• Description
• 20 Mar, 2025
• OZ Metal Fabrication

Guide to Designing and Installing Mono Stringer Staircases

Mono stringer staircases are a popular choice for modern homes and commercial spaces due to their sleek, minimalistic design and open, airy appearance. Unlike traditional staircases that have two stringers on either side to support the treads, mono stringer staircases utilise a single central stringer, creating a striking visual effect. If you’re looking to design and installing a mono stringer staircase, this guide will walk you through the essential steps, from design considerations to installation tips.

What is a Mono Stringer Staircase?

A mono stringer staircase is a type of staircase supported by a single central stringer. The stringer acts as the backbone of the staircase, supporting the treads (steps) on both sides. This design gives the staircase a more open, airy, and contemporary feel compared to traditional multi-stringer staircases. The central stringer is often made from materials like steel, wood, or reinforced concrete to provide adequate support.

Benefits of Mono Stringer Staircases

Before diving into the design and installation process, it’s important to understand why a mono stringer staircase might be the right choice for your project. Here are some benefits:

1. Aesthetics: Mono stringer staircases are visually striking and add a sense of elegance and modernity to any space.
2. Space Efficiency: With only one central stringer, this design can help save space and make your room feel larger.
3. Open Design: The exposed sides of the staircase create an open look, making it perfect for spaces where you want to enhance light flow and visibility.
4. Versatility: They can be customised in various materials such as wood, metal, or glass to match the interior style of your home or building.

Designing a Mono Stringer Staircase

Designing a mono stringer staircase requires careful planning to ensure both functionality and safety. Here are the key steps to consider when designing your staircase:

1. Determine the Dimensions and Layout

The first step in designing a mono stringer staircase is to determine the height (rise) and depth (run) of the staircase. You need to know how many steps the staircase will have and the total rise from the lower floor to the upper floor.

• Rise: The vertical distance between the two floors.
• Run: The horizontal distance between the start and end of the staircase.

The standard rise for each step is typically between 7-8 inches (175-200mm), and the run is usually between 9-11 inches (225-275mm). Use these measurements to calculate the number of steps needed for the staircase.

2. Choose Materials for the Stringer and Treads

The material you choose for the central stringer and the treads will affect the overall look and durability of the staircase. Here are some options:

• Wood: Provides a warm, natural look and is commonly used in residential settings.
• Steel: Offers a sleek, industrial look and is often used in modern or commercial settings. Steel can be painted or finished to suit different design aesthetics.
• Glass: For a truly contemporary look, some designs incorporate glass for the treads or sides, enhancing the staircase’s transparency and elegance.

3. Consider the Type of Support

The single central stringer needs to be strong enough to support the treads. Depending on the material and weight of the staircase, you may need additional support, such as:

• Welded steel support brackets: For added strength.
• Cantilevered design: Where the steps appear to float, often seen in modern designs.

4. Designing the Landing (If Applicable)

If your staircase has a landing or turns, the design will need to accommodate that. The landing should be wide enough to allow for comfortable movement and the transition from one flight to another.

5. Safety Features

Ensure the staircase design includes safety features like proper railing height, non-slip tread surfaces, and secure fastening for the stringer and treads.

Installing a Mono Stringer Staircase

Installation of a mono stringer staircase can be complex and may require professional assistance, especially when it comes to working with heavy materials like steel or ensuring proper structural integrity. However, if you have the right skills and tools, you can take on the task yourself. Here’s a basic step-by-step guide to installation:

1. Prepare the Site

Before beginning the installation, ensure that the space is properly prepared. This includes:

• Clearing the area: Remove any obstructions.
• Leveling the floor: Make sure the floor at both the top and bottom of the staircase is level.
• Marking the layout: Use chalk or a laser level to mark the locations for the stringer and treads.

2. Install the Central Stringer

The central stringer is the core support of the staircase, and its installation is the most critical part. Here’s how to install it:

• Position the stringer: Place the stringer in its designated location, ensuring it is level and properly aligned with the marked layout.
• Secure the stringer: Depending on the material, this may involve bolting it into place (for steel) or securing it with brackets (for wood).
• Check for stability: Once the stringer is secured, check for any movement to ensure it is fully stable before proceeding.

3. Attach the Treads

Once the stringer is securely in place, you can begin attaching the treads. For a floating look, the treads may be attached with hidden supports or brackets.

• Align each tread: Start at the bottom and work your way up. Use a level to ensure each tread is properly aligned.
• Secure each tread: For wood or composite treads, you may use screws or brackets, while for steel or concrete treads, welding or bolting may be necessary.

4. Install the Handrails or Balustrades

After the treads are in place, you can install the handrails or balustrades for added safety. Ensure they are installed at the proper height (usually between 34-38 inches) and are securely fastened.

• Attach the handrails: Use metal brackets or wood supports to attach the handrails to the stringer or walls.
• Install balustrades: If using balustrades, space them evenly for a balanced look.

5. Final Check and Finish

Once the staircase is fully assembled, perform a final inspection:

• Check for stability: Ensure that all steps are secure and the stringer is properly fastened.
• Finish the surface: Sand down any rough edges or imperfections and apply a finish (paint, varnish, or sealant) to protect the materials.
• Test the stairs: Test the staircase by carefully walking up and down to ensure it’s safe and stable.

Conclusion

Designing and installing a mono stringer staircase is a great way to bring a modern, stylish touch to your home or commercial space. By carefully considering the design, choosing the staircase builder, and following a step-by-step installation process, you can create a staircase that is both functional and aesthetically pleasing. While installation can be a complex task, with proper planning and attention to detail, you can achieve a beautiful result that will last for years to come.