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A structural engineer gave me a header design using beams made from LVL 1.9. Looking around, I'm seeing more LVL 2.0 available locally. What is the difference?

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LVL is laminated veneer lumber. The numbers 1.9 and 2.0 refer to the Modulus of Elasticity which is a measure of the stiffness of the beam. I would seriously doubt that there is any meaningful difference between 1.9 and 2.0 rated beams.

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You could believe 1.9e and 2.0e is meaningless right up to the point that your building inspector shuts down your job.
Best practice-- ask your inspector.

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