Before you Insulate
The Best Test......the rest guess!
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.

What's in your walls?


  • 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


A home energy audit will help take the confusion out of improving your homes energy efficiency.






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