Chapter 11 Sill and Floor Construction Platform Framing

Chapter 11 Sill and Floor Construction

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

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

Platform Framing

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

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

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

Balloon Framing

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

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

Floor Joist Span Data Page 196

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

Sub floor t. Plywood t. Tongue and Groove t. Common Boards t. OSB

Cantilevering

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