How To Insulate Sheet Metal Duct

I m trying to achieve an r 8 insulation value but the big box stores only sell r 6 frost king wraps.

How to insulate sheet 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. For a more secure installation use fiberglass spray glue adhesiveto attach the fiberglass to the sheet metal. Wrapping the duct in a foil faced blanket. Duct liner isn t generally a diy installation and if your ducts already have liner you don t need to insulate the exterior.

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. 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. Next seal the leaks with one or more appropriate sealants. Lastly buy hollow core foam insulation which is easy to install as it self seals and works best with long lengths of pipe.

I ve probably got 100 total of 6 duct to cover. Wrap metal duct tape around any seams you see in the ducts. How to insulate sheet metal ac ducts 1. Start at your heating and cooling units and work toward the last register as you did when searching out the leaks.

Use a paintbrush to apply duct mastic to the joints where an elbow. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. If you need help deciding which type of insulation you need set up an energy consultation. For your situation it s when the cool air hits the warm metal duct.

Protect yourself from itchy fibers when working with fiberglass insulation. Duct board much like the duct liner is also a fiberglass product. Wear work gloves long sleeves and long. The 36 wide rolls are great for insulating sheet metal duct runs and the 9 wide rolls are great for insulating fittings.

Therefore mechanical fasteners are more advisable for usage than duct tape. If necessary switch the wires to reduce the blower to its lowest. Check the speed of the blower motor on the furnace. The two most common ways to insulate ductwork are.

Go to the basement or crawl space of your home. You re throwing money out the window. Invest in duct insulation today to safeguard your family s health and your pocketbook. Applying spray foam insulation to the outside of the duct.

You can fasten and secure the ends of the batts with duct tape but that may cause the insulation to get spoiled. Choose a faced fiberglass. 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.