Loading...
Left left-line Left right-line Left space

Framing Characteristics

In California, framing systems vary widely depending on the type of construction (residential, commercial, hillside, etc.), the building code requirements (especially seismic), and local materials. Below is a full overview of the main types of framing used in California, from simplest to most advanced — including where and why each is used.

1. Wood Stud Framing (Light Wood Framing)

Most common type in California residential construction

Used for:

  • Single-family homes
  • ADUs (Accessory Dwelling Units)
  • Small apartment buildings
  • Light commercial structures

Characteristics:

  • Uses dimensional lumber (2x4, 2x6) for walls, floors, and roofs
  • Fast, affordable, and easy to modify
  • Performs well under seismic loads if shear walls and hold-downs are properly designed

Subtypes:

  • Platform Framing (most common): Each floor is framed as a separate platform.
  • Balloon Framing (older structures): Continuous studs from foundation to roof; rarely used now due to fire-stopping requirements.

2. Heavy Timber / Post-and-Beam Framing

Used for:

  • Custom homes, lodges, and architectural builds
  • Commercial or public buildings with exposed wood structures

Characteristics:

  • Large wood members (6x6, 8x8, or bigger) replace standard studs
  • Can span long distances with fewer supports
  • Requires engineered connections
  • Aesthetically appealing, often left exposed

3. Steel Stud Framing (Light Gauge Steel)

Used for:

  • Multi-unit residential
  • Commercial interiors and exteriors
  • Mixed-use or podium projects

Characteristics:

  • Non-combustible (required in many urban areas)
  • Straight, lightweight, and resistant to rot or termites
  • Requires specialized cutting and fastening
  • Often combined with wood or concrete systems

4. Structural Steel Framing

Used for:

  • Mid- and high-rise buildings
  • Industrial facilities
  • Parking structures or large spans

Characteristics:

  • Steel beams, columns, and girders form the primary load-carrying structure
  • Allows wide open spaces and multiple stories
  • Requires welding or bolted connections
  • Must be fireproofed and seismically designed

5. Concrete and Rebar Structural Framing

Used for:

  • Large commercial buildings
  • Parking garages
  • Infrastructure (bridges, retaining walls, foundations)
  • Podium levels (e.g. concrete base with wood above)

Characteristics:

  • Strong in compression, reinforced with steel rebar
  • Provides excellent fire resistance and durability
  • Often used as the “podium” under light-framed upper floors (Type V over Type I)

6. Hillside / Caisson-Based Framing

Used for:

  • Homes and structures on sloped or unstable terrain (very common in Los Angeles and coastal regions)

Characteristics:

  • Structure supported by drilled concrete piles (caissons) and grade beams
  • Framing often elevated on steel or wood posts
  • Requires precise load transfer and lateral bracing
  • Designed for seismic and soil movement conditions

7. Hybrid Framing Systems

Used for:

  • Complex residential and commercial projects
  • Buildings that combine aesthetics with performance

Characteristics:

  • Mix of materials — e.g., steel beams with wood joists, or concrete podium with wood upper floors
  • Designed to handle specific architectural forms or load requirements
  • Common in modern architecture and hillside construction

8. Seismic-Resistant and Shear Wall Systems

Used for:

  • Required by California Building Code (CBC) for all structures

Characteristics:

  • Includes wood shear walls, steel braced frames, or moment-resisting frames
  • Ensures the building can withstand lateral (earthquake) forces
  • Integral part of framing — not a separate system

Summary Table

Framing Type Common Use Material Seismic Suitability Notes
Wood Stud (Platform) Homes, ADUs Wood Excellent with shear walls Most common in CA
Heavy Timber Custom builds Wood Good Aesthetic & structural
Light Gauge Steel Commercial/residential Steel Excellent Non-combustible
Structural Steel Mid/high-rise Steel Excellent High strength, flexible
Concrete & Rebar Commercial, podium Concrete Excellent Fire & seismic resistant
Hillside / Caisson Sloped lots Concrete + Steel/Wood Critical Complex engineering
Hybrid Custom or modern Mixed Excellent Combines multiple materials
Seismic Systems All Various Required Tied into CBC code
Right space Right left-line Right right-line