When insulating your home,
you can choose from many types of insulation.
To choose the best type of insulation, you should first determine the following:
The recommended R-values for areas you want to insulate.
An insulating material’s resistance to conductive heat flow is measured or rated in terms of its thermal resistance or R-value -- the higher the R-value, the greater the insulating effectiveness. The R-value depends on the type of insulation, its thickness, and its density. When calculating the R-value of a multilayered installation, add the R-values of the individual layers. Installing more insulation in your home increases the R-value and the resistance to heat flow. To determine how much insulation you need for your climate, give us a call.
Where you want or need to install/add insulation
- 1. In unfinished attic spaces, insulate between and over the floor joists to seal off living spaces below. If the air distribution is in the attic space, then consider insulating the rafters to move the distribution into the conditioned space.
- (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. 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.
- 5. Band joists.
- 6. Replacement or storm windows and caulk and seal around all windows and doors.
- Source: Oak Ridge National Laboratory