Double Stringer Staircase Detail Dwg 95%

A double stringer staircase is a structural design characterized by two parallel longitudinal beams (stringers) that support the stair treads. Unlike a mono-stringer, which uses a single central support, a double stringer system distributes the load to the edges or set-in points of the treads, offering superior structural stability and a classic, robust aesthetic. 1. Structural Anatomy and Materials

The primary components of a double stringer staircase include:

Stringers: These can be made from steel (using C-channels, UPN profiles, or rectangular tubes) or wood (typically 2x12 lumber). double stringer staircase detail dwg

Treads: The horizontal walking surfaces, which can be "concealed" within the stringer depth or "raised" on top of them.

Connections: Critical DWG details must show the baseplate floor connection, top floor supporting beam connection, and any intermediate landing supports. 2. Standard Design Dimensions A double stringer staircase is a structural design

To comply with international building codes (like ISO 21542 or ADA), specific measurements are required in any technical DWG:

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 | Step 3: Add the Rise/Run Template

Step 3: Add the Rise/Run Template

  • Total rise = 108". If riser = 7.2", then number of risers = 15.
  • Total run = (number of treads = 14) × 11" = 154".
  • Draw a polyline representing the notches: extend 11" horizontally, then 7.2" vertically, repeat 14 times.

10. Final Tip – Parametric Stair Tools

In AutoCAD, use Dynamo or AutoLISP routines to generate double stringer stairs parametrically. For Revit users: model a stair by component, then export to DWG – it automatically generates stringer families.

Part 7: Future-Proofing Your DWG – BIM and IFC Compatibility

While DWG is the industry standard for 2D shop drawings, the AEC industry is moving toward BIM (Building Information Modeling). When you create your double stringer detail:

  • Use Intelligent Blocks: In AutoCAD, convert your stringer detail into a dynamic block with visibility states (e.g., "steel" vs "wood" vs "concrete stringer").
  • Export as IFC 4x3: Ensure your DWG can be exported to IFC (Industry Foundation Classes) for clash detection with MEP (mechanical, electrical, plumbing) systems. A common clash is a sprinkler pipe running directly through the stringer web—your detail DWG should show a 4" clear zone.
  • Embed Parameters: In Revit (which imports DWG details), parameterize the stringer size so changing the live load automatically updates the steel channel designation.

4. Tread-to-Stringer Interface

  • For wood: Use 3D DWG blocks showing hidden structural screws or lag bolts.
  • For steel: Show weld tabs or countersunk bolts so the tread sits flush.