How To Insulate Sheet Metal Ductwork

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 ductwork. Go to the basement or crawl space of your home. Check the speed of the blower motor on the furnace. Foil backed self adhesive foam duct insulation. Make sure the foil surface of the insulation is free of dust before applying the tape.

The 36 wide rolls are great for insulating sheet metal duct runs and the 9 wide rolls are great for insulating fittings. Insulating hvac ductwork when insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. See below for a shopping list tools and steps subscribe to this old house. To fit your ducts simply cut the sleeve to length with a sharp pair of scissors.

Wrap metal duct tape around any seams you see in the ducts. 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. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct.

Be sure to seal any rips or punctures in the vapor barrier with tape so no moisture can get in. Richard trethewey helps a homeowner insulate his ductwork. If you are installing preformed insulation disconnect an elbow place a plastic cap over the end of the duct and slide. How to insulate sheet metal ac ducts 1.

You can fasten and secure the ends of the batts with duct tape but that may cause the insulation to get spoiled. Make sure you seal all of the ductwork joints you had left unsealed in order to. Installs easily and wraps around irregular ductwork areas well. Therefore mechanical fasteners are more advisable for usage than duct tape.

Wear work gloves long sleeves and long. If necessary switch the wires to reduce the blower to its lowest. Use a paintbrush to apply duct mastic to the joints where an elbow.