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A floor cavity between the first and second floor can provide a conditioned space for HVAC ducts if the rim joists are insulated and air sealed, if sufficient space is available, and if open-web floor joists are used

A floor cavity between the first and second floor can provide a conditioned space for HVAC ducts if the rim joists are insulated and air sealed, if sufficient space is available, and if open-web floor joists are used
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A low-sloped shed roof with the thermal boundary located at either a) the flat ceiling with a vented attic or b) the roof line for an unvented attic

A low-sloped shed roof with the thermal boundary located at either a) the flat ceiling with a vented attic or b) the roof line for an unvented attic
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A simple vented attic with good air-sealing of the drywall ceiling air barrier, air flow from soffit vents to ridge vents protected by ventilation baffles, and lots of insulation covering the attic floor is unlikely to encourage ice dams.

A simple vented attic with good air-sealing of the drywall ceiling air barrier, air flow from soffit vents to ridge vents protected by ventilation baffles, and lots of insulation covering the attic floor is unlikely to encourage ice dams.
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A site-built rafter roof with a raised top plate allows for more insulation underneath.

A site-built rafter roof with a raised top plate allows for more insulation underneath.
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A standard site-built roof of rafters may pinch the insulation at the eaves

A standard site-built roof of rafters may pinch the insulation at the eaves
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A typical Las Vegas hot-dry climate home made of wood frame construction and insulated with R-25 expanded polystyrene externally over a drainage plane, with an unvented wood frame insulated attic and roof assembly.

A typical Las Vegas hot-dry climate home made of wood frame construction and insulated with R-25 expanded polystyrene externally over a drainage plane, with an unvented wood frame insulated attic and roof assembly.
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Above the 20 inches of blown cellulose ultra-efficient attic insulation, Near Zero Maine installed a walkway in the attic to provide easy access to electric wiring.

Above the 20 inches of blown cellulose ultra-efficient attic insulation, Near Zero Maine installed a walkway in the attic to provide easy access to electric wiring.
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Addison Homes built this custom for buyer home in the mixed-humid climate in Greer, SC, and certified it to DOE Zero Energy Ready Home specifications in 2016.

Addison Homes built this custom for buyer home in the mixed-humid climate in Greer, SC, and certified it to DOE Zero Energy Ready Home specifications in 2016.
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Addison Homes built this custom home in the mixed-humid climate in Simpsonville, SC, and certified it to DOE Zero Energy Ready Home specifications in 2015.

Addison Homes built this custom home in the mixed-humid climate in Simpsonville, SC, and certified it to DOE Zero Energy Ready Home specifications in 2015.
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Addison Homes built this custom spec home in the mixed-humid climate in Greenville, SC, and certified it to DOE Zero Energy Ready Home specifications in 2018.

Addison Homes built this custom spec home in the mixed-humid climate in Greenville, SC, and certified it to DOE Zero Energy Ready Home specifications in 2018.
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Addison Homes built this custom spec home in the mixed-humid climate in Greenville, SC, and certified it to DOE Zero Energy Ready Home specifications in 2016.

Addison Homes built this custom spec home in the mixed-humid climate in Greenville, SC, and certified it to DOE Zero Energy Ready Home specifications in 2016.
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Addison Homes built this custom spec home in the mixed-humid climate in Greer, SC, and certified it to DOE Zero Energy Ready Home specifications in 2017.

Addison Homes built this custom spec home in the mixed-humid climate in Greer, SC, and certified it to DOE Zero Energy Ready Home specifications in 2017.
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Adhesive caulk is used to seal seams and attach the multiple layers of rigid insulation

Adhesive caulk is used to seal seams and attach the multiple layers of rigid insulation
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Advanced framing details include open headers and reduced framing around windows and two-stud corners to allow more room for insulation in the wall cavities while reducing lumber costs.

Advanced framing details include open headers and reduced framing around windows and two-stud corners to allow more room for insulation in the wall cavities while reducing lumber costs.
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Advanced framing techniques include constructing on a 2-foot grid where wall studs are placed 24 inches on center and aligned with roof and floor trusses for a continuous load path from roof to foundation.

Advanced framing techniques include constructing on a 2-foot grid where wall studs are placed 24 inches on center and aligned with roof and floor trusses for a continuous load path from roof to foundation.
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Advanced Framing vs Traditional Framing

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After all holes through the ceiling are air-sealed and the baffles have been installed, then the insulation can be installed.

After all holes through the ceiling are air-sealed and the baffles have been installed, then the insulation can be installed.
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Air seal and insulate drawer and closet boxes in attic kneewalls

Air seal and insulate drawer and closet boxes in attic kneewalls
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Air seal at cabinet soffit - single-story

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Air seal at cabinet soffit - single-story
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Air seal at cabinet soffit - two-story

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Air seal at cabinet soffit - two-story
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Air seal at duct soffit

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Air seal at duct soffit
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Air seal attic access panels and drop-down stairs to minimize air leakage.

Air seal attic access panels and drop-down stairs to minimize air leakage.
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Air seal floor joist cavities under kneewall with rigid foam, plywood, or OSB caulked in place

Air seal floor joist cavities under kneewall with rigid foam, plywood, or OSB caulked in place
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Air seal the attic access panel with weatherstripping.

Air seal the attic access panel with weatherstripping.