Explore 7 Different Types of Interior Door Threshold

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Have you ever noticed the wooden or metal strip at the bottom of interior door thresholds? That’s the door threshold, and its function goes beyond just aesthetics. From reducing noise and preventing drafts to enhancing accessibility and protecting floors, door thresholds play a crucial role in creating seamless transitions between rooms. They are an essential element in all modern homes and commercial spaces.

Door thresholds can be made from various materials such as wood, metal, or plastic, depending on the needs of the interior design and personal preferences. In modern residential design, some designers also opt for threshold-free designs to create a more open and barrier-free sense of space.

In this article, we will introduce you to 7 common types of interior door thresholds.

The 7 Main Interior Door Threshold Types

Wood Grain Door Threshold

Wood grain door thresholds are typically installed under bedroom doors to connect the flooring materials between hallways and bedrooms. They have a surface with wood grain patterns, allowing them to be paired with different floor patterns. Additionally, they can prevent pests such as cockroaches and flies from entering the bedroom, creating a comfortable resting space.

Flat Threshold

Flat thresholds, also known as “flush thresholds,” can be considered as “threshold-free.” They are the simplest type, typically smooth and seamlessly integrated with the floor. They can be made from various materials such as wood or metal, and can be painted or surface-treated to match surrounding decor. However, these thresholds are generally used for spaces with two equal-height surfaces.

Bumper Seal Thresholds

This type of threshold has a raised bumper at the top, typically made of rubber or other soft materials, which can complement the door’s bottom seal when the door is closed, providing additional sealing effect. This helps prevent the entry of air, dust, or moisture and also reduces noise. They are commonly used for outdoor entrance doors or other areas requiring a good seal.

Saddle Thresholds

Saddle thresholds are one of the most common types of thresholds, named for their shape resembling a saddle. This type of threshold presents an arch shape in cross-section, with the middle being higher than the ends. This shape helps provide stability and visually defines the boundary between different areas. Saddle thresholds are typically made of metal, offering durability to withstand wear and tear from foot traffic and items passing through.

During installation, the threshold is laid flat on the ground, with its ends snug against the left and right sides of the door frame. This ensures that when the door is closed, the bottom of the door makes contact with the surface of the threshold, reducing the likelihood of airflow and dust entering the interior.

Heavy Duty Thresholds

Heavy-duty thresholds are designed to withstand high traffic and heavy pressure, typically used in commercial or industrial environments such as warehouses where forklifts are utilized. They are usually constructed from sturdy and durable materials such as thick aluminum alloy, stainless steel, or brass. These materials can resist repeated foot pressure and possible impacts from heavy objects.

Moreover, heavy-duty thresholds are typically thicker and heavier than standard thresholds to ensure they maintain their shape and function under extreme conditions. To enhance slip resistance and durability, the surface of heavy-duty thresholds may undergo special treatments such as embossing or covering with non-slip materials.

Thermal Break Thresholds

Thermal break thresholds feature insulation material in the middle, designed to prevent heat or cold air from transferring through the metal under the door. In winter, they help retain indoor heat, while in summer, they help prevent external heat from entering. When there is a significant temperature difference between indoors and outdoors, they can effectively prevent condensation from accumulating on the threshold, reducing the risk of slipping.

These thresholds are particularly suitable for regions with large climate variations.

Floor Dividers

Floor partitions are components used to divide spaces or areas. These partition structures can be fixed or movable, functional or decorative. They come in various types to separate different flooring materials such as floorboards, carpets, wood panels, and tiles.

Floor partitions not only provide a clean visual division but also help prevent the spread of combustible flooring materials under doors.

Common Materials for Interior Door Threshold

Wood Material

Wooden door thresholds are a classic choice in interior design, customizable to various interior design styles. They can be stained, painted, or varnished to change their color and sheen. However, they require a certain level of maintenance, including regular cleaning and application of protective coatings to prevent damage from moisture and scratches.

Aluminum Alloy

Aluminum door thresholds are renowned for their lightweight, sturdy, and durable characteristics, making them highly suitable for modern and industrial-style interior decorations. They are unaffected by rust and corrosion, maintaining stability even in damp or chemically active environments. The surface treatment of aluminum alloy can vary, such as anodizing to increase wear resistance and aesthetics.

Stainless Steel

Stainless steel door thresholds are a modern and practical choice, especially in applications requiring high durability and hygiene. Its corrosion resistance makes it an ideal choice for kitchens, bathrooms, and other areas prone to moisture exposure. Despite the initial higher cost, its long-term durability and minimal maintenance requirements make stainless steel a wise investment in the long run.


Brass door thresholds are renowned for their elegance and exceptional durability. Their antimicrobial properties make them particularly valuable in medical facilities and other places where hygiene is crucial. They are easy to process and customize, corrosion-resistant, and require minimal maintenance.


Bronze door thresholds are favored for their weather resistance and timeless aesthetics. Being a heavy metal, bronze is sturdier than brass, making it particularly suitable for high-traffic entrance areas. Despite the higher cost of bronze, its durability and unique beauty make it a valuable investment in the long run.


A suitable interior door threshold can cleverly elevate the ambiance of your space while fulfilling its basic functions. Whether you desire the classical charm of wood grain, the contemporary elegance of flat thresholds, the protective seal of bumper seals, the durability of heavy-duty selections, the energy efficiency of thermal break bridges, or the clean division provided by floor partitions, each type offers a unique fusion of form and function.

As a professional threshold manufacturer, NIUYUAN can provide you with various types of thresholds to meet the requirements of your different projects. Feel free to contact us for the latest product catalog and samples.


Is it necessary to install an interior door threshold?

Yes, there are several important reasons for installing interior door thresholds. Firstly, they provide a smooth transition between two different flooring materials, which can prevent tripping and help protect the edges of the floor from excessive wear. Secondly, thresholds can help block airflow, increase sound insulation, and to some extent, improve energy efficiency. Additionally, interior door thresholds can serve as an element of interior design, adding aesthetic appeal. Overall, while not every doorway strictly requires a threshold, they are often a worthwhile addition in terms of both functionality and aesthetics.

What should I consider when choosing a door threshold?

When choosing a door threshold, factors to consider include the types of flooring on both sides of the door, foot traffic, the degree of exposure to moisture, desired aesthetics, and any special requirements such as accessibility or energy efficiency.

Can I install the threshold myself or do I need professional help?

Many door thresholds can be installed by capable DIYers using the right tools and instructions. However, for optimal results, especially for thresholds requiring precise alignment or specialized installation (such as thermal breaks), professional installation is recommended.

How do I measure the door threshold?