Block off plate needs some gap help. Please advise.

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clydesdale

Member
Mar 8, 2016
180
New York
This block off plate has been installed for 8 years, but while addressing some cleaning, I figured I could maybe seal this a bit better. Do I just shove this gap full with some insulation? Any in particular? I forget what I used 8 years ago. Thanks.
 
No pic?

Any insulation should be rockwool, not glass fiber (or cellulose...)

Can use silicone too for smaller gaps.
 
Really big gaps I would consider pop riveting to fill.
 
Oops. Here is the pic

[Hearth.com] Block off plate needs some gap help.  Please advise.
 
They also don't seem to make small quantities. I may run over to my dealer and ask them for a remnant sheet, unless there are some other suggestions. It seems like the smallest amount I can get from Depot is about $55.
 
At Amazon there are ceramic insulation blankets for less..1*1 or 2*2 ft.
Make sure it's ceramic and is fire rated