Floor Framing Grimsby Secondary School. Floor Framing Design Factors affecting Design of Floor...
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Transcript of Floor Framing Grimsby Secondary School. Floor Framing Design Factors affecting Design of Floor...
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
Floor frame consists of
* Girders (Beams)
* Posts or columns
* Sill plates
* Joists
* Bridging
* Subflooring
Floor Framing
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
RECESSED GIRDER
JOISTS HANGING FROM GIRDER
GIRDER COLUMN
Types of Girders (Beams)
•Solid lumber•Glue-laminated (GluLam)•Composite beams
•Parallam (PSL) •Micro-Lam (LVL) •Steel I-Beams
LVL - Laminate Veneer Lumber
PSL - Parallel Strand Lumber
Steel I-Beam Girder
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 IS FLUSH WITH GIRDER
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
CANTILEVERED JOISTS
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
STEEL FLOOR JOISTS
Open Web Joists
FLOOR JOIST LAYOUT
FLOOR JOIST LAYOUT
FLOOR JOIST LAYOUT
RIM JOIST
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
SUBFLOORING
• Thanks for watching