How To Insulate Sheet Metal Duct

Applying spray foam insulation to the outside of the duct.

How to insulate sheet metal duct.

If you need help deciding which type of insulation you need set up an energy consultation. 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. I m installing properly sealed round metal ducts in my unconditioned attic for heating and cooling. Press a continuous strip of foil tape to all longitudinal seams along straight runs of 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. For a more secure installation use fiberglass spray glue adhesiveto attach the fiberglass to the sheet metal. Therefore mechanical fasteners are more advisable for usage than duct tape. I ve probably got 100 total of 6 duct to cover.

Invest in duct insulation today to safeguard your family s health and your pocketbook. Wrapping the duct in a foil faced blanket. 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. 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.

For your situation it s when the cool air hits the warm metal duct. Wear work gloves long sleeves and long. I m trying to achieve an r 8 insulation value but the big box stores only sell r 6 frost king wraps. You can fasten and secure the ends of the batts with duct tape but that may cause the insulation to get spoiled.

Go to the basement or crawl space of your home. Stop wasting money and energy with a leaking duct system. Check the speed of the blower motor on the furnace. 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. Start saving money today. You re throwing money out the window. Use a paintbrush to apply duct mastic to the joints where an elbow.

Wrap metal duct tape around any seams you see in the ducts. Lastly buy hollow core foam insulation which is easy to install as it self seals and works best with long lengths of pipe. How to insulate sheet metal ac ducts 1. Protect yourself from itchy fibers when working with fiberglass insulation.

Choose a faced fiberglass. If necessary switch the wires to reduce the blower to its lowest. Start at your heating and cooling units and work toward the last register as you did when searching out the leaks.