Strong or Weak Direction of Sheathing
Strong or Weak Direction of Sheathing
(OP)
Is there a strong direction and a weak direction of plywood? In other words, is it important to lay the 8 foot direction across the purlins as opposed to the 4 foot direction?
Is there a strong direction and a weak direction of OSB?
Is there a strong direction and a weak direction of OSB?





RE: Strong or Weak Direction of Sheathing
RE: Strong or Weak Direction of Sheathing
For unblocked diaphragms, there is a reduction in lateral capacity. Also see same table.
IBC must have similar table with diaphragm shear capacities.
RE: Strong or Weak Direction of Sheathing
There is more to it than this, but the bottom line is you are correct, having the plywood face grain (8 ft length) cross the purlin is significantly stronger (say 50% or so stronger) than the other orientation. Plywood thickness, wood species, number of layers, etc. all effect the exact improvement.
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RE: Strong or Weak Direction of Sheathing
What about OSB? Is it stronger in one direction or is it the same strength in each direction? What about stiffness? Is it the same in each direction?
RE: Strong or Weak Direction of Sheathing
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and another link for OSB
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