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Covering the wood won't help much. You want to create an airspace between the shield and the wood. Sheet metal or cement board, use spacers on long screws to keep the shield an inch away from the structure behind.
Blackhat
Bad experiences come from poor decisions. So do good stories.
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Asbestos.
There are many manufacturers of heat shield materials specifically for the oven industry. Getting a small amount might be a problem.
https://www.google.com/search?q=heat+shi...e&ie=UTF-8
Go to a junk yard and find a retired stove and take it apart. You will probably find some shielding materials. Don't go for a really old stove or you might end up with some actual asbestos.
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Like mentioned, whatever you use, you need that air gap.
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Thanks guys, an air gap sounds like a good idea. I will probably go with the cement backer board and maybe a 1/2" air gap. There's plenty of room.
Mats
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An inch would be better.
Blackhat
Bad experiences come from poor decisions. So do good stories.