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

insulating a tight attic space under a flat roof

dborowsk | Posted in General Questions on

Looking for advice on how to insulate a small 12″-24″ high attic space under a flat roof.  It’s existing and we’re looking to do it without tearing up the roof above or the ceiling below.   

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.


  1. plumb_bob | | #1

    Where are you at? How much insulation is required? Will there be a ventilation space above the insulation? Vented soffits or?Rafters? Trusses?

    Without access from above or below you are going to be hard pressed/unable to do an effective insulating job, especially on sections with 12" clearance. If you can find somebody to worm around in the sections with 24" clearance you can either blow in loose insulation, or use batts. The 12" sections seem like an impossible task. The challenge is getting the insulation into the areas in needs to be in the proper manner, and keeping it out of the areas it should not be.

    Maybe somebody smarter has a solution?

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |