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Floor Framing

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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  1. Floor Framing Grimsby Secondary School

  2. 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

  3. Floor frame consists of * Girders (Beams) * Posts or columns * Sill plates * Joists * Bridging * Subflooring

  4. Floor Framing

  5. 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

  6. JOISTS SITTING ON GIRDER

  7. RECESSED GIRDER

  8. JOISTS HANGING FROM GIRDER

  9. GIRDER COLUMN

  10. Types of Girders (Beams) • Solid lumber • Glue-laminated (GluLam) • Composite beams • Parallam (PSL) • Micro-Lam (LVL) • Steel I-Beams

  11. LVL - Laminate Veneer Lumber

  12. PSL - Parallel Strand Lumber

  13. Steel I-Beam Girder

  14. 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

  15. SILL PLACEMENT

  16. SILL IS FLUSH WITH GIRDER

  17. 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)

  18. DIMENSIONAL LUMBER

  19. DIMENSIONAL LUMBER

  20. CANTILEVERED JOISTS

  21. 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.

  22. WOOD I-JOISTS

  23. STEEL FLOOR JOISTS

  24. Open Web Joists

  25. FLOOR JOIST LAYOUT

  26. FLOOR JOIST LAYOUT

  27. FLOOR JOIST LAYOUT

  28. RIM JOIST

  29. 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

  30. CROSS BRIDGING

  31. SUBFLOORING

  32. Thanks for watching

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