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Video:

Sealed and Insulated Flex Ducts

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Sealed blocking

Sealed blocking
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Seams and connections in rigid metal ducts are air sealed using tape or mastic.

Seams and connections in rigid metal ducts are air sealed using tape or mastic.
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Seams are being properly sealed with mastic and mesh tape

Seams are being properly sealed with mastic and mesh tape
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Second layer of rigid insulation is adhered with foam

Second layer of rigid insulation is adhered with foam
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Self-piercing/self-drilling sheet metal screws are installed on the four tabs (indicated by red stars) to secure the take-off collar to the rectangular metal duct.

Self-piercing/self-drilling sheet metal screws are installed on the four tabs (indicated by red stars) to secure the take-off collar to the rectangular metal duct.
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Seperate dwellings with their own seperate exhaust terminations

Seperate dwellings with their own seperate exhaust terminations
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Sheet metal and mastic provide air sealing around a flue pipe.

Sheet metal and mastic provide air sealing around a flue pipe.
Case Study:

Show Home Targets Energy Efficiency in Hot-Humid Climates

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Side view showing air-sealing and rigid foam insulation is installed over existing wall and ceiling under a room above, then covered with new gypsum board.

Side view showing air-sealing and rigid foam insulation is installed over existing wall and ceiling under a room above, then covered with new gypsum board.
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Side view showing how the existing garage wall and ceiling are air-sealed prior to installing rigid foam insulation on the garage side of the shared wall of an existing home.

Side view showing how the existing garage wall and ceiling are air-sealed prior to installing rigid foam insulation on the garage side of the shared wall of an existing home.
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Some builders create pan joists by attaching a solid sheet good to the bottom of a floor joist to create a return air pathway

Some builders create pan joists by attaching a solid sheet good to the bottom of a floor joist to create a return air pathway
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Specially designed roof trusses come with a two-foot by two-foot notch cut next to the center post providing space to install an insulated duct chase inside the home’s conditioned space but above the normal ceiling height.

Specially designed roof trusses come with a two-foot by two-foot notch cut next to the center post providing space to install an insulated duct chase inside the home’s conditioned space but above the normal ceiling height.
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Spray foam air seals gaps around holes and drywall-to-top plate seams.

Spray foam air seals gaps around holes and drywall-to-top plate seams.
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Spray foam air seals the boot to the ceiling

Spray foam air seals the boot to the ceiling
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Spray foam at band

Spray foam at band
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Spray foam insulates the rim joist and air seals the subfloor-rim joist and rim joist-top plate connections

Spray foam insulates the rim joist and air seals the subfloor-rim joist and rim joist-top plate connections
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Spray foam insulation air-seals and insulates the floor above the garage; the joist will be filled with fibrous insulation in this flash-and-batt approach.

Spray foam insulation air-seals and insulates the floor above the garage; the joist will be filled with fibrous insulation in this flash-and-batt approach.
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Spray foam insulation used for raised ceiling duct chase

Spray foam insulation used for raised ceiling duct chase
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Spray foam insulation used for raised ceiling duct chase.

Spray foam insulation used for raised ceiling duct chase.
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Standard 2 in. by 4 in. stud secures duct chase - made of rigid insulation in this example

Standard 2 in. by 4 in. stud secures duct chase - made of rigid insulation in this example
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Straps are spaced too far apart causing the straps to compress the duct under its own weight

Straps are spaced too far apart causing the straps to compress the duct under its own weight
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Subfloor as air barrier

Subfloor as air barrier
Video:

Support at Intervals for Flex Ducts (1)