How To Patch Sheet Metal Ductwork

There are several widths of tape to choose from.

How to patch sheet metal ductwork. Use your leg a workbench or the ground to support the back side of the pipe. Hold firmly in place and drill the appropriate size hole through both layers of metal using a drill fitted with the required size drill bit for. 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. For a fiberboard duct secure the patch with a strip of foil tape along each side.

You ll need a drill sheet metal snips a start collar. The patch is screwed into place with. Wherever there s a joint or intrusion use sealant. 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. Place the repair sheet metal over the damaged area. For smaller holes apply mastic like caulk. 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.

A thin sheet metal patch can also be cut to fit the hole with sheet metal shears. Tape cracks or holes larger than 1 8 inch diameter with the tape selected. Two inch 3 inch and 4 inch widths are common. Use one hand to keep the two edges close and the other to apply downward pressure.

So what we re going to do is we re going to take a piece of scrap sheet metal. Assemble the metal ducting like a zipper when assembling pipe start at one end and work the seam together like a zipper. Seal all the duct joints holes and connections near the furnace. Finally run a bead of silicone caulk around the edges of the patch to prevent air leaks.

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. Seal the duct to register connection as well.