I am planning to build ceiling storage in garage. One side of it will be hanging from ceiling joist the other one will be attached to the wall. The joist that I am planning to use 20 ft long and consist of two 2x4 linked by metal plate, so it is not strong enough to hold 1,500 lbs of my planned weight. I am planning to reinforce it with i-joist from below and pull and old joist and new i-joist together with giant u-bolts (so ceiling's sheetrock will be sandwiched between current joist and new i-joist). For 20ft width I am planning to use i-joist 14" or 16" tall and have 7 u-bolts. I am curious if this design makes sense and strong enough? I am also concerned about my roof, which might be deformed since current joist is linked to it by 2x4s again by metal plates.

Any thoughts would be greatly appreciated. Hopefully, my explanation makes sense, I am currently learning SketchUp so that I will be able to draw proper illustration.


Generally speaking, this sort of thing is left to professional engineers. Nobody here will give you the stamp that your AHJ will require for a building permit.

Google "structural engineer" or "residential structural engineer" to find one in your area. (This assumes you're in North America... terms might vary elsewhere.

  • Where can I find professional engineer to advise me on this design? Oct 27 '16 at 0:16
  • "structural engineer" is also the term here in the UK.
    – OmarL
    Oct 8 '18 at 11:11

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.