Side Folding Door Installation Part 5: Guide to Post Types

contractor reviewing plans

Now that you’ve got the posts and curtain mounted in the door track, it’s time to attach the posts to the floor and/or wall.

From here the installation instructions diverge, as the installation method will depend on the type of post.

In order to use the correct installation method, you will need to compare each post to the diagrams below to determine what type it is. Here is a guide to the symbols we use in our descriptions for the different kinds of posts:

Side Folding Door Post Types

Here is what they look like from the side:

Side Folding Door Post Types - Elevation

Descriptions of the Different Types of Posts

These post types will be determined in the planning and design phase of door construction to meet the specific logistical and security needs of the facility.

Type 1: Wall Channel

A wall channel is, as the name suggests, always secured to a wall. It is a full-height aluminum channel that provides a receiving end for a hookbolt from a Hookbolt post.

Type 2: Hookbolt

HookboltHookbolt posts are named for the hookbolt lock they have. Because they secure to a wall channel, they don’t need a floor socket. Your Hookbolt post may potentially have a double hookbolt and/or an additional spring-loaded top lock, depending on design requirements. Additional top locks are helpful when the posts are over 14’ tall, as they add extra stability when the door is closed.

A hookbolt is one of the two options for a leading edge for a door.

Type 3: Bipart

A bipart post is a pair of posts that come together to seal the secured area. These are used when there is a need to separate the door into more manageable sections, or to split the door so they stack in two different wall pockets. For every 30 feet, side folding doors should have at least one bipart post.

They lock using a hookbolt, and have an added lock rod to keep the curtain in place. The lock rod is concealed from the public side of the door, and fits into a floor or counter socket. Double hookbolt and top locking is standard on doors over 14 feet in height but optional on shorter doors.

If there is an emergency egress door built into the security grille, it is usually between bipart doors so they can be easily found. The emergency exits can be either single door (as shown below) or two-door swing out as shown here.

emergency egress through security door

Type 5: Intermediate

Intermediate posts help keep the curtain structure looking crisp and uniform, and prevent people from getting under the security grilles. They are located approximately every 10 feet along straight sections of the door, but closer together on sweeping curves. For standard curves, they should be placed near the centre.

On curtains that secure the area above a counter, there should be intermediate posts no more than 6’ apart.

To keep the post in place, they are locked using either a spring-loaded lock rod that sinks into a floor socket. A simple cylinder or thumbturn provides easy unlocking.

Type 7: Top & Bottom

A top and bottom post is another option for the end of a door. Optional leading edge treatments include a rubber bumper, flange, or blank face. Rubber bumpers protect drywall from damage from the metal posts, and flanges prevent people from reaching around the post into the secured area.

Spring-loaded lock rods insert into a floor socket and the ceiling-mounted track. They can be unlocked with a keyed cylinder or thumbturn.

Type 9: Trailing

A trailing post is designed to be the final post in a door on the end that fits in the storage pocket. This end can travel freely, but only within the wall pocket – as the post self-locks into the permanent header and floor stops. When closed, a rear flange fills the opening on the sides of the posts to prevent anyone from reaching through the end of the door.

This type of post is secured inside the pocket, so no lock is needed.

Type 10: Fixed

A fixed post attaches a door permanently to a wall or other structure. No lock is needed for this type of post.

Helpful Hints

These tips will help you install your posts so that the curtain ends up looking crisp and professional, instead of saggy or billowing.

  1. It is essential to ensure Wall Channel posts are plumb and level. If not, the whole security curtain will need to pivot for the lock to fit. This not only looks sloppy but potentially created gaps at the floor level through which people could enter the secured area.
  2. Only install Bipart posts after Wall Channel Hookbolt posts, Top and Bottom Post, and Fixed End Post. Bipart posts are in the central sections of the security door, and require floor sockets to be drilled, so you want to eliminate any chance of these being in the wrong place.
  3. After the Bipart, install the intermediates
  4. Always install Trailing posts last, as there is a bit of latitude on placement and they can be used to take up any remaining slack.

Next – How to Install Wall Channel and Hookbolt Doors

In the next post, we’ll walk you through how to mount Wall Channel and Hookbolt post types. If you need them, we have a copy of the complete installation guide available as a PDF.

Meanwhile, if you have any questions about installing your security grille, just call our expert Customer Service team at 1-800-663-4599.
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