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Situtation & Context

Plan to hand a bookcase on a barn door in front of this opening. It will open in front of a sliding door that has a vertical blind that sits ~4.25" from drywall face.

To do this I need to sister/build out a "beam" that is 14' long from wall to wall that can support the material and the bookcase.

questions at end

fourteen foot span

Idea

  1. remove drywall in front of headers (fireplace & slider)
  2. reinforce/fill in the fireplace headers with more supports

enter image description here

  1. I need 5" to create enough overhang in front of the sliding doors blind

    • I will countersink 6" Grade 5 Lag Bolts &

    • Use strap iron or twist straps to attach the layers to ceiling joists (24" on center)

      • I have 3/4" strap iron, I'm considering wrapping each of the layers if I can figure how to hold them tight to the ceiling.
    • layer:

      • two 2x6 kiln-dried pine + 1.75 LVL engineered beam + then a TBD veneer (likely rough-cut 4x8x3/4 sheet of fir)
    • Additionally, instead, of lag bolts, I'll likely use full bolt & nuts w/ washers to the fireplace 2x10 header

in the picture below none of these materials are what will be used but were scraps I had to at hand to show the layering idea... two 2x6 + 1.75 LVL + 3/4 sheet not to scale or actual materials

Questions

  1. Number of lag bolts to go across the 14' expanse?
    • I figured two every two feet with ~8" between them vertically.
  2. size of lag bolts? 6" grade 5, but... 1/4" or 3/8"
  3. examples of how to strap a beam tight to trusses in the ceiling?
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    "How much can hardware to manage for cantilever load & sheer weight on a built out faux beam that will support barn door bookcase?" i can not wrap my head around that question/statement. If i understand your project correctly, you want to put a bookshelf on a barn door, all of the weight of the books will be on the barn door hardware. correct? – Alaska Man Mar 5 at 5:52
  • A) A drawing (even if a rough pencil sketch with dimensions) of what you're proposing would be very helpful. B) How much do you expect this to weigh? C) Are you 100% committed to this or are you open to options that may make your life easier? – FreeMan Mar 5 at 12:56

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