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Floor Framing. Grimsby Secondary School. Floor Framing Design. Factors affecting Design of Floor System: Load (weight of material) Size of members Spacing of joists Beams or bearing walls Stress Design Criteria (How joists are sized for proper span) Deflection.

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Floor framing

Floor Framing

Grimsby Secondary School


Floor framing design
Floor Framing Design

Factors affecting Design of Floor System:

  • Load (weight of material)

  • Size of members

  • Spacing of joists

  • Beams or bearing walls

  • Stress Design Criteria (How joists are sized for proper span)

  • Deflection


Floor frame consists of

Floor frame consists of

* Girders (Beams)

* Posts or columns

* Sill plates

* Joists

* Bridging

* Subflooring



Girders
GIRDERS

  • Larger principle beam made of steel or wood supported by posts/columns or piers which support the floor joists

  • Can be recessed into foundation wall

    Joists will set on top of girder

  • Can sit on top of foundation wall

    Joist will hang off side with Joist Hangers






Types of girders beams
Types of Girders (Beams)

  • Solid lumber

  • Glue-laminated (GluLam)

  • Composite beams

    • Parallam (PSL)

    • Micro-Lam (LVL)

    • Steel I-Beams





Sills
Sills

  • Often called Sill plates or Mudsills

  • Provide bearing for floor joists

  • Sill is attached with anchor bolts.

  • Spacing of bolts is determined by OBC

  • Ontario Building Code




Floor joists
FLOOR JOISTS

  • Series of parallel support beams which support floor loads and

  • which are supported by Girders, or bearing walls.

  • Types

    • Solid Dimensional lumber (2x __)

    • Wood I-beams

    • Open Web Floor Truss

    • Steel Joists

    • Structural Insulated Panels (SIP)





Wood i beams
WOOD I-BEAMS

  • Structural, load-carrying I-joists used in

  • residential and light commercial construction.

  • Composition

    • The flange material for I-joists is typically

    • dimension lumber or laminated veneer

    • lumber (LVL)

    • The web is plywood or OSB.

    • The "I" configuration provides high

    • bending strength and stiffness

    • characteristics.









Bridging dimensional lumber
Bridging Dimensional Lumber

  • Joists have a tendency to sway and deflect over long

  • spans

  • Bridging stiffens flooring

  • Types:

    • Solid Horizontal bridging

    • Cross bridging

  • Span greater than 10' have at least 1 row

  • Span greater than 14-16' have 2 rows of bridging,

  • 5-8 feet apart





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