CSI Seminar
Monday October 8, 2007
Light Gauge Framing

  1. Typical Floor spans are 13 feet. Spans under 20 feet are good. The system can span up to 30 feet, but joist spacing becomes closer, the gauge of steel increases and joist may need to be doubled. At thirty foot space it seems to me open web joist or other structural systems would be more economical.
  2. The standard floor system is corrugated deck with a concrete topping. Structural Cement board can be used as flooring. Joist space may be needed to be reduced. Sound transfer through the floor is greater than a deck and concrete topping.
  3. The concrete toping is poured after all walls are up, and electrical and mechanical is installed. This concrete is poured into the wall running tracks and around floor poke holes to provide a fire rated floor. Minimal fireproofing is required around floor poke holes.
  4. To increase the STC rating for floor/ceiling system, a suspended gypsum ceiling system is hung below the floor joist.
  5. Light Gauge Framing can be used for 1 to 12 story buildings. This is based on a maximum height that is can be built.
  6.  Light Gauge Framing is best for places where people sleep, because maximum spans are typical less than 20 feet.
  7. Plywood decking is provided on metal roof trusses for nailing roofing material.
  8. Wood trusses can be used with light gauge framing walls.
  9. A consulting structural engineer is needed for foundations and structural steel.
  10. . Steel is being used in southern states where cockroaches and mildew is a concern.
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