Floor framing
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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

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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


Floor framing1

Floor Framing


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


Joists sitting on girder

JOISTS SITTING ON GIRDER


Recessed girder

RECESSED GIRDER


Joists hanging from girder

JOISTS HANGING FROM GIRDER


Girder column

GIRDER COLUMN


Types of girders beams

Types of Girders (Beams)

  • Solid lumber

  • Glue-laminated (GluLam)

  • Composite beams

    • Parallam (PSL)

    • Micro-Lam (LVL)

    • Steel I-Beams


Lvl laminate veneer lumber

LVL - Laminate Veneer Lumber


Psl parallel strand lumber

PSL - Parallel Strand Lumber


Steel i beam girder

Steel I-Beam Girder


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


Sill placement

SILL PLACEMENT


Sill is flush with girder

SILL IS FLUSH WITH GIRDER


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)


Dimensional lumber

DIMENSIONAL LUMBER


Dimensional lumber1

DIMENSIONAL LUMBER


Cantilevered joists

CANTILEVERED JOISTS


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.


Wood i joists

WOOD I-JOISTS


Steel floor joists

STEEL FLOOR JOISTS


Open web joists

Open Web Joists


Floor joist layout

FLOOR JOIST LAYOUT


Floor joist layout1

FLOOR JOIST LAYOUT


Floor joist layout2

FLOOR JOIST LAYOUT


Rim joist

RIM JOIST


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


Cross bridging

CROSS BRIDGING


Subflooring

SUBFLOORING


Floor framing

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