plywood strength question

how much weight can a 1/4 inch plywood floor hold?
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On Tuesday, April 3, 2018 at 9:44:05 PM UTC-5, Virginia Brugman wrote:

I know I'm just whistling into the wind, but are you wanting to use the 1/4 inch plywood for? A 12-by-36-inch piece of 3/4-inch fir plywood can support up to 50 lbs. without problems. Plywood strength drops when thickness diminishes. For example; a 12-by-36-inch piece of 1/4-inch plywood will only support about 5 lbs. before bending.
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On 04/03/2018 08:44 PM, Virginia Brugman wrote:

How far apart are the supports? The quick answer is none.
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On 4/3/2018 10:44 PM, Virginia Brugman wrote:

Plywood over concrete can take 10,000 pounds. Over joists space 16" not enough to meet any building code.
More information needed, but I'd certainly not use wood that thin. http://homeguides.sfgate.com/size-plywood-use-subfloor-99039.html
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On Wed, 04 Apr 2018 02:44:02 GMT, Virginia Brugman
Not much. What is the span between supports?
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On 04/03/2018 10:44 PM, Virginia Brugman wrote:

Hickory plywood has a compressive strength of over 9000 psi.
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On 4/4/2018 6:28 AM, Mary Alice Winterbottom wrote:

Plywood is anisotropic and there is also tensile strength and shear strength to consider as well as the modulus. If just sitting on a flat surface like concrete compressive strength would predominate. As a beam over joints shear strength would be important.
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Impossible to know without more data.
But also, you need to refine the question.
Do you mean how much can it hold before breaking, or how much can it hold before deflection is too great to tolerate?
Most of the time you'll never get near tearing it apart, but it will bend too far to use.
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On 4/4/2018 7:24 AM, Frank wrote:

I suppose a 450 lb woman (not uncommon today) in pumps might be able to punch a heel through 1/4" plywood.
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On Wed, 4 Apr 2018 06:28:45 -0400, Mary Alice Winterbottom

Which has NO efect on how much the plywood can hold when used as a floor.
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On Wednesday, April 4, 2018 at 10:52:09 AM UTC-4, Clare Snyder wrote:

Funny how few can spot an obvious troll.
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On 4/3/18 9:44 PM, Virginia Brugman wrote:

Exactly what do you want to use it for? Plenty of people here can advise you but you need to be more specific. What kind of supports, how far apart, etc?
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