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Right – The backing on this knee wall was air sealed prior to insulation.

Right – The backing on this knee wall was air sealed prior to insulation.

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Right – HVAC platform installed to allow for proper insulation depth

Right – HVAC platform installed to allow for proper insulation depth

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Right – Insulation installed to correct depth and will be aligned with air barrier

Right – Insulation installed to correct depth and will be aligned with air barrier

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Right - Spray foam insulation has been sprayed onto the underside of the sloped roof and the gable end wall to provide a sealed, insulated attic for housing the HVAC ducts

Right - Spray foam insulation has been sprayed onto the underside of the sloped roof and the gable end wall to provide a sealed, insulated attic for housing the HVAC ducts

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Air Sealing, Insulating, and Venting Attics and Roofs to Reduce Heat Gain

Information Guide

Information guide providing links to guides describing specific ways to air-seal, insulate, and ventilate attics and roofs to minimize heat gain in new and existing homes.

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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Application of Spray Foam Insulation Under Plywood and OSB Roof Sheathing

Video

Video describing how to air seal attic rafters with spray foam.

Spray foam insulation used for raised ceiling duct chase.

Spray foam insulation used for raised ceiling duct chase.

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New baffles are stapled in the eaves of this attic prior to installing insulation

New baffles are stapled in the eaves of this attic prior to installing insulation

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To reduce the risk of condensation on the interior of the roof sheathing in cold weather, the ratio of exterior (above-deck) insulation must be increased as a percent of total attic insulation as outside temperature decreases

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Why Are Attics Insulated With Open-Cell Spray Foam So Damp?

Why Are Attics Insulated With Open-Cell Spray Foam So Damp?

Presentation

Presentation describing issues with condensation in unvented attics insulated with open-cell spray foam.

The attic duct chase insulated and sealed to the attic floor with spray foam

The attic duct chase insulated and sealed to the attic floor with spray foam

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Imagine Homes chose low-density spray foam to insulate this attic.

Imagine Homes chose low-density spray foam to insulate this attic.

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Unvented Conditioned Attic with Spray Foam Insulation Below Roof Deck

Guide

Guide describing a method for insulating an unvented attic by spraying foam insulation along the underside of the roof deck.

Right: Ducts are completely buried beneath insulation to the depth specified in the plans

Right: Ducts are completely buried beneath insulation to the depth specified in the plans

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Spray foam insulates and air seals the underside of the attic roof and walls.

Spray foam insulates and air seals the underside of the attic roof and walls.

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The duct for this exhaust fan is properly routed through the roof and the duct is insulated

The duct for this exhaust fan is properly routed through the roof and the duct is insulated

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A standard site-built roof of rafters may pinch the insulation at the eaves

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Right - A wood dam was constructed to hold back the attic floor insulation

Right - A wood dam was constructed to hold back the attic floor insulation

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Wrong – The framing and wind baffle installation will not allow for required insulation depth.

Wrong – The framing and wind baffle installation will not allow for required insulation depth.

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Wrong – Drop down stairs do not have insulation cover installed

Wrong – Drop down stairs do not have insulation cover installed

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Wrong – Attic access panel does not have an insulation cover installed

Wrong – Attic access panel does not have an insulation cover installed

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Right – Top and bottom plates were installed prior to backing and insulation.

Right – Top and bottom plates were installed prior to backing and insulation.

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Right – Rigid backing was installed prior to insulating the attic knee walls.

Right – Rigid backing was installed prior to insulating the attic knee walls.

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Wrong – The backing on this knee wall was not air sealed prior to adding insulation.

Wrong – The backing on this knee wall was not air sealed prior to adding insulation.

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Wrong: Ducts are held above the ceiling plane with strapping to provide a good angle into top-entry boots. Once the ceiling insulation is added, this duct will protrude from the ceiling insulation and will not be buried

Wrong: Ducts are held above the ceiling plane with strapping to provide a good angle into top-entry boots. Once the ceiling insulation is added, this duct will protrude from the ceiling insulation and will not be buried

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2x10 Rafter - Insulation Above Roof Deck and In Rafter Cavity CAD

2x10 Rafter - Insulation Above Roof Deck and In Rafter Cavity CAD

CAD File

2x10 Rafter - Insulation Below Roof Deck In Rafter Cavity CAD

2x10 Rafter - Insulation Below Roof Deck In Rafter Cavity CAD

CAD File

2x12 Rafter - Insulation Above Roof Deck and In Rafter Cavity CAD

2x12 Rafter - Insulation Above Roof Deck and In Rafter Cavity CAD

CAD File

2x12 Rafter - Insulation Below Roof Deck In Rafter Cavity CAD

2x12 Rafter - Insulation Below Roof Deck In Rafter Cavity CAD

CAD File

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