Course 12: Multi-Story Vertical Circulation — Parametric Stairs, Handrails, Complex Roofs & Slabs

Course Technical Scope & Production Competencies

Vertical circulation cores and complex pitched roofs require strict adherence to building egress codes (riser/tread ratios) and 3D valley/hip intersection geometry. Course 12 guides architects through GstarCAD Architecture's 3D vertical building envelope generators.

• Design code-compliant dog-leg, U-shaped, spiral, and scissor stairs (STAIR) that automatically calculate riser count ($2R + G \approx 600\text{--}650\,\text{mm}$), break lines, up-arrows, and 3D handrails (RAILING).
• Construct multi-pitch hip, gable, and mansard roofs (ROOF) with adjustable eave overhangs, fascia/soffit profiles, dormer cutouts, and automatic wall-to-roof top clipping.
• Model structural floor slabs (SLAB), exterior curtain-wall mullion/transom systems, and automated room space boundaries with live net/gross floor area tags (AREATABLE).

Module 1: Parametric Multi-Flight Stairs, Hip/Gable Roofs, Floor Slabs & Curtain Wall Grids

When authoring a staircase in GstarCAD Architecture, the engineer specifies the floor-to-floor story height (e.g., $3,600\,\text{mm}$) and target riser height ($150\,\text{mm}$). The parametric engine automatically synthesizes 24 risers across two flights and an intermediate landing, rendering the standard 2D diagonal break-line and upward egress arrow in Plan View while generating a complete 3D stepped solid with balusters for section extraction and client walkthroughs.

For room area auditing and commercial lease calculations, GstarCAD's AREATABLE utility scans closed room boundaries or polylines, numbers each room sequentially, stamps the exact square meterage (`m²`) inside the plan, and compiles a live dynamic summary table on the drawing sheet.

Module 2: Step-by-Step Hands-On Command Execution Lab

Follow this structured 4-step laboratory procedure directly at the GstarCAD command line or dynamic input prompt:

1. Step 1 — Environment & System Variable Initialization: At the command prompt, verify the active state of core commands and variables: STAIR, RAILING, ROOF, SLAB, SKYLIGHT. Ensure that object snap bitcodes (OSMODE=175), associative dimensioning (DIMASSOC=2), and multi-core display regeneration (WHIPTHREAD=3) are active.
2. Step 2 — Primary Geometry & Metadata Authoring: Execute the primary workflow on standardized ISO 13567 or discipline-specific layers. Never place production geometry or block definitions on Defpoints, and keep internal block geometry on Layer 0 so instances inherit host layer properties dynamically.
3. Step 3 — Associative Verification & Revision Auditing: Test parametric associativity by stretching or modifying parent geometry and confirming that linked dimensions, attributes, schedules, or section views update automatically without disassociation warnings (ANNOMONITOR=2).
4. Step 4 — Pre-Transmittal Quality Assurance (QA/QC): Prior to saving or publishing the deliverable, run OVERKILL to eliminate duplicate vectors, -PURGE (RegApps and All) to strip orphaned symbol table bloat, and AUDIT to verify 100% AcDbObject handle integrity.

Module 3: Command & System Variable Reference Matrix

Module 4: Practical Lab Exercise & Certification Self-Check

Hands-On Capstone Task: Open a production DWG file in GstarCAD 2027, execute the complete STAIR, RAILING, ROOF, SLAB, SKYLIGHT sequence documented above, and save your standardized configuration as a reusable corporate template (.dwt). Once you have verified zero audit errors and clean Paper Space viewport scaling, test your mastery in the official GstarCAD Skill Certification & Assessment Engine.