Closed cell foam, also called high-density foam, is impermeable to water vapor, making it a good choice for unvented attics or crawl spaces. All three systems can easily be adapted to match a specific R-value design target. Regardless of the material, dense-pack must be installed at the proper density (3.5 pounds per cubic foot) to avoid settling and it should be protected from moisture with an effective moisture barrier. In addition to reducing heating costs, a properly insulated foundation will keep below-grade rooms more comfortable and prevent moisture problems, insect infestation, and radon infiltration. Insulated Slab: Slab-on-grade floors tend to have fewer air leaks than wood-frame floors, although plumbing penetrations must be sealed. Typical … In addition to insulation, consider moisture and air leakage control in each area of your house. Check Out Our Free Zero Energy Newsletter, Appraisal and Mortgage Strategies for Zero Homes, Twelve Steps to Affordable Zero Energy Home Design and Construction, Zero Energy Home Conference and Course Calendar, Builder Subsidies, Incentives, and Tax Credits, Net Zero Home Sales and Appraiser Courses Online, Financing Renewable Energy and Energy Efficiency Upgrades for Existing Homes. to optimize the insulation value for various climates. Many people are concerned that supporting drywall and sheathing on 24” centers. Porch beams should be attached to the exterior sheathing as opposed to being secured deep inside the wall. It’s best to use dense-pack insulation for greater R-value and to prevent insulation settling in roof pitches of 3-in-12 or greater. Depending on design requirements, it may be possible to insulate the floor above the basement and declare this lower space unconditioned. Care should be taken to install the same thickness of insulation around the perimeter where heat loss is greatest. Keep your finger on the Pulse of what is happening in the Net Zero and Green Building Scene. Single Plate, Double Stud Wall: Use a 2×8 or 2×10 plate with 2×4 studs aligned to alternate faces of plate to create a staggered stud layout. Floors above cold spaces, such as vented crawl spaces and unheated garages. 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. Interior basement wall insulation has the following advantages: It is much less expensive to install than exterior insulation for existing buildings. Spray foams that use blowing agents based on hydrofluorocarbons (HFCs)  have severe  negative global warming and environmental impact. Floors above cold spaces, such as vented crawl spaces and unheated garages. In a similar way, the thickness of exterior rigid insulation can be increased to reach the desired insulation value. Most builders choose to carefully seal the perimeter of each floor sheet with construction adhesive. It’s best to use dense-pack insulation for greater R-value and to prevent insulation settling in roof pitches of 3-in-12 or greater. A second layer of roof sheathing and roofing material caps the assembly. Another option – and a generally less expensive one – would be I-joist rafters. Perhaps the best performing arrangement is adding a four- to six-inch layer of low-GWP rigid insulation to the roof deck. Some projects bring the entire attic into the thermal boundary by insulating the roof. Newer hydrofluoroolefins (HFO) blowing agents address the greenhouse gas issue but have not yet been widely adopted.
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