Floor FramingGrimsby Secondary SchoolTCJ3C

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