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Floor System Sizes and Materials

Floor System Sizes and Materials. Lumber sizes. Common lengths 8’, 10’, 12’, 14’, 16’. Sill. Structurally graded according to knots (size, tightness, placement), wane, and straightness Must be pressure-treated lumber Used as a transition between masonry and standard lumber

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Floor System Sizes and Materials

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  1. Floor System Sizes and Materials

  2. Lumber sizes Common lengths 8’, 10’, 12’, 14’, 16’

  3. Sill • Structurally graded according to knots (size, tightness, placement), wane, and straightness • Must be pressure-treated lumber • Used as a transition between masonry and standard lumber • Anchor bolts embedded into masonry are commonly used to tie the sill to the foundation • Nails can be shot into concrete with a low-caliber nail gun

  4. Joists • Provide support for floor • Wood or steel

  5. Joists • Size of wood joists depends upon • Species of lumber • Wood grade • Spacing • 12”, 16”, or 24” O.C. spacing is most common • Works with the 48” module common to plywood and OSB

  6. Joists • Recommended live load (40psf) • Distance between supports (clear span) • Joists manufacturer’s charts

  7. Joists • Double joists must be provided under walls running parallel to the joist direction • May be solid or built up of two joists • May be solid or built up of two joists

  8. Joists • Bridging • May be used between joists • Transfers the floor loads to adjacent joists • Stiffens joists • Aligns joists vertically • May be diagonal wood members, metal or 1x3 wood cross bridging • May be solid blocking placed perpendicular between joists

  9. Wood Floor Trusses • May be used in place of solid lumber joists to provide support for the floor • Able to span longer distances than solid lumber joists • Reduce or eliminate the need for girders, piers, and columns • Allow for designing open spaces • Formed with top and bottom horizontal chords and diagonal webs constructed of standard size lumbers

  10. Wood Floor Trusses • Typically placed 24” O.C. • Open web construction • Reduces sound transmission through floors • Aids in ease of plumbing, electrical, and heating systems installation • Sizes are determined from manufacturers’ charts

  11. Wooden I-Joists • Similar to wood floor trusses • May be used in place of solid lumber joists to provide support for the floor • I-joists are able to span longer distances than solid lumber joists • Speed construction • Very straight • May come with circular knock-outs

  12. Wooden I-Joists • Formed with horizontal wooden (solid lumber or micro lam) top and bottom flanges, grooved to receive a solid plywood or OSB vertical web

  13. Joist Header • Used as rim joists with I-joist construction • Can be used with truss construction • Should be strapped to the sill in high wind areas • Double under exterior walls parallel to joist direction

  14. Girders (Beams) • Built-up • Formed with solid lumber nailed together • Built on the job • Glue laminated lumber (glulam) • Solid, 1x__ lumber, glued together under pressure • Graded according to appearance • Very strong • Able to span long distances

  15. Girders (Beams) • Glulam (cont’d) • Disadvantages • Weight • Expense

  16. Girders (Beams) • LVL (Laminated Veneer Lumber) • Glued veneers, similar to plywood • Advantages • High strength • Long spans • Disadvantages • Cost • Low moisture resistance causes delamination in high humidity

  17. Girders (Beams) • PSL (Parallel Strand Lumber) • Composed of veneers cut into strands • Very strong • Allows long spans

  18. Girders (Beams) • Girder size • Determined by • Type of material used • Loads imposed • Clear span of the girder • Where loads exceed material limits, the girder span must be reduced by using piers, piles, columns, or posts

  19. Subflooring • Provides a base for the underlayment and/or finish flooring material • Underlayment is material placed under finish floor coverings (i.e. as carpet, to provide a smooth, clean surface) • Underlayment can be combined with the subfloor into a single thickness • Single thickness underlayment/subfloor is generally constructed of ¾” tongue and groove plywood

  20. Subflooring • Materials • Tongue and Groove Plywood 4’x 8’ sheets speed the installation, glued and screwed.

  21. Crawl Space Considerations • Access door is required • Recommended size 24” wide x 18” high • Large enough to allow for repair and/or replacement of under-house mechanical systems • Ventilation provided • Removes moisture from crawl space • 8”x 16” vents are common

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