I have a currently unfinished basement in a rather new home. There are a few places that have bay windows, or cantilevers that currently have only a bit of pink insulation thrown in fro the basement. From what I can tell, the wall up there, plus the floor (sill box) are the part that is outside the house exposed to the elements.

At first, I was thinking of putting some XPS foam along the top, bottom, and the inside wall and stuffing it with some insulation and sealing it. But then I read this article: What material should I use to insulate floor over a bumpout? which seems to indicate that I don't want to completely seal it, but instead just insulate the bottom and wall area.

What do you think?

Also, I plan on eventually finishing the basement and using spray foam as insulation. So anything I do now, I'd want to be able to know that I could remove if needed.

  • I'd say mohlsen's answer to the question you linked to, answers your question.
    – Tester101
    Jan 22 '15 at 11:22
  • Yeah, I just wonder why everyone else seems to suggest closing it off completely. Anyway, what should I use to stick the xps sheets in? Tape? Foam along seam?
    – NinjaCat
    Jan 22 '15 at 15:28

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