more like 12 kpsi.

As noted in the text for MOR the value is the accepted measurement but
the computation from measurements is based on limits of elastic region
and specimens will be/are deformed beyond such before they actually fail.

All not to deny that ply is a most suitable alternative for shelving;
particularly wide shelving than single wide board solid material, only
to be more precise in what it is that is measured/calculated...

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