R-Value of wall

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UglyStrike

New Member
Mar 9, 2012
23
KY
What R-Value do you need for a wall to be considered non-combustable?

What about fire proof?

Would 1/4" Wonderboard over 1/2" foil backed ceramic insulation (left over from insulating the chimney liner) meet the R-value requirement?

Thanks
 
The term R-value is not used in the context of surrounding walls...only in the hearth beneath the appliance. Non-combustible and fireproof are basically synonymous. It is determined by the materials used, not the R-value.
 
Yes, a sheet of sheetmetal with a 1" air space behind it, open at top and bottom qualifies for NFPA 211 protection.

What are you trying to accomplish, clearance reduction or just peace of mind?
 
What are you trying to accomplish, clearance reduction or just peace of mind?

More peace of mind. My mantel piece will be 1/2" on each side into the clearance area called for by the insert. I am OK on the height clearances. The Wife has to have this oak mantel. I can protect it with the wonderboard and insulation, then blend it in with tile. I just do not want to have anything burn. LOL
 
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