How To Insulate Sheet Metal Duct

Go to the basement or crawl space of your home.

How to insulate sheet metal duct.

The two most common ways to insulate ductwork are. 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. The 36 wide rolls are great for insulating sheet metal duct runs and the 9 wide rolls are great for insulating fittings. You can fasten and secure the ends of the batts with duct tape but that may cause the insulation to get spoiled.

Invest in duct insulation today to safeguard your family s health and your pocketbook. I m installing properly sealed round metal ducts in my unconditioned attic for heating and cooling. Applying spray foam insulation to the outside of the duct. Therefore mechanical fasteners are more advisable for usage than duct tape.

Wrapping the duct in a foil faced blanket. Use a paintbrush to apply duct mastic to the joints where an elbow. For a more secure installation use fiberglass spray glue adhesiveto attach the fiberglass to the sheet metal. Lastly buy hollow core foam insulation which is easy to install as it self seals and works best with long lengths of pipe.

Simply unroll the fiberglass and wrap around the duct in a spiral fashion making sure to overlap the ends at least 1 to make sure that all of the exposed metal is covered. You re throwing money out the window. Protect yourself from itchy fibers when working with fiberglass insulation. I m trying to achieve an r 8 insulation value but the big box stores only sell r 6 frost king wraps.

If you need help deciding which type of insulation you need set up an energy consultation. Duct liner isn t generally a diy installation and if your ducts already have liner you don t need to insulate the exterior. Duct board much like the duct liner is also a fiberglass product. 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.

Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. How to insulate sheet metal ac ducts 1. I ve probably got 100 total of 6 duct to cover. Choose a faced fiberglass.

Check the speed of the blower motor on the furnace. For your situation it s when the cool air hits the warm metal duct. 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. Wrap metal duct tape around any seams you see in the ducts.

If necessary switch the wires to reduce the blower to its lowest. Wear work gloves long sleeves and long. Start saving money today.