Generally, the rough opening of the folding door should be 2 inches wider and 2 inches taller than the door itself, regardless of the size of the folding door. Origin has a folding door size calculator that details the manufacturer's standard maximum width for folding door panels, which is 420 to 780 inches or 35 to 65 feet. The minimum width is 16 inches for an odd number of doors and 28 inches for an even number of doors. The maximum height is 120 to 145 inches, or 10 to 12.08 feet.
The approximate opening of a folding door is approximately 50.8 mm higher and 50.8 mm wider than the door itself, regardless of the size of the folding door. Most folding doors don't come with a jambs or timber kit. Therefore, a well-sized opening will allow you to install a jamb or wooden extension on your door. If the door opening is smaller or larger than the previous readings, you will have to choose a custom-made folding door.
They are generally 2090 mm (6.85 ft) or 2100 mm (6.89 ft) tall, which is slightly higher compared to standard internal folding doors. You should always check with the manufacturer or product specifications to confirm the approximate opening requirements for your particular folding doors. Therefore, the finished opening of the folding door must be 1.5″ narrower than the rough opening of the folding door, due to the installation of the finished moldings. Typically constructed from a layer of panels that fold against the wall like an accordion, a folding door can be incredibly convenient for homeowners who want to create more space in their homes.
Keep in mind that most folding door sets don't come with a door jamb kit, so it's quite common to use select ¾ thick wood to create the finished door frame. The foldable ones are sold in pairs, with two doors that fold on one side or four parts in the center with two doors that fold back on both sides. Remember that the approximate opening should be 1 inch higher and 2 inches wider than the total measurements of folding doors. Architecture Lab states that folding doors are also known as folding sliding doors, accordion doors and room dividers.
It is important to have accurate readings when measuring folding doors, as any slight error could cause problems during installation. In general, the finished opening should be 1 inch higher than the doors for hardware installation and free opening space. If you already have an old folding door installed, you won't be able to measure the space accurately. You'll need to figure out the final opening size of folding doors to calculate the maximum width of folding doors that your space will allow.
The type of folding door you want to install in your home will determine the size of the finished opening. This finished opening size for a folding door will allow you to install a door jamb kit or use select ¾ thick wood to create the finished door frame.
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