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Image:

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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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
Video:

Advanced Framing vs Traditional Framing

Presentation:

Advances in Manufactured Home Energy Efficient Design

Advances in Manufactured Home Energy Efficient Design
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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.
CAD File:

Air barrier at garage band joist - 1 1/2 inch rigid insulation with 2x4 sleepers

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Air barrier at garage band joist - 1 1/2 inch rigid insulation with 2x4 sleepers
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Air barrier is continuous across several components of the lower section of wall

Air barrier is continuous across several components of the lower section of wall
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Air seal and insulate double-walls that are half-height or full-height walls used as architectural features in homes.

Air seal and insulate double-walls that are half-height or full-height walls used as architectural features in homes.
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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
CAD File:

Air seal at cabinet soffit - single-story

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Air seal at cabinet soffit - single-story
CAD File:

Air seal at cabinet soffit - two-story

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Air seal at cabinet soffit - two-story
CAD File:

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.
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Air seal the attic access pull-down stairs opening with weatherstripping.

Air seal the attic access pull-down stairs opening with weatherstripping.
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Air seal the floor above an unconditioned basement or crawlspace and make sure floor insulation is in full contact with the underside of the subfloor.

Air seal the floor above an unconditioned basement or crawlspace and make sure floor insulation is in full contact with the underside of the subfloor.
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Air seal the top, bottom, and sides of a cantilevered floor cavity and ensure that insulation is in full contact with all sides without voids.

Air seal the top, bottom, and sides of a cantilevered floor cavity and ensure that insulation is in full contact with all sides without voids.
CAD File:

Air sealing at attic hatch - finish screws

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Air sealing at attic hatch - finish screws
CAD File:

Air sealing at attic pull down attic stair

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Air sealing at attic pull down attic stair