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

Steico Universal Dry versus Rockwool Comfortboard

user-7022518 | Posted in Energy Efficiency and Durability on

Can people weigh in on 2″ Steico Universal Dry (R6.15) versus 2″ Rockwool Comfortboard (R 8) for exterior insulation? There is a good source for the Steico close by and it is less expensive. We are building in Virginia so our winters are not as tough as up north so losing 2 R is doable. The Rockwool has better fire performance but the installation of the Steico is appealing with a simple tongue in groove board system that can stack up quickly. I am leaning toward the Rockwool because of our humidity and critters but I am trying to stay open to a wood fiber product. If anyone has taken a drive in West Virginia you will see signs objecting to the environmental damage of rockwool. 


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

    Slightly better performance with Rockwool, and it's fireproof. Much lower embodied carbon in the Steico--depending on some variables, it may be even be carbon negative. It's also significantly easier to work with than Comfortboard. Unless you're in a high fire danger area, I would go with the Steico.

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |