Chapter 11

Sill and Floor Construction

Platform FramingPlatform Framing

One and two story constructionEasyFastShrinkage is uniformSafe – solid surface for construction

Platform FramingPlatform Framing

Sill Plate – rests on the foundation, the beginning of the wood structure. (2 x 6)

Sill SealerBox sill constructionHeaderFloor Joists

Platform FramingPlatform Framing

Balloon FramingBalloon Framing

Older methodWall studs rest directly on sill plate.Solid / Standard sillT-SillGood Vertical stabilityNeed for fire stopsPoor work surface during construction

Balloon FramingBalloon FramingSolid Sill

No headerNeed for fire stops

Joists nailed to wall studs

Balloon FramingBalloon Framing

T-SillHas headerNo need for fire stop

Balloon FramingBalloon Framing

Joists and BeamsJoists and BeamsJoists – Provide support for the floor2 x 6 to 2 x 1212” , 16” or 24” spacingSoftwoodSize depends on

Length of spanLoad to be supportedSpecies and grade of woodSpacing (O.C)

Wood sizingWood sizing

Nominal vs. Actual2 x 4 is actually

1½” x 3½”1 x 6 is actually

¾“ x 5½” Chart on page 195

Floor Joist Span DataFloor Joist Span Data

Page 196

Floor Systems

Floor Systems

Trusses P. 199GirdersBeamsPartition Walls

(Parallel Walls)Cross Bridging

P. 198

Sub floorSub floor

PlywoodTongue and

GrooveCommon BoardsOSB

CantileveringCantilevering

Post and BeamPost and BeamPosts support BeamsLoad bearing is spread over a greater spanNon load bearing wallsCurtain WallsFoundations are continuous wall or piersBeams are Longitudinal vs. Traverse

In line with the ridge beam

Perpendicular to the ridge beam