Know the Right Terms for Door Parts to Make Hardware Installation Easier to Understand

Doors play a fundamental role in our daily lives, offering security, privacy, and access between spaces. Whether it's an entry door, interior door, or a closet door, understanding the various components and terminology associated with doors can be beneficial, especially when you’re upgrading or changing out hardware for a renovation project or historic restoration.

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Key Door Parts

Before we delve into the terminology, let's review the key components that make up a door:

• Door Frame: The framework that surrounds and supports the door, consisting of two vertical jambs (side pieces) and a horizontal head jamb (top piece).
• Door Leaf/Panel: The actual swinging or sliding part of the door, which can be made of various materials such as wood, metal, fiberglass, or glass.
• Hinges: The hardware that attaches the door leaf to the frame, allowing it to swing open and closed.
• Strike Plate: A metal plate affixed to the door frame, which the door latch engages with when the door is closed.
• Latch: The mechanism on the edge of the door leaf that extends into the strike plate to keep the door closed and aligned with the frame.
  
  
  
• A tube latch functions the same way but has a cylindrical shape.




• A mortise lock is a type of door lock where the latch fits into a pocket cut into the edge of a door.
• Knob/Lever Handle: The handle used to operate the latch and open or close the door.
• Door Stop: A thin strip of wood or metal attached to the door frame to prevent the door from swinging too far and damaging the wall.

Common Door Terminology

Understanding door terminology will help you understand assembly instructions and communicate effectively with professionals during the door selection process. Here are some common terms:

• Jamb: The vertical sides of the door frame, also referred to as the "door frame legs."
• Header: The horizontal top part of the door frame that spans between the two jambs.
• Rough Opening: The framed opening in a wall where the door will be installed, including the space required for the door and its frame.
• Casing/Trim: The decorative molding around the door frame that covers the gap between the frame and the wall.
• Threshold: The bottom part of an exterior door frame that forms the entrance's bottom seal.
• Astragal: A vertical strip that seals the gap between a pair of double doors.

How to Measure a Door

Accurate measurements are crucial when replacing or installing a new door. Follow these steps to measure your door correctly:

• Height: Measure the height from the top of the door to the bottom, along the vertical edge. Measure at the left, center, and right of the door, and use the shortest measurement.
• Width: Measure the width of the door from one side to the other, along the horizontal top edge, and then at the middle and bottom. Use the narrowest width as your final measurement.
• Thickness: Measure the thickness of the door leaf. Most interior doors are around 1 3/8 inches thick, while exterior doors are typically 1 3/4 inches.
• Rough Opening: Measure the width and height of the rough opening in the wall where the door will be installed.

Understanding door parts, terminology, and how to measure doors accurately is essential for successful door replacement or installation projects. By familiarizing yourself with the key components and following precise measuring techniques, you'll be better equipped to choose the perfect door for your needs and ensure a seamless installation process.

Know the Handing and Backset Before Choosing Door Hardware

Determining door handing and backset is crucial when selecting or installing door hardware like knobs, levers, locks, and latches. Let's break down each term and understand how to determine them:

Door Handing

Door handing refers to the direction in which a door swings or opens. To determine the door handing, follow these steps:





1. Stand on the side of the door where it swings away from you (the side where you would walk into the room).
2. Observe the location of the hinges: a) If the hinges are on your left, it's a Left-Hand (LH) door. b) If the hinges are on your right, it's a Right-Hand (RH) door.
3. For doors with a knob or lever handle, determine the handle side: a) If the handle is on your left, it's a left-hand inswing (LHI) door. b) If the handle is on your right, it's a right-hand inswing (RHI) door.

Note: Exterior doors may have a different handing when viewed from the exterior, so it's essential to specify whether you are referring to the interior or exterior side of the door.

What is Backset?

The backset refers to the distance between the edge of the door and the center of the borehole (the hole where the latch or lock is installed). Most residential door backsets are either 2-3/8 inches or 2-3/4 inches.






To measure the backset, follow these steps:

1. Close the door and locate the center of the borehole on the edge of the door.
2. Measure the distance from the edge of the door to the center of the borehole. It will be either 2-3/8 inches or 2-3/4 inches.

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Choosing the Correct Door Hardware:

Once you have determined the door handing and backset, you’re ready to select the door hardware, including knobs, levers, locks, and latches. Many products are reversible, meaning they can be installed on both left-hand and right-hand doors. However, some products are handed, which means they are specific to either left-hand or right-hand doors, so ensure you choose the correct one.

Remember to double-check your measurements and verify the handing before making any hardware purchases or installations. If you are unsure about the process, it's always best to consult with a professional or refer to the manufacturer's guidelines for accurate information.