GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter X 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

Basement insulation stack

FredJP | Posted in General Questions on

Im going to finish my basement. I’m located in zone 5A. Contractor wants to install a 2.5” steel stud wall 16” OC 1” away from solid cinderblock wall. Cavities filled with r15 fiberglass batts. 

1. Should I recommend he swap the airgap for 1.5” XPS R7.5 leaving it 6” off the ground?

2. Do I need to insulate the cinderblock wall and rim joist behind an attached, unheated garage? If so, R15 continuous same as the other walls?

3. I currently have fiberglass batts insulating my rim joist. Should I replace with spray foam?

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.

Related Questions

Replies

  1. Malcolm_Taylor | | #1

    Fred,

    You may find this useful: https://www.greenbuildingadvisor.com/article/how-to-insulate-a-basement-wall

Log in or create an account to post an answer.

Community

Recent Questions and Replies

  • |

  • |

  • |

  • |
View More Ask a Question

Featured Blogs

Musings of an Energy Nerd View More

Contemplating residential energy use

Product Guide View More

Double Check

Do you really want to delete the list, ?

Note

This won't delete the articles you've saved, just the list.

This feature has been temporarily disabled during the beta site preview.

You must be a magazine subscriber to access this feature.

Subscribe today and save up to 44%

Subscribe

Or learn more

Already a subscriber?