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Attach a strong permanent cover to gable end vents before a severe storm strikes to prevent moisture intrusion.

Attach a strong permanent cover to gable end vents before a severe storm strikes to prevent moisture intrusion.
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Attic access panel air sealing

Attic access panel air sealing
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Attic Eave Minimum Insulation (1)

Video:

Attic Eave Minimum Insulation (2)

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Attic Eave Minimum Insulation (3)

Video:

Attic Hatch Insulation

Video:

Attic Knee Walls

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Attic radiant barriers

Attic radiant barriers
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Attic ventilation fans exhaust hot air from the attic while replacing it with cooler air from the outside through intake vents

Attic ventilation fans exhaust hot air from the attic while replacing it with cooler air from the outside through intake vents
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Average wet-bulb temperatures across the United States

Average wet-bulb temperatures across the United States
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Back-draft damper still has a piece of tape that prevented it from rattling during shipping

Back-draft damper still has a piece of tape that prevented it from rattling during shipping
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Baffles are installed to protect airflow from the soffits to the ridge vents before the ceiling drywall and attic insulation are installed.

Baffles are installed to protect airflow from the soffits to the ridge vents before the ceiling drywall and attic insulation are installed.
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Baffles provide an air space over the insulation to guide ventilation air from the soffit vents up along the underside of the roof deck

Baffles provide an air space over the insulation to guide ventilation air from the soffit vents up along the underside of the roof deck
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Balanced ventilation dominates ventilation specifications by Zero Energy Ready Home builders

Balanced ventilation dominates ventilation specifications by Zero Energy Ready Home builders
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Balanced ventilation strategy for conditioned attic spaces

Balanced ventilation strategy for conditioned attic spaces
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Balloon framing at a gable end wall allows air to flow from the conditioned space and the wall cavity into the attic.

Balloon framing at a gable end wall allows air to flow from the conditioned space and the wall cavity into the attic.
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Bathrooms should be equipped with an exhaust fan that vents directly outdoors

Bathrooms should be equipped with an exhaust fan that vents directly outdoors
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Batt insulation is installed at the attic floor

Batt insulation is installed at the attic floor
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Batt insulation is installed in two layers in perpendicular directions against the baffle to full required insulation height

Batt insulation is installed in two layers in perpendicular directions against the baffle to full required insulation height
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Batt insulation is installed in two layers with offset seams against the baffle to full code-required insulation height

Batt insulation is installed in two layers with offset seams against the baffle to full code-required insulation height
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Because flue temperatures are cool, intake and exhaust ducts on a Category 4 direct-vent sealed-combustion condensing furnace can be made of PVC

Because flue temperatures are cool, intake and exhaust ducts on a Category 4 direct-vent sealed-combustion condensing furnace can be made of PVC
Case Study:

Bedford Farmhouse High Performance Retrofit Prototype

Bedford Farmhouse High Performance Retrofit Prototype
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Bedrooms pressure-balanced and provide 1 sq. in. of free area opening per 1 CFM of supply air or achieve a Rater-measured pressure differential ≤ 3 Pa

Bedrooms pressure-balanced and provide 1 sq. in. of free area opening per 1 CFM of supply air or achieve a Rater-measured pressure differential ≤ 3 Pa
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Bedrooms pressure-balanced and provide 1 sq. in. of free area opening per 1 CFM of supply air or achieve a Rater-measured pressure differential ≤ 3 Pa

Bedrooms pressure-balanced and provide 1 sq. in. of free area opening per 1 CFM of supply air or achieve a Rater-measured pressure differential ≤ 3 Pa