How to Make Curved Stair Treads

Designing and fabricating curved stair treads requires precision, careful planning, and craftsmanship. While it’s a complex project, the following step-by-step guide will provide you with a general overview of the process involved in making curved stair treads. Please note that this is a simplified explanation, and it’s recommended to consult professional resources or experts for more detailed instructions.

How to Make Curved Stair Treads Step by Step

Materials and Tools You’ll Need:

• High-quality hardwood boards (preferably 1-inch thick)
• Measuring tape
• Pencil
• Flexible curve ruler or bendable plywood strips
• Jigsaw
• Bandsaw
• Planer
• Router
• Sandpaper (multiple grits)
• Wood glue
• Clamps
• Finish of your choice (stain, varnish, or paint)

Step 1: Measurement and Template Creation

1. Measure the width and length of your staircase accurately.
2. Create a template for the curved stair treads using a flexible curve ruler or bendable plywood strips.
3. Ensure the template accurately represents the desired curve and dimensions of your staircase.

Step 2: Tracing and Cutting

1. Place the template on the hardwood board and trace the curved shape onto it using a pencil.
2. Cut along the traced lines using a jigsaw or bandsaw, following the shape as closely as possible.
3. Make smooth and precise cuts to achieve the desired shape for the curved stair treads.

Step 3: Shaping and Smoothing

1. Use a router with a flush-trim bit to refine the edges and shape of the curved stair tread, ensuring smoothness and consistency.
2. Run the curved stair tread through a planer to achieve a uniform thickness.
3. Sand the entire surface of the tread using progressively finer grits of sandpaper until it’s smooth to the touch.

Step 4: Riser Groove (Optional)

1. If your design includes risers between the curved treads, create a groove on the underside of the tread to accommodate the riser.
2. Use a router to carefully carve out the groove, ensuring it matches the dimensions of the riser.

Step 5: Assembly and Installation

1. Apply wood glue to the top of the risers or directly to the staircase stringers.
2. Carefully place the curved stair treads in their designated positions, aligning them properly.
3. Secure the treads firmly using clamps and allow the glue to dry completely.
4. Ensure that the treads are securely fastened and level before proceeding.

Step 6: Finishing Touches

1. Perform a final sanding on the curved stair treads to achieve a smooth surface.
2. Apply the finish of your choice, such as stain, varnish, or paint, to enhance the appearance and protect the wood.
3. Follow the manufacturer’s instructions for applying and curing the chosen finish.

What Is the Minimum Tread Depth for A Curved Staircase?

The minimum tread depth for a curved staircase depends on the building codes and regulations of the specific jurisdiction where the staircase is being constructed. Building codes aim to ensure safety and comfort for users, so they often provide guidelines for minimum tread depth.

In general, the minimum tread depth for curved staircases is similar to that of straight staircases, typically ranging from 9 to 11 inches (23 to 28 centimeters). However, due to the curved nature of the staircase, the tread depth may vary along the curve. It is common for the tread depth to be deeper at the center of the curve and gradually decrease towards the ends of the treads.