×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Dual vapor barrier wall assembly

Dual vapor barrier wall assembly

Dual vapor barrier wall assembly

(OP)
I have a home where the walls are constructed as follows from the inside out: gypsum board, plastic sheeting, 2x4 studs with blown in cellulose insulation, asphalt impregnated fiberboard exterior sheathing with Masonite siding. The homeowner wants to remove the Masonite siding, repair any damaged fiberboard sheathing, add a layer of OSB sheathing with a moisture barrier, and install new vinyl siding. The addition of the OSB sheathing is because he doesn't like the idea that someone can literally cut their way into his home with a box cutter which I don't blame him. If we remove the fiberboard sheathing then replacement of the the insulation would be required as well as the blown in cellulose is retained inside the wall cavity by the fiberboard sheathing and the plastic sheeting on the inside of the wall. I am worried that if we add the OSB sheathing with an additional moisture barrier on the exterior of the wall assembly we could get moisture issues within the wall cavities but I also don't like the idea of not adding a moisture barrier behind vinyl siding either. The homeowner resides in Charlotte, NC which experiences relatively mild winters and warm humid summers. I was curious to everyone's thought on whether the new proposed wall assembly consisting of gypsum, plastic sheeting, 2x4 studs with blown in cellulose, fiberboard sheathing, OSB sheathing, moisture barrier, and vinyl siding would present any potential for trapping moisture in the wall cavity? If so what if anything could be done to mitigate the potential for this to occur?

RE: Dual vapor barrier wall assembly

Ideally we don't double post around these parts. See my response to your query in the structural engineering forum.

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