"There were some pretty cold subzero days this past winter and the exterior walls were quite cold to the touch. I decided to investigate and rip out the "Filterglass" and replace it with foam.
I didn't want to rip all the drywall out and I didn't want to take on the task of injecting the foam into the walls. I decided to cut a 4' high section along the entire wall and then pull out the fiberglass.
I then secured the existing drywall with drywall screws near the opening which I created to ensure that the foam wouldn't push the drywall out. I then began spraying the standard non-Slow Rise foam into each wall cavity.
I didn't fill each cavity up at once because there would have been too much heat trapped inside. I went along the entire wall short filling each cavity and then going back to the first to reapply until the cavity was completely filled.
I ended up cutting a section below the window because that area was quite drafty during the winter. There was one area on the left side of the picture where I pulled out the fiberglass insulation and found dirty insulation which is indicative of air moving through it and depositing the dirt.
The problematic area was at the top of the wall cavity where there was an opening into the attic. This allowed for the warm air to escape into the attic.
All that is left is the taping, mudding and sanding. This wasn't that difficult of a project. It does require some skill but I would highly recommend it to those people who call in who want to insulate their existing walls.
By cutting out a section and filling it in, I didn't have to remove the baseboards or window trim. From a foam perspective it took about 900 board feet of material."