Where to Insulate

Where does a home need insulation? 1. In unfinished attic spaces, insulate between and over the floor joists to seal off living spaces below.

Where does a home need insulation? 

where do 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

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