WHERE TO INSULATE YOUR HOME:
Examples of where to insulate. 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.
For optimal energy efficiency, your home should be properly insulated from the roof down to its foundation. In addition to insulation, consider moisture and air leakage control in each area of your house. If radon is an issue where you live, youâll also need to consider radon and radon-resistant construction techniques as you research foundation insulation options. In addition, if you live in an area with termites, youâll have to consider how termite protection will affect the choice and placement of insulation in your home.
Closed-cell and open-cell spray foam. These are the two kinds of spray-foam insulation. Open-cell SPF is the lighter, less dense option; it is the cheaper of the two but has less insulating power (or a lower R-value). Closed-cell SPF is denser and more expensive, can provide a bit more rigid support to certain structures and can act as a water vapor barrier, because it is less permeable.
REFERENCE: https://energy.gov/energysaver/where-insulate-home & Houzz.com member
Robert Anderson - Owner