GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

Use of Exterior house wrap like Tyvek with XPS Insulation board

Pete Fabio | Posted in Building Code Questions on

Can a house wrap like Tyvek be used over Green Guard XPS Foam fanfold siding underlayment?

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.


  1. Tate Morgan | | #1

    Absolutely, most would recomend it. Don't tape the seams on the foam, flash all windows to the Tyvek. The other option would be to use the foam over the Tyvek as long as you flash to the home wrap.

  2. Pete Fabio | | #2

    I have a siding contractor that wants to use just the XPS over the bildrite,tape all the seams with 3" tape, flash around windows, then side with steel seamless.Is this the right way? ThankYou.

  3. GBA Editor
    Martin Holladay | | #3

    It sounds like your siding contractor intends to use the rigid foam as a WRB. That approach can work, as long as the contractor has done his or her homework and gets the details right. More information on the technique can be found here: Using Rigid Foam As a Water-Resistive Barrier.

  4. Pete Fabio | | #4

    Martin, Thanks for that link very informative I want to use the best barrier and the longest lasting.

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |