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Double Stringer Staircase Detail Dwg May 2026

The Architect's Guide to Double Stringer Staircase Details In modern architecture, the staircase has evolved from a functional necessity into a focal point of interior design. Among the most popular configurations for achieving a clean, structural look is the double stringer staircase

. Unlike a monostringer that uses a single central spine, a double stringer system utilizes two parallel beams to support the treads, offering a balance of architectural symmetry and superior stability. What is a Double Stringer Detail?

A double stringer (or dual stringer) system consists of two structural members—typically steel channels (UPN/C-channel), rectangular tubes, or timber beams—running along the outer edges or slightly inset from the sides of the treads. In a standard DWG detail , you will typically find:

When designing a modern interior, the double stringer staircase

is a go-to for architects looking for a balance between industrial strength and minimalist aesthetics. Unlike mono-stringers, the dual-beam support offers increased stability and allows for wider tread spans without the bounce often associated with single-support designs. Key Technical Details in a DWG File A professional-grade double stringer staircase detail DWG

typically includes several critical components for construction and fabrication: Stringer Profiles

: Often specified as steel channels (e.g., UPN260 or MC shapes) or rectangular hollow sections (HSS). The drawing will detail the specific pitch and cut of these beams. Tread Support Brackets

: Details on how the treads are mounted—whether they are "raised" on top of the stringers or "concealed" between them for a sleeker profile. Structural Connections

: Precise details of the top floor main beam connection and the ground floor foundation or starter plate. Material Transitions double stringer staircase detail dwg

: Specifications for the interface between the steel stringers and wooden or glass treads. Architectural Gallery

These visual references showcase various double stringer configurations, ranging from heavy timber frames to sleek, laser-cut steel designs.

Introduction

A double stringer staircase is a type of staircase that consists of two side stringers, also known as stringer beams, that support the treads and risers. This type of staircase is commonly used in commercial and industrial buildings, as well as in residential construction. In this content, we will provide a detailed overview of a double stringer staircase, including its components, design considerations, and a sample DWG drawing.

Components of a Double Stringer Staircase

The following are the main components of a double stringer staircase:

  1. Stringer Beams: These are the two side beams that support the treads and risers. They are typically made of steel, concrete, or wood.
  2. Treads: These are the horizontal steps that users walk on. They are typically made of wood, steel, or concrete.
  3. Risers: These are the vertical elements that connect the treads. They are typically made of wood, steel, or concrete.
  4. Landing: This is a flat platform that is provided at the beginning and end of the staircase, as well as at intermediate levels.
  5. Handrail: This is a railing that is provided on one or both sides of the staircase for safety.

Design Considerations

When designing a double stringer staircase, the following factors should be considered: The Architect's Guide to Double Stringer Staircase Details

  1. Load Capacity: The staircase should be designed to support the required load, including the weight of users, treads, risers, and stringer beams.
  2. Staircase Geometry: The staircase should be designed to fit the available space, taking into account the floor plan, ceiling height, and other architectural features.
  3. Safety: The staircase should be designed to meet safety codes and regulations, including the provision of handrails, landings, and non-slip treads.
  4. Aesthetics: The staircase should be designed to be visually appealing, taking into account the style and materials used.

Sample DWG Drawing

Here is a sample DWG drawing of a double stringer staircase:

DWG File Details

Drawing Content

The DWG drawing includes the following elements:

  1. Stringer Beams: Two side stringers, 200 mm wide x 10 mm thick, made of steel.
  2. Treads: 12 nos. of treads, 300 mm wide x 20 mm thick, made of wood.
  3. Risers: 12 nos. of risers, 150 mm high x 10 mm thick, made of wood.
  4. Landing: One landing, 1500 mm long x 300 mm wide, made of steel.
  5. Handrail: One handrail, 900 mm high, made of steel.

Drawing Views

The DWG drawing includes the following views:

  1. Plan View: A top view of the staircase, showing the layout of the stringer beams, treads, and risers.
  2. Elevation View: A side view of the staircase, showing the height and profile of the stringer beams, treads, and risers.
  3. Section View: A detailed view of the staircase, showing the construction details of the stringer beams, treads, and risers.

Design Data

The following design data is included in the DWG drawing:

  1. Stringer Beam Design: The stringer beams are designed to support a load of 500 kg/m².
  2. Tread and Riser Design: The treads and risers are designed to support a load of 200 kg/m².
  3. Landing Design: The landing is designed to support a load of 500 kg/m².

Conclusion

In conclusion, a double stringer staircase is a common type of staircase used in commercial and industrial buildings, as well as in residential construction. The design of a double stringer staircase requires careful consideration of load capacity, staircase geometry, safety, and aesthetics. The sample DWG drawing provided in this content illustrates the components and design details of a double stringer staircase.

DWG Drawing Files

Here are the DWG drawing files for the double stringer staircase:

Note: The DWG file can be opened using AutoCAD or other compatible software.

Mastering the Double Stringer Staircase: A Comprehensive Guide to Detail DWG Files

7. Common Mistakes to Avoid in DWG

❌ Missing nosing alignment – All tread nosings must line up on the stringer top edge.
❌ No landing beam support – Stringers must bear on a beam, not just a slab edge.
❌ Wrong stringer thickness – 6mm steel is too thin for >1m wide stairs.
❌ Ignoring torsion – Double stringers resist bending, but wide stairs may twist – add transverse bracing at mid-span if width > 1.5 m.
❌ No handrail attachment detail – Show welded tabs or drilled holes in stringer for railing posts.

Part 6: Case Study – A Real-World Application

Project: 3-story atrium staircase for a tech office in Austin, TX. Spec: 48" wide open steel double stringer, 14 risers, 16-foot span. Challenge: The architect wanted a "floating" look, but the building code required a 300 lbs/sq ft live load. Stringer Beams : These are the two side

The DWG Solution: