How to Repair HardiePlank Siding

Written by emily beach
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How to Repair HardiePlank Siding
HardiePlank is often embossed to resemble wood, but offers a much higher level of durability and strength. (house siding 3 image by Psycience from

The James Hardie Co. produces a wide range of fibre cement siding products, ranging from lap siding boards to shingles. Though fibre cement siding is known for its strength and durability, it is still susceptible to damage under extreme conditions, especially if it was improperly installed. To repair HardiePlank siding, homeowners often have to remove and replace an entire board. Fortunately, this task is fairly simple and requires only basic tools and supplies.

Skill level:

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Things you need

  • Pry bar
  • Hammer
  • Sawzall or similar reciprocating saw
  • Replacement Hardieplank siding
  • Saw with carbide-tipped blade
  • Tape measure
  • Punch tool
  • Galvanised nails
  • Hardie ColorPlus Touch-up kit and applicator

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  1. 1

    Check your HardiePlank warranty before attempting any repairs on your own. This product often comes with a substantial warranty, and any repairs by the homeowner may void the warranty.

  2. 2

    Remove end caps or trim that may interfere with the removal of your damaged HardiePlank board. Pry this pieces gently away from the wall using a pry bar and then remove the nails and set them aside for reuse.

  3. 3

    Slip a pry bar under the siding that's in the row above the damaged section. Very gently, pull the siding away from the wall about 1 inch.

  4. 4

    Slide a Sawzall or similar cutting tool under the row of siding that you just pried away from the wall. Use this tool to cut any nails that are holding the damaged section in place. Once all nails are cut, pull the damaged section out by hand. You may also need to use your pry bar to help you remove the damaged piece.

  5. 5

    Find a new piece of HardiePlank siding that matches the finish on the section you removed. Cut this new piece to the correct length using a saw with a carbide-tipped blade. Use extreme caution when cutting Hardieplank, due to the silica dust it contains. Cut outdoors and wear a respirator to protect yourself.

  6. 6

    Place the replacement plank into position so it is in line with the rest of the row. You may need to use your pry bar to hold the row above away from the wall while you install the replacement section.

  7. 7

    Install 2-inch galvanised nails every 6 to 8 inches along the top of the boards. These nails should penetrate the bottom of the row above and then pass completely through the replacement board to the wall framing or sheathing behind the siding.

  8. 8

    Touch up the nail holes using a Hardie ColorPlus touch-up kit that matches your siding. Use the built-in applicator to apply paint to the nail holes and any other areas that need attention.

Tips and warnings

  • Beware of voiding your warranty by undertaking these types of repairs on your own.

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