1 heat shield spacers are available online or sometimes at your local hardware store for this purpose.
Cement board wood stove heat shield.
Specific requirements for heat shielding your stove may require more than one piece of concrete backer board to meet the required dimensions.
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The tan ceramic tile heat shield behind the woodstove and its flue in this photo was constructed by the author df in 1990 by bonding ceramic tile to a factory made fireproof heat shield board consisting of metal covering a fireproof cement board.
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The back of the stove was about 18 to 24 from the wall.
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.
The manufacturer of one brand of cement board says it is suitable for heat shielding go to the faq.
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.
Backer board is a heat shield that is found behind wood burning stoves.
Constructing the heat shield itself is a relatively easy process.
This approach is rather unattractive though so you can beautify the cement board by.
It got extremely warm almost hot on the wood floor and the wall board in back of the stove got hot but not much of a concern.
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.
Modern wood stoves can be installed closer to the wall because of backer boards.
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.
The simplest masonry heat shield is a cement board that is separated from the wall by one inch ceramic spacers.