Stringer Staircase Detail Dwg: Double

Riser plate welded or bolted between treads (if steel).

Handrail post anchored to stringer top flange.

In architectural and structural engineering, the staircase serves a dual purpose: it is a means of vertical circulation and a significant design element. Among the various structural configurations, the double stringer staircase—characterized by two parallel structural supports running along the sides of the treads—offers a balanced solution that is structurally robust yet visually lighter than traditional bulkhead or concrete stairs.

The focus of this paper is the translation of this structural system into technical drawings (DWG). A proper DWG detail is not merely a visual representation; it is a legal and instructional document that dictates fabrication tolerances, material specifications, and connection logic.

❌ 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.

A double stringer staircase uses two inclined beams (stringers) – one on each side of the treads/risers – to support the steps. The treads span between the two stringers.

Common materials:

Key advantage: Open look (no central stringer), suitable for widths up to ~1200 mm (48″). double stringer staircase detail dwg

Assume we are creating a steel double stringer staircase with open (cut) stringers, 42" wide, supporting concrete-filled metal pan treads.

| Drawing Sheet | Content | |---------------|---------| | A-101 | Plan & Section (1:20) | | A-102 | Cross-sections & Connection details (1:5, 1:10) | | A-103 | Material list, weld map, bolt schedule |

What is a Double Stringer Staircase?

A double stringer staircase is a type of staircase that uses two side stringers, each supporting the treads and risers, instead of a single central stringer. This design provides additional structural support and is often used in modern architecture.

Key Components of a Double Stringer Staircase: Riser plate welded or bolted between treads (if steel)

Detailing a Double Stringer Staircase in DWG:

When creating a double stringer staircase detail in DWG (AutoCAD), you'll want to include the following:

Example DWG Detail:

Here's a simple example of a double stringer staircase detail in DWG:

  +---------------------------------------+
  |                  Stringer               |
  |  (2) 12" x 1/2" x 10' long,          |
  |  steel, welded to newel posts         |
  +---------------------------------------+
  |  Tread  |  Riser  |  Tread  |  Riser  |
  |  (12" x 1" x 48" long,  |  (7" x 1" x  |
  |  wood)                |  48" long, wood) |
  +---------------------------------------+
  |                  Newel Post            |
  |  (4" x 4" x 10' long, steel)         |
  +---------------------------------------+
  |  Handrail  |  (2" x 2" x 10' long,  |
  |  steel, welded to newel posts)      |
  +---------------------------------------+

DWG Drawing Tips:

When creating a double stringer staircase detail in DWG, keep the following tips in mind:

If you'd like a more detailed example or specific guidance on creating a double stringer staircase detail in DWG, feel free to ask!

Would you like me to provide:

This is the heart of the DWG. It cuts vertically through one stringer and shows:

For concrete stringers: use 25–30 MPa concrete, design as inclined beam with main tension reinforcement along bottom, stirrups for shear. A double stringer staircase uses two inclined beams

Stringer Staircase Detail Dwg: Double

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