×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

*
*
*
*

Thanks. We have received your request and will respond promptly.

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!
*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

Duct penetration through ribbed metal deck roof?
3

thread1043-184888

Duct penetration through ribbed metal deck roof?

Duct penetration through ribbed metal deck roof?

(OP)
I need to run a 24" square duct through a ribbed metal roof to an exhaust fan. I want to achieve a watertight, silent finished product. Does anyone know where I could find a section view that would show the proper way to flash this penetration?

RE: Duct penetration through ribbed metal deck roof?

(OP)
Oh yeah, one other thing the roof is sloped.

RE: Duct penetration through ribbed metal deck roof?

SMACNA hand book, Duct construction standards.
B.E.

RE: Duct penetration through ribbed metal deck roof?

(OP)
Thanks berkshire. Got a web address for that?

RE: Duct penetration through ribbed metal deck roof?

You need to find a local curb fabricator. Your sheetmetal contactor should measure the pattern of standing seam. The curb will be built with the reverse pattern to match the roof. The roofing contractor he should be able to tell you the panel manufacture and they may have standard details like the size of the cricket on the high side. http://www.rpscurbs.com/catalogstart.htm

RE: Duct penetration through ribbed metal deck roof?

(OP)
I am really grateful for y'alls feedback. what about this scenario? I match the flashing to the roof like suggested then install flashing and caulk with geocell 2300 then put a layer of epdm around it. Also, if the flashing goes under the roof on the up side does it go over the roof on the down side?

RE: Duct penetration through ribbed metal deck roof?

mahalo (Structural)
The item you are referring to as flashing  should be part of your roof jack or curb. And yes it should go under on the upward side and over on the downward side.
 You need to consult with an architectural sheet metal shop, or a roofing specialist.
B.E.

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! Already a Member? Login

Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now
Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close