Re: Question about plasma TV Frame
As long as the fireplace has proper, non-combustible surfaces around the opening for a distance as specified by building codes (don't ask me, I don't know what the distances are), you should be fine with the false wall.
It's quite common to have combustible wall surfaces (wood, wallpaper, etc.) above a fireplace, but there must be a brick or tile "buffer" (somewhere around 12" wide) between the opening and the mantlepiece.
If you do go with the false wall idea, it would be wise to consult your local building authority and get the proper permits and inspections. Even though it's not structural, it does deal with fire, and should there be a problem you'll have better luck with your insurance company if the work was permitted, inspected, and approved.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.