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Ok, thanks for the responses. I have every intention of using a 1" airspace, but didn't know how to create it. You have given me 2 viable ways to accomplish it. I also intend on using a contact board that is flame proof behind a built up stone wall. We have left plenty of room where it will be. I just didn't know how to do it. Thanks again. I can quit worrying about that now. On to gutters....and muddy pathsways, and sheetrock. Christina
Re: what Glenn said...Over time the character of the wood can be changed by extended exposure to heat. Temperature Time (days) Condition107°C 224°F 1050 light chocolate color120°C 248°F 1235 brittle, dark-chocolate color140°C 284°F 320 lost 45% of weight, became like charcoal150°C 302°F 165 lost 65% of weight, became like charcoal
...and I believe the flash point gets lower and lower as the wood carbonizes.