Backer board is a heat shield that is found behind wood burning stoves.
Cement board wood stove heat shield.
Modern wood stoves can be installed closer to the wall because of backer boards.
The manufacturer of one brand of cement board says it is suitable for heat shielding go to the faq.
In my experience cement board makes a good heat shield and in at least one jusisdiction with strong codes and enforcement fairfax county va it is accepted as a heat shield material when properly installed.
I used cement board in that same fashion under stove and as a back wall for one year.
This approach is rather unattractive though so you can beautify the cement board by.
A heat shield is necessary to protect the walls from damages due to constant use of the stove and to protect your home from possible fires.
These shields are constructed with a sheet of 24 gauge or thicker sheet metal or 1 2 or thicker cement board with 1 of air space behind the shield and around the perimeter to allow free air flow.
Specific requirements for heat shielding your stove may require more than one piece of concrete backer board to meet the required dimensions.
The back of the stove was about 18 to 24 from the wall.
Hardi cement board is also designed to have ceramic porcelain or stone tiles installed over it to cover and beautify the heat shield after it is installed.
Step 1 use an electric stud finder to find the studs in the wall behind the position that you will place the wood stove.
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Constructing the heat shield itself is a relatively easy process.
The simplest masonry heat shield is a cement board that is separated from the wall by one inch ceramic spacers.
Generally the heat shield must extend a minimum of 20 inches beyond each side of the wood stove and 20 inches above it.