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Comprehensive Guide to Platform and Balloon Framing in Construction

Learn about the differences between platform framing and balloon framing, the importance of sill plates, joist sizing and spacing, floor systems, subfloor options, and cantilevering techniques. Discover the best practices for a safe and solid construction process.

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Comprehensive Guide to Platform and Balloon Framing in Construction

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  1. Chapter 11 Sill and Floor Construction

  2. Platform Framing • One and two story construction • Easy • Fast • Shrinkage is uniform • Safe – solid surface for construction

  3. Platform Framing • Sill Plate – rests on the foundation, the beginning of the wood structure. (2 x 6) • Sill Sealer • Box sill construction • Header • Floor Joists

  4. Platform Framing

  5. Balloon Framing • Older method • Wall studs rest directly on sill plate. • Solid / Standard sill • T-Sill • Good Vertical stability • Need for fire stops • Poor work surface during construction

  6. Balloon Framing • Solid Sill • No header • Need for fire stops • Joists nailed to wall studs

  7. Balloon Framing • T-Sill • Has header • No need for fire stop

  8. Balloon Framing

  9. Joists and Beams • Joists – Provide support for the floor • 2 x 6 to 2 x 12 • 12” , 16” or 24” spacing • Softwood • Size depends on • Length of span • Load to be supported • Species and grade of wood • Spacing (O.C)

  10. Wood sizing • Nominal vs. Actual • 2 x 4 is actually 1½” x 3½” • 1 x 6 is actually ¾“ x 5½” • Chart on page 195

  11. Floor Joist Span Data Page 196

  12. Floor Systems • Trusses P. 199 • Girders • Beams • Partition Walls (Parallel Walls) • Cross Bridging P. 198

  13. Sub floor • Plywood • Tongue and Groove • Common Boards • OSB

  14. Cantilevering

  15. Post and Beam • Posts support Beams • Load bearing is spread over a greater span • Non load bearing walls • Curtain Walls • Foundations are continuous wall or piers • Beams are Longitudinal vs. Traverse Perpendicular to the ridge beam In line with the ridge beam

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