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.
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.
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.
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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