Contact US

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

Through-Wall Flashing Necessary for Rain Screen Panel system?

Through-Wall Flashing Necessary for Rain Screen Panel system?

Through-Wall Flashing Necessary for Rain Screen Panel system?



I am currently in a process of designing a rain screen panel system that will utilize a stand-off clip and girt to hold the panels. The panels will sit approx 3 -5"(depending on the thickness of
esterior insulation) proud of substrate.
I am wondering if through-wall flashing is necessary for such a system. The image attached is a detail in -progress that I am working on and it shows a deflection joint where two girts are separated by approx 1 " to allow for deflection
of the slabs. I am wondering if I need to incorporate thru wall flashing at this deflection joint or anywhere else along the vertical line of the wall?

I figure I would not need a through-wall flashing since the joints of the panels will deflect almost all the rain away, but, if any wind-driven rain shall find its way through
the panel joints then there are many drainage planes where this residual water can ran down from ( back side of panels, girt top planes, sides etc). In addition, the
volume of the air space would provide ample ventilation that would further dry out any residual moisture.
My only concern is would a through -wall flashing be needed if the panels are to be used on high rise building and sky scrapers of many floors where sum total of all residual water that
was able to get behind the panels at each floor would needed to be drained at every floor?
What are your thought on this?


I would greatly appreciate any feedback.


RE: Through-Wall Flashing Necessary for Rain Screen Panel system?

Yes! A through-wall flashing is absolutely necessary.

RE: Through-Wall Flashing Necessary for Rain Screen Panel system?

Thanks for the quick response Ron. Appreciate it. The main reason I was wondering whether trough-wall flashing was required is after looking at on route and return panel systems like Alucabond, Trespa and contacting Alucabond representatives, they told me that route and return systems don't use through wall flashing, instead, they use weep holes at every panel.
So does this mean that if I don't integrate a through wall flashing, the weep holes would suffice?


RE: Through-Wall Flashing Necessary for Rain Screen Panel system?

No. Alucobond and other similar panels will collect moisture within the cavity, with only drain holes in the alucobond panels, you cannot reasonably remove such moisture. Provide a thru-wall flashing that removes accumulated moisture without the need for drilling drainage holes in the Alucobond panels.

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


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