floor framing student to copy

dearmeltedUrban and Civil

Nov 25, 2013 (4 years and 1 month ago)

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Floor Framing

Grimsby Secondary
School

TCJ3C

BALLOON FRAMING




An older style of framing in which the studs in
the bearing walls are run uninterrupted from the
sole plate up to the roof plate.


The floor joists are nailed to the studs.


Quality of longer materials not as available


1 x 4 let into the framing for diagonal bracing.


BALLOON FRAMING










PLATFORM FRAMING



Frame of the building is raised one story at a time
with studs that are a single story high.


The walls for each story are set over the
underlying joists and subfloor


Floors are complete and independent of the
walls


Subfloor extends to the outside edges of the
building.


Each level of the house is constructed
separately.


Build walls on floor and tilt up into place.


PLATFORM FRAMING

Floor Frame Members


Floor frame consists of:



Girders


Posts or columns


Sill plates


Joists


Bridging


Subflooring


GIRDERS (Beams)



Larger principle beam made of steel or wood
supported by posts/columns or piers which
support the floor joists


Can be recessed into foundation wall


Joists
will set on top of girder


Can sit on top of foundation wall Joist will hang
off side with
Joist Hangers


GIRDER COLUMNS



Girders may be supported by steel columns



Column size determined from blueprints

Types of Girders



Solid lumber


Glue
-
laminated (GluLam)


Composite beams

Parallam (PSL) Micro
-
Lam
(LVL) Steel I
-
Beams


Sills



Often called
Sill plates
or
Mudsills


Usually 2x6


Provide bearing for floor joists



Sill is attached with anchor bolts.



Size number, and spacing of bolts is determined
by OBC.


FLOOR JOISTS



Series of parallel support beams which support
floor loads and which are supported by Girders,
or bearing walls.


Solid Dimensional lumber (2x __)



Wood I
-
beams


Open Web Floor Truss


Steel Joists


Bridging


Joists have a tendency to sway and deflect over
long spans



Bridging stiffens flooring


Solid wood



2” X 2 “ diagonal cross bracing