How To Insulate Sheet Metal Duct

Wrapping the duct in a foil faced blanket.

How to insulate sheet metal duct. Wrap metal duct tape around any seams you see in the ducts. If necessary switch the wires to reduce the blower to its lowest. You can fasten and secure the ends of the batts with duct tape but that may cause the insulation to get spoiled. The 36 wide rolls are great for insulating sheet metal duct runs and the 9 wide rolls are great for insulating fittings.

To fix this you can 1 insulate the outside of the duct so it doesn t warm to room temperature 2 insulate the inside of the duct so the cool air never meets the warm metal duct or 3 both. The two most common ways to insulate ductwork are. I m installing properly sealed round metal ducts in my unconditioned attic for heating and cooling. Therefore mechanical fasteners are more advisable for usage than duct tape.

Protect yourself from itchy fibers when working with fiberglass insulation. Invest in duct insulation today to safeguard your family s health and your pocketbook. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. Lastly buy hollow core foam insulation which is easy to install as it self seals and works best with long lengths of pipe.

For your situation it s when the cool air hits the warm metal duct. Start at your heating and cooling units and work toward the last register as you did when searching out the leaks. I m trying to achieve an r 8 insulation value but the big box stores only sell r 6 frost king wraps. Use a paintbrush to apply duct mastic to the joints where an elbow.

Duct board much like the duct liner is also a fiberglass product. If you need help deciding which type of insulation you need set up an energy consultation. How to insulate sheet metal ac ducts 1. I ve probably got 100 total of 6 duct to cover.

Go to the basement or crawl space of your home. Choose a faced fiberglass. Applying spray foam insulation to the outside of the duct. Stop wasting money and energy with a leaking duct system.

Next seal the leaks with one or more appropriate sealants. Check the speed of the blower motor on the furnace. You re throwing money out the window. Duct liner isn t generally a diy installation and if your ducts already have liner you don t need to insulate the exterior.

For a more secure installation use fiberglass spray glue adhesiveto attach the fiberglass to the sheet metal. Before sealing your ducts make sure the surfaces to be sealed are clean and dry especially if you plan to use tape as your sealant. Sometimes metal ducts are lined with duct liner a 1 inch thick fiberglass board that insulates the interior of the duct rather than the exterior.