How to Install Aluminum Post Insert?

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When it comes to reinforcing vinyl fences, aluminum post inserts are a popular choice. They provide the rigidity and strength that vinyl posts might lack under certain conditions, ensuring your fence can withstand strong winds and other external pressures. If you’re planning a DIY fence installation or repair, here’s a simple step-by-step guide on how to install an aluminum post insert.

Materials Needed:

  • Aluminum post insert
  • Vinyl fence post
  • Measuring tape
  • Level
  • Post hole digger
  • Gravel
  • Concrete mix
  • Water
  • Trowel
  • Saw (if cutting is necessary)


1. Measure and Cut: Start by measuring the length of your vinyl fence post. If your aluminum insert is longer, you’ll need to cut it to fit inside the post. Remember, the insert should not protrude from the top of the post.

2. Prepare the Post Hole: Using a post hole digger, dig a hole at your designated spot. The depth of the hole should be about a third of the length of the fence post. For better drainage and stability, add a few inches of gravel to the bottom of the hole.

3. Insert the Aluminum Post Insert: Slide the aluminum insert into the vinyl fence post. Ensure that it fits snugly. If necessary, you can use a rubber mallet to tap it gently into place. Be careful not to damage the vinyl post.

4. Place the Post in the Hole: Now, place your vinyl post (with the aluminum insert) into the prepared hole. Use a level to make sure the post is straight.

5. Pour the Concrete: Prepare your concrete mix as per the instructions on the bag. Pour the concrete into the hole around the post, filling it up to just below ground level. Use a trowel to slope the concrete away from the post for proper drainage.

6. Let the Concrete Set: Allow the concrete to cure for the recommended time (usually 24-48 hours) before attaching any panels or rails to the post. This will ensure the post is secure and ready to withstand the weight and tension of the fence.


By following these steps, you can successfully install an aluminum post insert into your vinyl fence post, enhancing its strength and stability. Keep in mind that every fencing project is unique, so modifications might be necessary based on your specific situation and the type of fence you’re installing. Always refer to the manufacturer’s instructions and consult a professional if you’re unsure. Happy fencing!


More Reading

Read this article on “What Is A Vinyl Post Stiffener Used For?” to see where you should install your aluminum inserts.

Where to Buy Aluminum Stiffener Posts?

H&J Fence Supply has you covered!  Give us a call at 856-595-4553 and we’d love to help you out!

You can also visit us at 675s Evergreen Ave Woodbury NJ 08097

You can see our reviews by clicking here.

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About the Author
Joe Migrala
Joe Migrala

Joe is the owner of H&J Fence Supply and has been in the fence industry for 8+ years.

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