2

Our ceiling has 24" OC joists, and we are adding a mini split ceiling cassette that needs 16" OC joists.

Can I add a "partial" ceiling joist to support the mini split? That is could I add two cross braces/members and then a joist that only spans 5 feet to support the mini split? I've illustrated this in the image below.

Or, if adding a joist would it have to run the full span (20')? Or is there a better way to support the mini split?

Ceiling schematic

5
  • Is the 16" O.C for attachment screws? If so one 2x6(on its side) across the two foot space might be enough.
    – crip659
    Jan 5 at 17:32
  • Yes it's to attach the cassette to with 3 screws into each joist. Wouldn't there be some issue in the rotational force of the 2x6 on it's side?
    – r_alanb
    Jan 5 at 17:45
  • The cassettes weigh about 90 lbs
    – r_alanb
    Jan 5 at 17:55
  • What is a mini split ceiling cassette ?
    – D Duck
    Jan 6 at 9:54
  • 1
    @DDuck "what is a web search using the terms you put in italics?"
    – Ecnerwal
    Jan 6 at 14:20

1 Answer 1

8

You don't even need full 2x6 here. 2x4 properly aligned should provide adequate support. I would use the proper hangers for the joints.

2x4 joist hanger

Image source, no endorsement implied

Don't think of it as adding a joist, because it's not. You're adding framing to support the cassette, nothing more.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

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