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

Insulating and Air-Sealing Around Windows

jamesboris | Posted in Green Building Techniques on

New build in Zone 2A w/flanged windows. When I’ve installed windows before, I used canned foam on the interior gap (between the opening and the window). This time, I want to try something that I think will be better: Rockwool in the cavity + Air Dam or tape to seal it. 2 questions:

1) I’ve used canned foam before, but with that, you must avoid filling the entire cavity (which creates a moisture trap). Would it be okay to jam-pack the entire cavity with Rockwool, long as I leave space for backer rod + Air Dam? I’ve never used it before.

2) Anyone with experience or tips on using “zero reveal” air sealing tapes like Tescon Profil, or Solido IQ-D? I like the idea, but I wonder how well stuff like these “bunny ears” work in the field… https://youtu.be/GcbtPxRFzsY?t=271. Also, I’m having trouble thinking of a way to do this with windows that will get a stool and apron.

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.

Replies

  1. user-36575 | | #1

    WRT 1), mineral wool is air permeable and doesn't swell, so filling the cavity up to the backer rod should be okay. I doubt that you need to "jam-pack" the cavity with mineral wool like we used to with fiberglass. Just filled with a good friction fit should be fine.

Log in or create an account to post an answer.

Community

Recent Questions and Replies

  • |
  • |
  • |
  • |