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

exterior insulation on home

PaulEdmonton | Posted in General Questions on

Hi guys, 
Excellent forum and great ideas, thanks! I just have a quick question that I hope someone can answer. I am a home owner who has recently been studying the benefits of exterior insulation on a home. I live in Edmonton, Canada, where the winter weather can approach -35C and would like to add a layer of exterior insulation on top of the existing stucco of the home. In particular, I have been attracted to using Rockwool Comfortboard 80 based upon excellent reviews and what appeals to me substantially is the fire resistance of this material. I was thinking about applying the 3″ comfortboard and going right over the existing stucco. Then leaving a recommended air gap and using a light weight cladding over the top for aesthetic purposes. Has anyone attempted this in the past? I see on your website that a person from southern Alberta has attempted the same project a few years ago and am curious as to his approach and if it was beneficial.
Thanks for your time, 
Paul Caines

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. Expert Member
    Michael Maines | | #1

    Paul, I have not insulated over existing cladding but it could work. The tricky parts would be to provide continuous control layers for water and air. Not a problem in the middle of the wall, but how will you tie into windows, doors, roofs, etc.. If you haven't already, you should read this article:

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |