Video: Do CI and WRBs Go Together?

Originally published by the following source: Applied Building Technology GroupMarch 13, 2019
by Timothy Ahrenholz


Last time we talked about integrating continuous insulation with a tarpaper WRB.  However, nowadays it’s common to see other kinds of WRBs on commercial products such as peel-and-stick, fully self-adhered membranes, spray applied membranes, and so forth. 

Can you put continuous insulation over these types of WRBs?  Forgive us for sounding like a broken record, but the answer is “of course!”  In fact, continuous insulation is compatible with pretty much any WRB system, and in some cases can function as its own WRB (when properly installed, taped and sealed).  For more information and guidance, visit the WRB page on and check out the short video below:

For additional information, please review the following articles, as well as the previous videos in this series:

Perfect Wall Articles

  1. Creating the ‘Perfect Wall’: Simplifying Water Vapor Retarder Requirements to Control Moisture
  2. Perfect Walls are Perfect, and Hybrid Walls Perfectly Good
  3. Wood Framed Wall Insulation Calculator Explained
  4. New Wall Design Calculator for Commercial Energy Code Compliance
  5. Energy Code Math Lesson: Why an R-25 Wall is Not Equal to a R-20+5ci
  6. Continuous Insulation Solves Energy Code Math Problem

Video Series

  1. Fear Building Envelopes No More with This Website & Videos
  2. Thermodynamics Simplified Heat Flows from Warm to Cold
  3. Moisture Flow Drives Water Induced Problems
  4. Video: How the 'Perfect Wall' Solves Environmental Diversity
  5. Video: How Important Is Your WRB?
  6. Video: A Reliably Perfect Wall Anywhere
  7. Video: The Best Wall We Know How to Make 
  8. Video: How to Insulate with Steel Studs
  9. Video: Thermal Bridging and Steel Studs
  10. Video: Better Residential Energy Performance with Continuous Insulation
  11. Video: How to (Not) Ruin a Perfectly Good Wall
  12. Video: Tar Paper and Continuous Insulation? No Problem!
  13. Video: Do CI and WRBs Go Together?
  14. Video: Assess Your 'Perfect Wall' Using Control Layers