Could you please tell me how you build headers for closet bi-fold doors that are 6'0" wide on non-bearing walls? Do you just build them out of 2x4's?
A non-bearing wall doesn't need a header, as such. You only need a single horizontal plate with studs up to the top plate. Here is a drawing to clarify:
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Remember that the opening for your bi-fold is 6'-0" x 6'-8" finished, that is including drywall.