How to Install Hardi Cement Board for a Heat Shield Behind a Wood Stove

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Safe wood stove installations require a heat shield that will prevent heat from the wood stove from creating a fire hazard in the building materials that form the exterior wall. Hardi cement board is an inexpensive solution that will form the foundation of an effective heat shield for any application. 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. Constructing the heat shield itself is a relatively easy process.

Things You'll Need

  • Electronic stud finder
  • Pencil
  • 2-inch by 2-inch by 8-foot pieces of lumber
  • Electric drill
  • Drill bit
  • 3-inch drywall screws
  • 1-5/8-inch backer board screws
  • Masonry blade
  • Circular saw
  • Use an electric stud finder to find the studs in the wall behind the position that you will place the wood stove. Mark their positions with a pencil.

  • Drill pilot holes through 2-inch by 2-inch by 8-foot pieces of lumber every 12 inches using an electric drill and a drill bit smaller in diameter than the screws. One piece of lumber is required for each wall stud that will be covered by the Hardi cement board. Shorten them if the heat shield will not cover the wall from floor to ceiling.

  • Attach the 2-inch by 2-inch by 8-foot pieces of lumber directly to the wall studs through the drywall using 3-inch drywall screws. Countersink the screw heads into the 2-inch by 2-inch by 8-foot pieces of lumber at least 1/4-inch.

  • Attach ½-inch Hardi cement board directly to the 2-inch by 2-inch by 8-foot pieces of lumber using 1-5/8-inch backer board screws. Apply screws every six inches. Cut each board to width so seams will land directly over one of the 2-inch by 2-inch by 8-foot pieces of lumber. Hardi cement board is most easily cut using a masonry blade and a circular saw so the cut edge remains stable after cutting.

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