Colorbond Fencing Installation


If you have chosen to use Colorbond fencing to line your property, proper installation can be confusing at times; instructions that come with the fencing materials are sometimes vague. Installing Colorbond fencing correctly is important to maintain the durability and strength of the prepainted steel fencing.

Things You'll Need

  • Tape measure
  • Marker stakes
  • Rubber mallet
  • String
  • Safety goggles
  • Tin snips
  • Shovel
  • Level
  • Quick-setting concrete mix
  • Concrete mixer
  • Temporary brace boards
  • Circular saw
  • Power drill
  • Screwdriver bits
  • Pencil
  • Hoe (optional)
  • Screws, self-drilling (included)

Ground Preparation

  • Add the marker stakes to mark the post holes. Start at the beginning of the area where you are installing the fencing, such as on one side of the house. Place a marker stake into the ground. Tie one end of the string line around the top of this starter post.

  • Measure the width of a whole fencing panel. Measure this distance from the starter stake, place another marker stake into the ground and wrap the string line around the second stake, connecting the stakes together.

  • Repeat measuring, adding marker stakes and tying string line until you reach the end stake section.

  • Measure the distance from the stake before the end stake section to the end of the fence. Add the final stake, tie the string line and cut the extra line off.

  • Mark the measurement of the final section on a fence panel and cut with tin snips. Set the panel aside.

Placing the Posts

  • Dig the post holes 12 to 36 inches in from the stakes. Colorbond recommends that the depth of the post holes should be as follows: for rock--12 inches, for hard soil (clay)--24 inches and for soft soil (sand)--35 ½ inches.

  • Place the posts into the holes, one at a time. Use the level to adjust the posts until they are level. Corner posts have two open ends on either side of a closed middle section, while end posts have an open section on one side of a closed section. The open ends hold the panels. Add a temporary brace to each post to hold it in place and level.

  • Mix the concrete as the packaging directs. Follow the manufacturer's operation instructions for the concrete mixer.

  • Add the concrete mix to the post holes, around the posts. Mound the concrete about 1 inch to 1 ½ inches above ground level.

  • Slope the concrete, using the spade, downward from the post to the ground to prevent water damage. Allow the concrete to cure for the amount of time described on the packaging, first attaching the rails to ensure that the posts are in the correct position when the concrete sets.

Assembling the Fence

  • Add the bottom rails to each section. The rails should sit about 2 inches above the ground. Secure the rails in place using the supplied self-drilling screws and the power drill with appropriate screwdriver bit.

  • Measure and mark the bottom rail for the end section to fit the width between the last two posts. Cut using the circular saw and attach in the same manner as the other bottom panels.

  • Add the top rails to each section. The top rail should stick up about ½ inch above the top of the posts. Temporarily secure the top rails in place with self-drilling screws, but do not tighten; you will be removing them.

  • Measure, mark and cut the top rail for the end section as you did for the bottom rail. Attach in the same manner as the other top rails.

  • Remove the screws and rails from the top after the concrete has cured. Slide the panel sections into place using the grooves in the posts. The panels should rest in the groove in the bottom panel. Use the rubber mallet to help when needed.

  • Place the top rails back into position, making sure the top edge of the panels fit into the groove of the top rails. Replace the screws and tighten them completely.

Tips & Warnings

  • The amount of concrete you'll need depends on the type of soil you have; rock: 1 bag per post hole, clay/hard soil: 2 bags per post hole and sand/loose soil: 3 bags per post hole.
  • Place the marker stakes and string line about 12 to 36 inches out from where the posts will go. It's common to place stakes along the property line and install fencing just inside the line.
  • For uneven or sloping ground, Colorbond recommends raking the fencing--using the bottom rails as a measuring and installing aid--instead of uneven panel stepping.
  • Wear safety goggles to protect your eyes, especially while cutting.


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