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Old 06-11-2012, 03:15 PM   #16
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OSB or plywood of the same thickness -- what is stronger?


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Originally Posted by echobravo View Post
the weight of a man on a ladder vs the weight of a concrete wall against plywood
Your comparing a near point load of a man on a ladder, which as you said pushes about 50 lbs per leg on about 1 square inch. The weight of the concrete is distributed over the whole sheet of plywood (4608 sq inches). These are not analogous models.

Ladder vs. the Sledgehammer
This is a comparison of a low shear load vs a high shear load. Here is a good video showing how a material may behave differently under low shear vs. high shear. () BTW, latex paint behaves exactly the opposite.

All this doesn't matter the question at hand is, "Will deflection of the plywood or OSB be small enough to prevent damage to the wallboard with joists space 24" OC?" The additional question, "Is the wallboard strong enough under compression to handle the weight of the ladder without damage?" needs to be answered. We are assuming that the wallboard is not strong enough on its own to handle the weight with out deflecting enough to cause damage.

Either one, 1/2" thick, that my final answer.

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Old 06-12-2012, 12:08 PM   #17
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OSB or plywood of the same thickness -- what is stronger?


maybe you could just put bumpers on your ladder!
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Old 06-12-2012, 12:54 PM   #18
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OSB or plywood of the same thickness -- what is stronger?


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Originally Posted by goosebarry View Post
Your comparing a near point load of a man on a ladder,....
youre quoting the wrong person. i was merely showing the other person the point the other guy was making.

i wasnt comparing anything as i dont know the answer
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Old 06-12-2012, 02:36 PM   #19
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OSB or plywood of the same thickness -- what is stronger?


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Originally Posted by echobravo View Post
youre quoting the wrong person. i was merely showing the other person the point the other guy was making.

i wasnt comparing anything as i dont know the answer
My apologies!
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Old 06-13-2012, 11:47 AM   #20
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OSB or plywood of the same thickness -- what is stronger?


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My apologies!
no worries, im learning alot here
thanks for your info
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Old 06-13-2012, 04:10 PM   #21
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OSB or plywood of the same thickness -- what is stronger?


all this over a 2-foot square piece of plywood.

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