New answers tagged structural
If it's a load bearing wall (seems likely), you need an engineer.
I agree with Tester101's comment. The current "header" in each closet opening appears to be just one flat 2x4. You will want to install a pair of 2xX framing members on edge that can span the total new opening width without sagging. The ends of this should sit on top of the jack studs at the sides of the opening. A convenient way to make this header ...
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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