How to Cut Concrete Board

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Concrete backer board consists of concrete sandwiched between two layers of mesh. The mesh keeps the board from cracking. When installing concrete board for tile installation or as a fire barrier for a fireplace, you might have to cut the board to size. Cutting concrete board with a power saw creates a lot of dust and causes excessive wear on a power saw. One method of cutting creates no dust and cuts quicker than a power saw.

Things You'll Need

  • Tape measure
  • Fine-tipped permanent marker
  • Straightedge
  • Carbide tipped cutter
  • Wood rasp
  • Place a concrete board flat on the floor with the smooth side of the board facing up.

  • Pull a tape measure along one side of the concrete board. Mark the cut length on the smooth face of the concrete board with a fine-tipped permanent marker. Move the tape measure to the other side of the board and repeat the process to place a second length mark on the board's face.

  • Align one side of a straightedge with the two length marks. Drag a fine-tipped permanent marker along the aligned edge to create a cut line on the face of the concrete board. Remove the straightedge from the concrete board.

  • Pull the carbide tipped cutter along the marked line several times to score the outer mesh of the concrete board.

  • Stand the scored concrete board on edge. Tap behind the score to snap the board to length.

  • Lay the snapped board flat on the floor with the snapped side of the concrete board facing the floor.

  • Pull the carbide tipped cutter along the connected mesh until the cut piece pulls freely from the concrete board.

  • Slide the wood rasp along the snapped edge to even out jagged edges.

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References

  • Photo Credit concrete backgrond image by Alison Bowden from Fotolia.com
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