Where does a home need insulation?
1. In unfinished attic spaces, insulate between and over the floor joists to seal off living spaces below.
- 1A attic access door
2. In finished attic rooms with or without dormer, insulate
- 2A between the studs of “knee” walls
- 2B between the studs and rafters of exterior walls and roof
- 2C and ceilings with cold spaces above
- 2D Extend insulation into joist space to reduce air flows.
3. All exterior walls, including
- 3A walls between living spaces and unheated garages, shed roofs, or storage areas
- 3B foundation walls above ground level
- 3C foundation walls in heated basements, full wall either interior or exterior
4. Floors above cold spaces, such as vented crawl spaces and unheated garages
- 4A any portion of the floor in a room that is cantilevered beyond the exterior wall below
- 4B slab floors built directly on the ground
- 4C as an alternative to floor insulation, foundation walls of unvented crawl spaces
- 4D Extend insulation into joist space to reduce air flows
5. Band joists
6. Replacement or storm windows and caulk and seal around all windows and doors
Source: Oak Ridge National Laboratory
