Side Folding Security Door Installation Part 7: Installing BiPart Posts

drilling concrete

This article gives instructions and tips for installing Bipart posts for your security grille. You should have already mounted the track to the ceiling and loaded all curtain sections and posts into the track. Start here if you haven’t already gone through these steps or alternatively download the instructions PDF.

Like the Wall Channel and Hookbolt posts, Bipart posts are actually a set of two posts (see the diagram below). The male Bipart post is essentially a Hookbolt post, and the female post is much like a Wall Channel.

Now that they’re in the track all that’s left to do is install the floor socket and ensure they lock correctly.

Important: only install bipart posts after all other post types have been secured to the wall or floor as needed.

Bipart Post Diagram

Diagram of a Bipart post, showing simplified top view on the left and side view on the right.

Step 1: Position and Lock Bipart Posts

Bipart Posts Pulled Together Security Door

Lock any other post types in your door and ensure they’re in the correct location. Ensure end posts are also locked.

Then, fully extend both sides of the Bipart door, and ensure they meet in the desired location. This is often in the centre of the door, but not always. Your custom drawing included with the door should give you exact measurements.

Step 2: Mark the Location of the Drop Rod

Once you’re sure that the Bipart doors meet in the correct location, find the female post (receives the lock, contains the drop bolt). You won’t be able to lower the drop rod while the two halves of the Bipart door are together (this is a security feature to prevent tampering), so mark the approximate location of the drop rod on the floor.

To double check that you have the correct location, unlock the Bipart and move the male post away. Lower the drop rod to the floor and mark the location of the drop bolt on the floor. You can either mark the centre or trace around the drop rod, whichever you’re used to.

Be Sure Your Hole Location is Correct

It’s important to take the time to ensure you’ll be drilling in the right location. While there is about ?” play, filling in an incorrectly positioned hole in a floor is difficult – in a granite countertop it’s effectively impossible without leaving an unsightly plug.

Drilling Hole for Floor Socket

Step 3: Drill the Hole for the Floor Socket

Depending on whether you’re drilling a hole in the floor or on a countertop, you’ll be drilling the hole at two different depths:

  • For floor socket: drill 3/4” diameter x 2-3/4” minimum deep
  • For countertop trim ring: 5/8” diameter x 1” deep minimum – but it should go all the way through the counter if any food preparation is going on in the secured area.

A Note About the Two Types of Sockets

floor socket and countertop trim ringCountertop trim rings have an open bottom to allow debris to pass through the socket and into a collection bin below the counter. This is prevents health issues in food preparation situations, because if staff are wiping the countertops and crumbs fall in.

Floor sockets have a spring-loaded cap that prevents the entry of most dust and debris. When the drop rod is lowered it simply pushes the cap down.

Adding socket to hole

Step 4: Insert the Socket into the Hole

You should be able to push the socket into the hole – use a rubber mallet if needed.

When using the mallet, tap straight down. Striking it at an angle or with too much force can damage the socket, so if it won’t go in ensure the diameter of the hole is correct. If needed, we can provide replacement sockets.

Next – How to Install Intermediate and Top and Bottom Posts

There are further adjustments you can make to the lock rod – that’s covered on page 29 of the PDF instruction manual. We’ll be covering it in detail in a later post.

Meanwhile, we have a few more post types to go, and then our series will be complete. Next up, we have instructions on Intermediate and Top and Bottom posts.

But don’t forget that you can always contact the specialist experts at our customer support team. These aren’t call-centre workers with no expertise; they been helping our customers for over a decade and their job is to get answers and solve problems. Get in touch with them at 1-800-663-4599 if your door installation presents any challenges or questions.

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