Interior doors, commonly referred to as wooden doors, serve multiple purposes in our homes, including spatial division, room decoration, privacy protection, sound insulation, and windproofing. However, due to the lack of professional knowledge and the invisibility of the internal structure of wooden doors, homeowners often find themselves taking the wrong path. This guide from China Home Expo aims to provide a detailed overview of interior doors, their types, functions, and key considerations for selection.

Types of Interior Doors

Classification by Opening Method

1. Swing Door

l Single Swing Door: A single door that opens to the left or right around a hinge axis.

l Double Swing Door: Two equally wide doors that open in opposite directions from the same doorway.

l Dutch Door: A double door with unequal widths (the smaller door, called the "child door," is usually fixed at a few standard sizes like 300mm, 350mm, or 400mm).

2. Sliding Door

l Built-in Sliding Door: Slides within the door frame.

l External Sliding Door: Slides outside the door frame. These doors can be designed as double, triple, or even quadruple slides based on the width of the doorway.

3. Hidden Door

l The door panel is flush with the wall's decorative surface, achieving a visually unified appearance in terms of material, color, and design.

Key Properties of Interior Doors

Sound Insulation

The sound insulation effect of a wooden door primarily depends on its flatness, material density, filling material, and sealing strips. A flat door panel ensures a tighter seal with the door frame, enhancing sound insulation. Materials with higher density and specialized soundproofing materials within the door panel also contribute to better sound insulation. Additionally, U-shaped nylon sealing strips increase sealing performance by swelling when wind passes through the door.

Fire Resistance

Interior doors in China Home Expo are generally not designed for fire resistance, but they can incorporate materials with certain flame-retardant properties, such as fire-retardant veneer for the exterior and flame-retardant paint for the finish. Internal fillings like pearl wool can also add to the door's fire resistance, providing valuable time during emergencies.

Security

Interior doors are not intended for security purposes like exterior doors. However, their security can be enhanced through the use of anti-tamper hinges and locks (including electronic locks), which add a layer of relative safety.

Structure and Materials of Interior Doors

Components of Interior Doors

l Door Panel: Consists of a frame, filling, surface board, and exterior veneer.

l Door Frame: Includes door jambs, door stop moldings, and lintels.

l Hardware: Essential and functional hardware components.

Door Panel Construction

l Flat Door: A single decorative surface panel, covered with wood veneer or painted.

l Flat Carved Door: Decorative patterns or lines carved into the surface panel.

l Flat Inlay Door: Decorative wood lines inlayed into grooves on the surface panel.

l Flat Inlay Core Panel Door: A decorative core panel (wood or glass) inlayed and fixed with decorative strips.

l Framed Door: Constructed from independent vertical, horizontal, and capping frames, with a core panel inserted.

Materials for Door Surfaces

l Wood Veneer: Includes natural wood veneer, technology wood veneer, stained wood veneer, and smoked wood veneer.

l Other Materials: PVC film, PU decorative paper, melamine decorative paper, and various types of paint finishes.

Hardware and Measurements

Types of Hardware

Measuring Tools: Typically measured by designers, but basic measurement methods can be followed for initial estimates.

Importance of Accurate Measurements

While initial self-measurement may be possible, detailed considerations and professional advice are crucial for accurate door fitting.

Conclusion

Selecting the right interior door involves considerations beyond aesthetics. Understanding the types, properties, structures, and materials of interior doors is essential for making informed decisions. This guide aims to provide a comprehensive overview to help homeowners navigate the sometimes overwhelming process of choosing interior doors for their homes.

The China International Furniture Fair (Shanghai) will be held from September 9th to 12th, 2025 at the National Exhibition and Convention Center (Shanghai Hongqiao). This event is a great opportunity to explore the latest trends, innovations, and developments in the home furnishing industry. If you want to know more about the home furnishing industry, please visit the China International Furniture Fair (Shanghai) website for more information.

Source: Zhihu

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