×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

question about the TJ joist in wood apartment

question about the TJ joist in wood apartment

question about the TJ joist in wood apartment

(OP)
Normally we put all duct in bulkhead along the wall in apartment building. I know it looks ugly if the ceiling is not high, but it will comply with the fire requirement.
While sometimes the owner request to put duct in the joist space. My boss seems not willing but accepts whatever. I want to know if it is allowed or not to utilize the joist space for HVAC? If so then any method to keep the fire rate of the floor (or ceiling)?

RE: question about the TJ joist in wood apartment

You cannot use the joist space as a return air plenum.  If the ductwork is within the fire rating all penetrations should be protected with fire dampers.  You could use duct firewrap on the ductwork within the ceiling (essentially building a bulkhead around the duct with fire resistant material. Confirm fire ratings with the Architect.

RE: question about the TJ joist in wood apartment

I believe in some jurisdictions the joist bay may be wrapped with sheetrock and fire taped so there is GWB on 3 sides and open on the bottom. If the joist space doesn't end at a rated wall, you would need to have the end of the channel sheetrocked/taped. The duct would then be placed inside the sheetrock lined joist bay.
That MAY eliminate damper requirements.

RE: question about the TJ joist in wood apartment

Which is a better joist I-Beam or Truss

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources