How to Insulate Ductwork | Ask This Old House
Richard Trethewey helps a homeowner insulate his ductwork. (See below for a shopping list, tools, and steps.)
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Shopping List for How to Insulate Ductwork:
Foil tape [], for sealing ducts
Duct mastic [], used to seal duct joints
Foil tape with mastic membrane [], for sealing ducts
1-inch foil-faced fiberglass batt insulation [], used to insulate ducts
Preformed fiberglass duct insulation [], for insulating ducts
Tools for How to Insulate Ductwork:
2-inch paintbrush [], for applying duct mastic
Utility knife [], used to cut insulation
Steps for How to Insulate Ductwork:
1. Check the speed of the blower motor on the furnace. If necessary, switch the wires to reduce the blower to its lowest speed.
2. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct.
3. Use a paintbrush to apply duct mastic to the joints where an elbow connects to a duct.
4. Use a utility knife to cut foil-faced fiberglass insulation to the proper size.
5. Wrap the insulation around the duct, and then pinch the seam closed. Secure the insulation with short strips of foil tape.
6. Apply a long strip of foil tape along the seam in the insulation. Repeat to insulate the remaining ducts.
7. To install preformed duct insulation, start by disconnecting an elbow to expose the end of the duct.
8. Snap a plastic cap onto the duct end, then slip the preformed insulation over the duct.
9. Gently pull the insulation over the entire length of duct.
About Ask This Old House TV:
Homeowners have a virtual truckload of questions for us on smaller projects, and we're ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by our viewers—and we make house calls! Ask This Old House features some familiar faces from This Old House, including Kevin O'Connor, general contractor Tom Silva, plumbing and heating expert Richard Trethewey, and landscape contractor Roger Cook.
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How to Insulate Ductwork | Ask This Old House
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SUBSCRIBE to This Old House:
Shopping List for How to Insulate Ductwork:
Foil tape [], for sealing ducts
Duct mastic [], used to seal duct joints
Foil tape with mastic membrane [], for sealing ducts
1-inch foil-faced fiberglass batt insulation [], used to insulate ducts
Preformed fiberglass duct insulation [], for insulating ducts
Tools for How to Insulate Ductwork:
2-inch paintbrush [], for applying duct mastic
Utility knife [], used to cut insulation
Steps for How to Insulate Ductwork:
1. Check the speed of the blower motor on the furnace. If necessary, switch the wires to reduce the blower to its lowest speed.
2. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct.
3. Use a paintbrush to apply duct mastic to the joints where an elbow connects to a duct.
4. Use a utility knife to cut foil-faced fiberglass insulation to the proper size.
5. Wrap the insulation around the duct, and then pinch the seam closed. Secure the insulation with short strips of foil tape.
6. Apply a long strip of foil tape along the seam in the insulation. Repeat to insulate the remaining ducts.
7. To install preformed duct insulation, start by disconnecting an elbow to expose the end of the duct.
8. Snap a plastic cap onto the duct end, then slip the preformed insulation over the duct.
9. Gently pull the insulation over the entire length of duct.
About Ask This Old House TV:
Homeowners have a virtual truckload of questions for us on smaller projects, and we're ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by our viewers—and we make house calls! Ask This Old House features some familiar faces from This Old House, including Kevin O'Connor, general contractor Tom Silva, plumbing and heating expert Richard Trethewey, and landscape contractor Roger Cook.
Follow This Old House and Ask This Old House:
Facebook:
Twitter:
Pinterest:
Instagram:
Tumblr:
For more on This Old House and Ask This Old House, visit us at:
How to Insulate Ductwork | Ask This Old House
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