Examples of Where to Insulate Examples of Where to Insulate

  • In unfinished attic spaces, insulate between and over the floor joists to seal off living spaces below. *
    • 1A - Attic access door
  • 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 - Ceilings with cold spaces above;
    • 2D - Extend insulation into joist space to reduce air flows.
  • 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.
  • Floors above cold spaces, such as vented craw spaces and unheated garages. Also insulate:
    • 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.
  • Band joists.
  • Replacement or storm windows, and caulk and seal around all windows and doors.

*Well-insulated attics, crawl spaces, storage areas, and other enclosed cavities should be ventilated to prevent excess moisture build-up.

**For new construction, slab on grade insulation should be installed to the extent required by building codes, or greater.


Courtesy of the DOE

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