The goal when measuring your jamb for our exterior steel center split bi-fold doors with thermal break is to get the measurement from the outermost finishing of your exterior (stucco, brick, concrete, wood, etc.) to the face of the drywall inside. To get this measurement, make sure that you're including all parts of the building materials and the finishings.

Bi-Fold Doors

In-Swing

Out-Swing

These exterior steel center split bi-fold door with thermal break thresholds are made from a mix of cold-rolled steel and Jansen thermal break materials. These thermal break models are recommended for more extreme conditions where the temperatures drop to 27 degrees Fahrenheit or below. An aluminum u-channel is integrated into the threshold of these bi-fold doors, stabilizing the lower guide pin rollers and allowing the doors to fold smoothly.

These exterior steel center split bi-fold doors with thermal break are pre-hung and include the door panels and broken down frame (packaged separately for ease of transport and installation). The frame is assembled via bolts that are included with your order. A top cover cap is also included to hide the top rolling hardware on the upper portion of the frame. The jamb size is measured at 6” deep (net size) and made from a mix of cold-rolled steel and Jansen thermal break materials. Custom jamb sizes are available via our made to order section.

These exterior steel center split bi-fold doors with thermal break come standard with modern bullet hinges, and include a screwed in grease fitting, allowing you to maintain and grease the hinges regularly via a standard grease gun. 

One copper crush washer per hinge is included and required prior to hanging the door onto the frame. These washers protect the hinges by introducing a softer copper metal between the 2 hinge components in order to absorb the friction and allow the doors to swing smoothly. This hinge system is far superior to ball bearing systems, as the bearings are made of stainless steel, which is a harder metal inside a steel barrel, causing wear to both components and sagging over time.

These exterior steel center split bi-fold doors with thermal break include all necessary rolling / hinge hardware for the doors to function. Below is a list of parts included with all these center split bi-fold doors with thermal break.

An astragal is the welded component on the doors that provide a seal preventing exterior elements such as air and light from penetrating into the home. These steel exterior center split bi-fold doors with thermal break come equipped with an astragal on each door panel, ensuring a tight seal and preventing exterior elements from entering your interior space, adding to the efficiency of the doors.

These steel exterior center split bi-fold doors with thermal break come standard with dual foam weather stripping. This weather stripping comes pre-installed around the entire frame of the door, as well as down the full length of the astragals. This full suite of weather stripping acts as a barrier from outdoor elements and helps prevent cold or hot air from leaking out of the home, resulting in a much more energy efficient product.

These steel exterior center split bi-fold doors with thermal break come with pre-installed rubber door sweeps at the bottom of each door leaf. These door sweeps create a tight seal between the threshold and the door leafs themselves, preventing outside elements from entering your home. This simple yet effective feature helps insulate your space, improving energy efficiency.

These steel exterior center split bi-fold with thermal break doors come filled with a polyurethane foam core, which acts as a sound deadening material, and also provides some insulating properties for better energy efficiency. The foam also helps prevent moisture from accumulating inside the steel tubes, contributing to the door's longevity.

These steel exterior center split bi-fold door with thermal break models feature a welded 3” nailer fin around the frame of the door, and is designed to be installed from the exterior of your space. This nailer fin is inset to allow for a 1/2” of finish work on the exterior of your home, and includes pre-drilled holes around the entire face of the fin.

These steel exterior center split bi-fold door leafs come standard at 2 1/8” thick, providing both security and durability. Keep this thickness in mind when sourcing locks, as some locks will not be compatible with a 2 1/8” thick door without the inclusion of a thick door kit (based on lock manufacturer's availability).

Steel doors offer many more enhanced security features when compared to their wood, fiberglass, vinyl, or aluminum counterparts. These steel exterior center split bi-fold doors with thermal break are made a mix of cold-rolled steel and Jansen thermal break materials, which includes a galvanized protectant to help prevent rust and corrosion. These thermal break door models feature a carbon-like thermal barrier that is used to interrupt this transfer of cold, preventing the cold air from penetrating to the interior of your home, resulting in a more energy efficient product.

How do I measure my jamb?

The goal is to get the measurement from the outermost finishing of your exterior (stucco, brick, concrete, wood, etc) to the face of the interior drywall.

How thick are your exterior steel center split bi-fold door jambs? 

These exterior steel center split bi-fold door with thermal break jambs come standard at 6” thick. Custom jamb sizes are available via our made to order section.

Is the jamb the same thing as the frame? 

The jamb refers to the vertical components of the overall door frame. The jamb size refers to the thickness of those vertical components.

How does the frame mount to the wall? 

These steel exterior center split bi-fold doors with thermal break feature a welded 3” nailer fin around the frame of the door, and is designed to be installed from the exterior of your space. This nailer fin is inset to allow for 1/2” of finish work on the exterior of your home, and includes pre-drilled holes around the entire face of the fin.

Is the jamb included with the door?

Yes, the jamb is a component of the frame, which is made specifically for the door that it is packaged with.

Is the jamb/frame galvanized or zinc coated?

Yes, these exterior steel center split bi-fold doors with thermal break jambs and frames are treated with a galvanized protectant to help prevent rust and corrosion.

How is the jamb insulated?

We use a polyurethane foam filling in our exterior steel center split bi-fold doors with thermal break jambs for sound deadening purposes, which also provides some insulating properties.