Side Folding Door Installation Part 8: Installing Intermediate and Top and Bottom Posts

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This article is a part of an ongoing deep dive into security grille installation, designed to provide all the tips we’ve learned over the years. If you haven’t already gone through all the steps, please start here or alternatively consult the instructions PDF.

If you’ve followed all of the steps so far, you’ve got the track installed in your ceiling and have hung the curtain. You’ve also installed some of the post types already, depending on the type.

In this article, we’re going to show you how to install Intermediate and Top and Bottom Posts.

Intermediate Posts

Intermediate posts provide structural support to a security grille. They prevent intruders from lifting the curtain and gaining entry to the secured area, and they also help keep the overall look of the security grille looking crisp and even.

While all post types in your installation kit are clearly numbered and indicated in the installation diagram, here’s what intermediate post types look like for reference:

Intermediate Post

This diagram shows what Intermediate posts look like - a simplified view on the left and an elevation diagram on the right.

Step 1: Set Up all Other Posts

The general idea is that make sure everything is positioned correctly before you drill any holes, as these can be catastrophic, especially if you’re installing above a granite countertop.

Roll out the entire security grille and lock any previously installed posts in place. Allow the entire curtain to hang naturally - there should be fairly even tension throughout the curtain, and no visible slack.

Extending Security Door

A Note About Slack in Doors

While we do our best to create doors that are as close to the opening width as possible, we’re limited by panel width. Each panel is 6” wide, so sometimes there’s a small amount of overage in order to ensure the door meets both ends of the opening.

Bipart Posts

If your door has a Bipart post, which can only be installed after all other post types, ensure they’re locked and in position. Then install the Intermediate posts closest to where Bipart posts meet and work your way out, post by post, towards each wall or pocket. This will move any slack towards the walls, and help the overall security grille look as even and taut as possible.

Trailing Posts

If your door includes a trailing post, again, ensure that any slack in the door goes towards the end.


It’s important not to stretch the curtain too tight. If you do, the end user of the door will have to struggle to position the bolt for locking, and it will be difficult to open too. If the door is so tight that the bolt is slanted in the socket, it’s possible that damage to your door may occur.

Steps 2 and 3: Drill Hole and Install Floor Socket

You can get the full details on how to mark the location of the drop rod, drill the hole, and install the floor socket here.

Top and Bottom Posts

Top and Bottom posts are one of the options for securing the security grille to a wall. Because they don’t require the installation of a Wall Channel post, they’re a great way to preserve the clean look of the secured area. Top and Bottom posts can be fitted with soft ends like rubber bumpers to ensure that walls don’t get damaged.

Top and Bottom posts are so called because they have locks at the top and bottom of the post, whereas all other post types have bolts only at the bottom.

Top and Bottom Posts

This diagram shows what Intermediate posts look like - a simplified view on the left and an elevation diagram on the right.

Step 1: Position the Post

Place the post in its final position, and verify that it is hanging plumb. You may want to have someone hold it in place. If you don’t have someone else to help, you can alternately lock just the top or bottom to hold the post in place. This will leave the opposite end slightly free so you can mark the correct position.

Step 2: Marking the Top Hole

Marking and Drilling

The lock at the top of the post doesn’t require a socket; you’ll just be drilling through the track up into your ceiling header. We supply tracks that have stickers showing where holes are located:

Track Hole Sticker

Mark the location of the top bolt on the track. Drill a ½” diameter hole through the track.

Tip: To make it easier for the end user to find the location of the hole, mark where it is on the track. Because of the way the lock works, end users will need to lock the top lock first and then the bottom - a sticker on the post explains.

locking instructions sticker

Steps 3 and 4: Drill Hole and Install Floor Socket

You can get the full details on how to mark the location of the drop rod, drill the hole, and install the floor socket here.

Next in Our Series - How to Install Trailing Posts

We have a few more posts to go in our series. Our next post will cover installing Trailing posts, and in a future post we’ll also cover the adjustments you can make to the lock rod to help it engage smoothly (you can find this information on page 29 of the PDF instruction manual).

Meanwhile, if you have questions about installation of your security door, we encourage you to reach out to the experienced advisors at our customer support team. You can reach them at 1-800-663-4599 to ask any questions you may have.

Contact Customer Support by Email

Written by Jack Roy at 00:00


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