Choosing the Perfect UPVC Door Knob: A Comprehensive Guide to Security, Aesthetics, and Functionality

When it comes to upgrading or replacing the hardware on your uPVC door, the door knob may seem like a small detail, but it's an essential one. The right door knob not only enhances the aesthetic appeal of your door but also plays a crucial role in security and functionality. This guide will walk you through everything you need to know to make an informed decision when selecting a uPVC door knob.

What is a uPVC Door Knob?

uPVC stands for unplasticized polyvinyl chloride, a material widely used in doors and windows due to its durability, low maintenance, and excellent thermal efficiency. Unlike wooden or metal doors, uPVC doors do not warp, rust, or require frequent painting. However, standard door knobs may not always be suitable for uPVC doors, so choosing the right knob tailored specifically for uPVC doors is crucial.

Types of uPVC Door Knobs

There are several types of uPVC door knobs available in the market, each offering different features and aesthetics. Here are the most common types used with uPVC doors:

1. Dummy Knobs: Decorative and non-functional, they don't turn or latch and are typically used on fixed doors where a locking or latching function isn't necessary.
2. Passage Knobs: Non-locking knobs that turn freely, ideal for doors that don't need security, such as between rooms.
3. Privacy Knobs: Come with a simple locking mechanism and are suitable for bathrooms or bedrooms.
4. Keyed Entry Knobs: Used on exterior doors, including main entrances, and offer key-locking mechanisms for added security.
5. Lever Handles: Technically not knobs but often more ergonomic and commonly used on uPVC doors, particularly in modern designs.

Security Requirements

When it comes to exterior uPVC doors, security is paramount. Always look for door knobs that comply with recognized security standards such as BS3621 or PAS 24 (UK standards) or ANSI Grade 1 or 2 (US standards). A multi-point locking system is common in modern uPVC doors, so your chosen knob must be compatible with this system. Many uPVC doors already come with lever handles that activate multi-point locks, so if you're replacing the hardware, ensure the new knob or handle does not compromise this feature.

Backset and Bore Hole Size

The backset is the distance from the edge of the door to the center of the bore hole (where the knob mechanism is installed). uPVC doors often have specific dimensions, so it's crucial to measure the existing hardware setup before purchasing a new knob. Common backset sizes include 60mm (2 3/8 inches) and 70mm (2 3/4 inches). Check the bore hole diameter as well—standard knobs usually require a 2 1/8-inch hole, but some uPVC doors have non-standard sizes. If your door has a unique configuration, you might need an adapter plate or a custom solution.

Material and Finish

Door knobs come in various materials and finishes that not only influence aesthetics but also durability. For uPVC doors, the best options are those that resist weathering and corrosion. Common materials include:

1. Stainless Steel: Rust-resistant, durable, and great for exterior use.
2. Brass: Offers a traditional look but may require maintenance.