How to Cut Treated Lumber


Pressure-treated wood is lumber that has been enhanced with chemicals that prevent insect, sun and moisture damage. Treated lumber typically takes on a green hue due to the chemicals that were pressurized into the wood. When cutting treated lumber, take safety precautions to prevent injury from dust and debris. When handling the chemical-treated lumber, wear protection to deter the absorption of toxins through the skin. Cutting treated lumber with a saw is no different than cutting untreated lumber.

Things You'll Need

  • Treated lumber
  • Measuring utensils
  • Breathing mask
  • Safety glasses
  • Ear protection
  • Gloves
  • Cutting tool, such as a saw
  • Sealer
  • Paintbrush
  • Place the piece of lumber on a flat, workable surface, such as the ground, a saw horse or a table. Make sure that when cuts are made into the lumber, the saw blade will not hit any other objects.

  • Use a pencil or measuring tool to place marks where the cut needs to be made.

  • Put on personal protective equipment, such as a breathing mask, safety glasses and ear protection. Wear gloves to prevent absorption of dangerous chemicals through your skin.

  • Place the tip of the cutting tool to the line where you will be making the cut. Turn the tool on and cut the line. Keep all body parts away from the saw blade.

  • Brush the freshly cut portion of lumber with a lumber sealer. For best results, use the same product that the wood was treated with, to create a proper seal against the elements. Let the product soak into the wood per the manufacturer's instructions prior to using the lumber.

Tips & Warnings

  • Cut the treated lumber in a well-ventilated area.

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  • Photo Credit lumber 1 image by jimcox40 from
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