How To Patch Sheet Metal Ductwork

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.

How to patch sheet metal ductwork.

Seal the duct to register connection as well. Choose the width that. In this video we show you the best and safest way to cut a round hole into a can or rectangular duct. Finally run a bead of silicone caulk around the edges of the patch to prevent air leaks.

Cover with the mastic to create a durable duct patch. For smaller holes apply mastic like caulk. The patch is screwed into place with. 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.

Use your leg a workbench or the ground to support the back side of the pipe. A thin sheet metal patch can also be cut to fit the hole with sheet metal shears. 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. 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. 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. For a fiberboard duct secure the patch with a strip of foil tape along each side.

Tape cracks or holes larger than 1 8 inch diameter with the tape selected. You ll need a drill sheet metal snips a start collar. 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. Place the repair sheet metal over the damaged area.

Wherever there s a joint or intrusion use sealant. So what we re going to do is we re going to take a piece of scrap sheet metal.