How To Patch Sheet Metal Ductwork

The patch is screwed into place with.

How to patch sheet metal ductwork.

If you are installing the metal patch on fiberboard ductwork place a length of metal foil tape on each side of the metal patch to secure it to the ductwork. So what we re going to do is we re going to take a piece of scrap sheet metal. Use one hand to keep the two edges close and the other to apply downward pressure. Tape cracks or holes larger than 1 8 inch diameter with the tape selected.

In this video we show you the best and safest way to cut a round hole into a can or rectangular duct. For a fiberboard duct secure the patch with a strip of foil tape along each side. Choose the width that. Two inch 3 inch and 4 inch widths are common.

Now this is just a piece of a duct that i just bent and it s the same material that the ductwork is made out of. There are several widths of tape to choose from. If you re patching a sheet metal duct use a power screwdriver to drive a 10 self tapping sheet metal screw into each corner of the patch. Finally run a bead of silicone caulk around the edges of the patch to prevent air leaks.

A thin sheet metal patch can also be cut to fit the hole with sheet metal shears. Seal the duct to register connection as well. What we re going to do is cut this close to the right length and we re going to seal it up with some mastic and screw it down with these self tapping screws. Cover with the mastic to create a durable duct patch.

Use your leg a workbench or the ground to support the back side of the pipe. You ll need a drill sheet metal snips a start collar. Seal all the duct joints holes and connections near the furnace. Set the cut piece of 26 ga sheet metal against the side of the ductwork and run a 10 self tapping sheet metal screw into one corner of the metal patch if you are installing the patch on metal ductwork.

For smaller holes apply mastic like caulk. Wherever there s a joint or intrusion use sealant.