I need to get a piece of sheetmetal to screw up into the frame of a broken damper so I can seal off my chimney for a set of unvented gas logs. Any idea on what thickness or grade of sheetmetal to use for a high heat area such as this? Also, the damper is some pretty hefty steel..any ideas on how to drive a screw through it..a special drill bit maybe?
Answers:
1Use a thick piece (at least 1/2", probably 3/4") of cast iron or high-carbon steel. You probably would want a drill press to drill through something that thick, then use the biggest self-tapping screws you can find. You might also want to cap the top of the chimney to keep birds and stuff out.
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