How To Insulate Sheet Metal Ductwork

Protect yourself from itchy fibers when working with fiberglass insulation.

How to insulate sheet metal ductwork.

You can fasten and secure the ends of the batts with duct tape but that may cause the insulation to get spoiled. Wrap metal duct tape around any seams you see in the ducts. Check the speed of the blower motor on the furnace. Installs easily and wraps around irregular ductwork areas well.

Make sure the foil surface of the insulation is free of dust before applying the tape. See below for a shopping list tools and steps subscribe to this old house. Wear work gloves long sleeves and long. If you are installing preformed insulation disconnect an elbow place a plastic cap over the end of the duct and slide.

To fit your ducts simply cut the sleeve to length with a sharp pair of scissors. 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. Make sure you seal all of the ductwork joints you had left unsealed in order to. Choose a faced fiberglass.

Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. Be sure to seal any rips or punctures in the vapor barrier with tape so no moisture can get in. Insulating hvac ductwork when insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. The 36 wide rolls are great for insulating sheet metal duct runs and the 9 wide rolls are great for insulating fittings.

How to insulate sheet metal ac ducts 1. Go to the basement or crawl space of your home. Use a paintbrush to apply duct mastic to the joints where an elbow. Richard trethewey helps a homeowner insulate his ductwork.

If necessary switch the wires to reduce the blower to its lowest. Foil backed self adhesive foam duct insulation. Lastly buy hollow core foam insulation which is easy to install as it self seals and works best with long lengths of pipe.