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Double Stringer Staircase Detail Dwg

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:

double stringer staircase detail DWG is a technical CAD drawing that provides precise structural and architectural specifications for a staircase supported by two parallel beams (stringers). These drawings are essential for fabrication and installation, detailing every component from material profiles to connection types. structuraldetails Key Components of a Double Stringer DWG

Detailed CAD files typically include these critical elements to ensure structural integrity and aesthetic alignment: Stringer Profiles : Often specifies steel sections like 100x100x9mm SHS (Square Hollow Section). Tread Details

: Shows how steps (e.g., 40mm wooden planks or steel plates) are mounted. Raised Treads

: Steps sit on top of the stringers, making them visible from the side. Concealed Treads

: Steps are mounted between or partially inside the stringers for a sleeker look. Support Connections Floor Foundation double stringer staircase detail dwg

: Uses baseplates (e.g., 300x320x12mm) secured with anchor bolts (like M20 Grade 8.8) and full penetration butt welds. Landing/Top Beam

: Illustrates the connection to main support beams (e.g., IPE300) using end plates and bolts. Dimensions and Geometry

: Includes floor-to-floor heights, riser/run calculations (typically 7" rise and 10-11" run), and total step count. Common Styles & Materials

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:

  • Stringers: Two side stringers, typically made of steel or wood, that support the treads and risers.
  • Treads: The horizontal steps that make up the staircase.
  • Risers: The vertical elements that connect the treads.
  • Newel Posts: The vertical posts that support the handrail.

Detailing a Double Stringer Staircase in DWG: The Architect's Guide to Double Stringer Staircase Details

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

  • Stringer layout: Draw the two side stringers, including their dimensions, material, and connection details.
  • Tread and riser layout: Draw the individual treads and risers, including their dimensions and material.
  • Newel post layout: Draw the newel posts, including their dimensions, material, and connection details.
  • Handrail layout: Draw the handrail, including its dimensions, material, and connection details.

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:

  • Use a consistent scale and dimensioning system.
  • Include all necessary annotations, such as material specifications and connection details.
  • Use layers and line types to differentiate between various components.

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:

  • A sample DWG file (autocad)?
  • More staircase design examples?
  • Staircase building codes and regulations?

The "story" of a double stringer staircase is one of transition from hidden support to architectural centerpiece. While traditional stairs often hide their structure behind walls, the double stringer design celebrates engineering by putting the "skeleton" on display. The Evolution of the Double Stringer

Historically, grand staircases used massive stone or timber to impress guests. However, the modern double stringer—characterized by two parallel beams supporting treads from the sides or underneath—emerged as a way to combine transparency with strength.

3. Connection Details (The most critical part)

  • Top Connection: Upper stringer termination. Does it bear on a ledger plate? Is there a knife plate welded to the stringer and bolted to the beam? The DWG must show bolt diameters (e.g., ¾" ASTM A325), edge distances, and weld symbols (e.g., ¼" fillet weld, 2" staggered).
  • Bottom Connection: Anchoring into concrete slab. Typical details include a steel shoe or a bent plate with epoxy anchors. The DWG should reference anchor model numbers (e.g., Hilti HUS3-H ½").
  • Intermediate Supports: If the span exceeds 13 feet, the DWG will show a center column or a wall stringer.

Feature: Double Stringer Staircase – Structural Detail

Type: Staircase Assembly – Steel or Reinforced Concrete
Usage: Interior/Exterior (specify as required)
Scale: 1:20 or 1:25 for detailing

3. Key Dimensions Table (to include in DWG)

| Parameter | Value | |-----------|-------| | Stair width (clear) | 1100 mm | | Tread depth (going) | 260 mm | | Riser height | 170 mm | | Stringer slope | 32–38° (use ratio: rise/run × 100) | | Stringer thickness | 10 mm (steel) | | Landing thickness | 150 mm | | Anchor bolt embedment | 100 mm min |

4. DWG Detailing – Layers & Lineweights (ISO 13567)

Use these standard layers for a professional CAD file:

| Layer name | Color | Lineweight | Content | |------------|-------|------------|---------| | A-STRU-BEAM | Cyan | 0.35 mm | Stringer outlines | | A-STRU-STEP | Magenta | 0.25 mm | Treads & risers | | A-STRU-REINF | Red | 0.18 mm | Rebar (concrete) | | A-ANNO-DIMS | Green | 0.18 mm | Dimensions | | A-ANNO-TEXT | White | Default | Labels, notes | | A-ANNO-HATC | 8 (Gray) | 0.13 mm | Hatching (concrete/steel) | | A-REF-GRID | 9 (Light gray) | 0.13 mm | Grid lines |

Step 6 – Add hatches & annotations

  • Steel stringers: ANSI31 hatch at 45°, scale 1–2.
  • Concrete stringers: AR-CONC or ANSI32.
  • Call out: 2 - 150x250x10mm C-channel stringers, 10mm thick chequer plate treads.