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Video:

Sealed and Insulated Flex Ducts

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Sealing the vent area insulation

Sealing the vent area insulation
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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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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 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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Structural system components of a crawl space

Structural system components of a crawl space
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Sump pump installed in the basement or crawlspace floor

Sump pump installed in the basement or crawlspace floor
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Sump pumps should have tight fitting cover

Sump pumps should have tight fitting cover
Video:

Support at Intervals for Flex Ducts (1)

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Tape over the seam connecting the flex duct to the trunk duct; in this case two 3-inch-wide pieces of tape were put together then laid over the seam.

Tape over the seam connecting the flex duct to the trunk duct; in this case two 3-inch-wide pieces of tape were put together then laid over the seam.
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Tape the flex duct core to the take-off collar using UL-181 foil mastic tape.

Tape the flex duct core to the take-off collar using UL-181 foil mastic tape.
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Taping polyethylene sheeting at interior pier footings

Taping polyethylene sheeting at interior pier footings