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Duct insulated with a minimum of R-8 insulation

Duct insulated with a minimum of R-8 insulation

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Insulated floor above garage - cavity insulation with 1 inch rigid insulation with 2x2 wood furring

Insulated floor above garage - cavity insulation with 1 inch rigid insulation with 2x2 wood furring

CAD File

Ducts are properly insulated and supported without compressing the insulation

Ducts are properly insulated and supported without compressing the insulation

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Ducts are insulated but strapping is compressing the insulation therefore reducing the R-value

Ducts are insulated but strapping is compressing the insulation therefore reducing the R-value

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Duct and HVAC Insulation

Reference

Information sheet with HVAC duct insulation, testing, maintenance and performance information.

Right – Batt insulation provides additional insulation for the home’s main duct chase.

Right – Batt insulation provides additional insulation for the home’s main duct chase.

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Sealed and Insulated Flex Ducts

Video

Video describing how to seal and insulate flex ducts.

Sealed and Insulated Metal Ducts

Guide

Guide describing how to air seal and insulate metal ducts.

Sealed and Insulated Flex Ducts

Guide

Guide describing how to air seal and insulate flex ducts.

Ducts Buried in Attic Insulation

Guide

Guide describing the practice of burying HVAC ducts in loose-fill insulation on the attic floor.

Ducts Buried in Attic Insulation and Encapsulated

Guide

Guide describing approaches to burying and encapsulating ducts in unconditioned attics to increase the overall R-value of duct insulation.

Air seal and insulate flex ducts

Air seal and insulate flex ducts

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Install bottom layer of rigid insulation

Install bottom layer of rigid insulation

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Duct insulation is installed over boot

Duct insulation is installed over boot

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Insulation does not cover boot and is not sealed

Insulation does not cover boot and is not sealed

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Duct is located in unconditioned space and is not insulated

Duct is located in unconditioned space and is not insulated

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Prepare chase with adhesive for bottom insulation

Prepare chase with adhesive for bottom insulation

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Sealed and Insulated Fiber Board Ducts

Guide

Guide describing how to air seal and insulate fiber board ducts.

Insulation does not cover boot and is not sealed

Insulation does not cover boot and is not sealed

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Insulation does not cover boot and is not sealed

Insulation does not cover boot and is not sealed

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No insulation installed in cavity and not air sealed

No insulation installed in cavity and not air sealed

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Duct is located in unconditioned space and is properly insulated

Duct is located in unconditioned space and is properly insulated

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Wrong: Insulation not fully enclosing duct chase

Wrong: Insulation not fully enclosing duct chase

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The jump duct should be insulated and sealed at registers

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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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Ducts Encapsulated in Spray Foam and Buried in Attic Insulation

Video

Video describing various ways to bring HVAC ducts installed in an attic within the thermal envelope of the home by insulating the attic or by covering the ducts with spray foam and burying them in fibrous insulation.

Measure Guideline: Sealing and Insulating Ducts in Existing Homes

Reference

Report describing the sealing and insulating of HVAC duct systems in existing homes.

Prescriptive Path: Supply ducts in unconditioned attic have insulation ≥ R-8. Performance Path: Supply ducts in unconditioned attic have insulation ≥ R-6

Prescriptive Path: Supply ducts in unconditioned attic have insulation ≥ R-8. Performance Path: Supply ducts in unconditioned attic have insulation ≥ R-6

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Pull the insulation and outer liner of the flex duct over the collar to come in full contact with the liner and insulation of the trunk line or fitting and tape in place

Pull the insulation and outer liner of the flex duct over the collar to come in full contact with the liner and insulation of the trunk line or fitting and tape in place

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Wrong – Fibrous insulation does not air seal

Wrong – Fibrous insulation does not air seal

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