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Old 10-10-2007, 12:10 AM   #1
PoorOwner
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Default What is the compressive strength of plywood?

I was wondering, if you put plywood (1/2" or thicker) under jackstands, jacks etc can it handle the load?

Can you use plywood between jack and the chassis instead of a block of 2x4?

What happens when it fails?
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Old 10-10-2007, 02:39 AM   #2
Franz©
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Default Re: What is the compressive strength of plywood?

The answer depends on the type of plywood.
In today's lumber market there are even good and crap 2x4s

When it fails, it generally fails slowly, and you'll notice the effect of the compression. Jackstands generally have a very small footprint, and exert a lot of pressure per square inch. A piece of 1/8 sheetmetal between the plywood and jackstand would prevent the legs from imprinting and crushing the plywood.
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Old 10-10-2007, 09:08 AM   #3
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Default Re: What is the compressive strength of plywood?

i would say that comparable sizes the plywood would be stronger. for the simple fact that a 1x4 or a 1x6 would split alot easier than 1" thick plywood. just my 0.2 cents.

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Old 10-10-2007, 01:21 PM   #4
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Default Re: What is the compressive strength of plywood?

I do it all the time when useing jackstands on an asphalt drivway.
Heavyest thing was a Grand Cherokee.
Use real 1/2 or 3/4 PLYWOOD, not OSB! The OSB will come apart on you when the sharp edges dig into it.
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Old 10-10-2007, 01:26 PM   #5
PoorOwner
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Default Re: What is the compressive strength of plywood?

OK, does it matter if the plywood face is pine or oak? Oak face are pretty and preferred to make cabinets but is it like the real wood where oak is stronger than pine.
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Old 10-10-2007, 01:47 PM   #6
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Default Re: What is the compressive strength of plywood?

Quote:
Originally Posted by PoorOwner View Post
OK, does it matter if the plywood face is pine or oak? Oak face are pretty and preferred to make cabinets but is it like the real wood where oak is stronger than pine.
Well other than the face veneer the oak plywood is not likely to be oak. And at the thickness of the face veneers I have seen lately I don't think your going to get much additional strength out of it.

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Old 10-10-2007, 04:02 PM   #7
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Default Re: What is the compressive strength of plywood?

For that get the cheapest grade of real plywood you can. The difference is in the quality of finish, no football looking patches are allowed on the better grades but for what you are doing a C-D grade plywood is the ticket. Face veniers are 1/32" to 1/48" so no strength there. Jackstands will dent into it unless you put metal or similar to spread the load out between the jackstand & the plywood.
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