Transcript Ch. 11 - Sill and Floor - University High School

Chapter 11
Sill and Floor
Construction
Platform Framing
One
and two story construction
Easy
Fast
Shrinkage is uniform
Safe – solid surface for construction
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
Platform Framing
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
Balloon Framing
Solid
No
Sill
header
Need for fire
stops
Joists nailed to
wall studs
Balloon Framing
T-Sill
Has
header
No need for
fire stop
Balloon
Framing
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)
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
Floor Joist
Span Data
Page 196
Floor
Systems
Trusses P. 199
Girders
Beams
Partition Walls
(Parallel Walls)
Cross Bridging
P. 198
Sub floor
Plywood
Tongue and
Groove
Common Boards
OSB
Cantilevering
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
In line with the
ridge beam
Perpendicular to
the ridge beam