Replacing Hardie Plank Siding


Hardie plank siding is made from a concrete material that is susceptible to dents. A stray hammer strike, or damage from a car or lawn equipment, can easily ding the surface. If Hardie plank is damaged, the easiest course of action may be to replace it. Depending on how proficient you are with a hammer and crowbar, it may take an afternoon or more to complete this project.

Things You'll Need

  • Crow bar
  • Power drill with Phillips screw head bit
  • Safety razor
  • Pencils
  • Circular saw
  • Hardie plank boards
  • Air nail gun
  • Caulk
  • Assess the damage to the siding planks. Note how many planks are affected and how deep the damage is. Also note how the boards are installed. Most are nailed right to the wall with standard 1-inch nails or screws. If the heads of the nails are caulked over, it may take some time to locate all of them.

  • Remove the nails and screws, securing both the overlapping upper planks and planks underneath. Use a crowbar to remove nails and a power drill with a Phillips head bit to take out the screws. If necessary, scrape out the caulk over the nail and screw heads with a safety razor.

  • Slide the damaged plank (or planks) out from under the overlapping upper planks. Measure the opening with a tape measure and cut a new plank to this width with a circular saw. Slide a new plank into the opening under the overlapping plank to replace the damaged plank.

  • Attach the plank to the home with an air gun and nails, or with screws and a power drill, to match your existing installation. Cover the heads of the nails or screws with exterior home caulking and let it dry as indicated on the caulking instructions.

Tips & Warnings

  • Match the grain direction on the repair plank to the grain on the existing planks for the best results.

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  • Photo Credit home sweet home image by David Dorner from
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