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1.How do I make the cantilevered stone stairs step?

By observing the case pictures, stone stairs can be inferred that the finished surface thickness of the stone step is about 70~80 mm, and the bottom of the step is similar to the material of aluminum plate or stainless steel plate. So, how should this stone step be made? We can analyze it from the following two aspects:

1.1 How is the standard atlas of stone steps made?

• This method is to first plant reinforcement on the steel structure to increase the reliability of the base layer for easy bonding, then level it with cement mortar, and finally stick the stone with glue to achieve a stable effect.
• Under normal circumstances, the stone is 2 cm, the glue bonding layer is at least 0.8 cm, and the mortar layer is at least 1.5 cm; the minimum finished surface thickness can be about 5 cm.
• Although it is possible to follow the standard atlas in principle, we do not recommend this method.

Only the two connection points connecting the steel structure of the stone stairs and the wall are stressed, which is easy to shake. As long as the steel plate shakes, the cement mortar layer will inevitably crack.

1.2 What is the correct way to do the stone step in this case?

• Through the standard drawing, we can see that the stone and the base are directly bonded together by adhesive, and its base only needs to be flat and strong.
• According to the spatial scale, it can be inferred that the thickness of the step is ≤80 mm. Because the cantilevered step skeleton is made of steel,it is recommended to use flame-retardant boards and steel plates as the base and bond the stone with stone glue to achieve the effect of reducing the thickness of the finished surface.

•  Use plywood or wood board instead of a cement mortar leveling layer. The plywood can be directly fixed to the steel plate with nails without grouting, and the construction cycle is fast, so there is no fear of bumps during the process.

2.What should be paid attention to in the design of steps?

After we understand the craftsmanship of cantilever steps, there is still a part of the staircase specifications that we need to focus on. These are mainly divided into the following three aspects:

2.1 Pay attention to the aspect ratio of steps.

The aspect ratio of stone stair steps will have different requirements in different functional spaces, such as: kindergartens require stone stair step width ≥ 260 mm, height ≤ 150 mm; office buildings require step width ≥ 260 mm, height ≤ 170 mm.

Therefore, the aspect ratio of steps should be reasonably arranged during design.

2.2 The step surface should be non-slip.

In spaces with large traffic, it is important to pay attention to non-slip treatment. Steps made of materials such as stone, wooden floors, or ceramics can be made in the form of surface grooves or inlays, while glass step styles cannot be cantilevered in this way.

2.3 Stone stairs form selection .

There are strong regulations in the specifications. In public places where young children and the elderly often move around, the stone stair-step style cannot be cantilevered in this way.

3. Are there any specific specifications for the stairwell’s groove handrail?

We can see from the case photographs that the stone stair railing is a concave groove handrail. What details about the handrail’s dimensions and specs should we be aware of?

• The groove serves as a kid-friendly low-pull railing. According to the specification, the stone stairs handrail’s height cannot be lower than 900 mm. However,to make it easier for certain groups, such as the elderly and small children, to grab, the low-pull handrail should be between 600 and 650 mm.

• The stone stairs handrail’s diameter, which is best suited for domestic gripping, is between 50 and 80 mm, according to ergonomics. Consequently, when creating, user comfort should be a priority.

HRST STONE(CENTURY STAR)Marble stair show

Frequently Asked Questions

1. What are the primary design advantages of cantilevered stone stairs?

Cantilevered stone stairs, also known as “floating” stairs, offer a minimalist and airy aesthetic that creates a sense of openness in modern architecture. By fixing each step directly into a reinforced wall without visible supports, they transform a functional staircase into a dramatic piece of structural art that allows light to flow freely through the space.

2. Which types of natural stone are best suited for cantilevered steps?

Durability and structural integrity are key for floating steps. High-density stones like Granite and Quartzite are exceptionally strong choices. However, for a more luxurious feel, marbles like Calacatta or Carrara are frequently used. At Century Star, we often reinforce marble steps with internal steel supports or carbon fiber to ensure maximum safety and load-bearing capacity.

3. How is the safety and stability of a floating stone staircase ensured?

The safety of a cantilevered staircase relies on expert engineering. Each stone step is anchored into a heavy-duty steel stringer hidden within the wall. We meticulously calculate the weight of the stone and the expected live load to ensure zero deflection. Additionally, we recommend a minimum step thickness of 60mm to 80mm for both visual balance and physical strength.

4. Can LED lighting be integrated into cantilevered stone steps?

Yes, integrating LED strips is a hallmark of luxury cantilevered design. Lighting can be installed in a recessed groove beneath the “nose” of each step or along the wall-side. This not only enhances the “floating” effect by creating soft shadows but also improves safety by clearly defining the edges of the steps in low-light conditions.

5. What maintenance is required for stone stairs in high-traffic areas?

To keep stone stairs looking pristine, clean daily with a soft micro-fiber cloth and a pH-neutral stone cleaner. For safety, we recommend a honed or leathered finish to provide natural slip resistance. Century Star suggests professional sealing every 12 months to protect the stone from moisture and wear, especially on the leading edges of the steps.