GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Audio Play Icon Headphones Icon Plus Icon Minus Icon Check Icon Print Icon Picture icon Single Arrow Icon Double Arrow Icon Hamburger Icon TV Icon Close Icon Sorted Hamburger/Search Icon

Community and Q&A

Insulating a brick wall against a stairwell

Tom Woodson | Posted in Energy Efficiency and Durability on

We just finished gutting all plaster/lath on a 1905 brick apartment and I’m trying to figure out one insulation detail:  The entry stairwell is directly against a brick wall and cannot be changed.  I have about 1.25 inches of space to work with including wall covering, so not much can be done.  The finish should be drywall and I’d like at least a small amount of insulation.

1)how to frame?  wood furring strips mechanically fastened to the brick?
2)how to insulate?  1/2 inch foil faced polyiso with very careful detailing? spray foam?

Overall insulation plan if you are curious:
climate zone 4a
-4 inches of polyiso with staggered seams above flat roof sheathing (already done)
-dense pack cellulose or fiberglass on underside of roof deck between joists (12 inches).  smart vapor barrier keeping it in.
-steel 1 5/8 inch studs offset 1 inch from the wall 1.5 – 2 inches of spray foam on all exterior walls all the way to the roof deck (except the stairs)

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 avatar GBA Editor
    Martin Holladay | | #1

    Tom,
    It sounds as if your options are: (1) Rebuild the staircase, or (2) 1/2-inch polyiso and drywall, installed with adhesive.

Log in or create an account to post an answer.

Community

Recent Questions and Replies

  • |
  • |
  • |
  • |