Floor

Lumber Floor Framing Systems

Lumber floor systems are composed of joists, girders, and sheathing.
Floor joists.

Joists

Girders

Girders

Girders
Sheathing.

Sheathing

I-Joist Floor Framing Systems

I-Joist floor systems are composed of I-joists, sheathing, a rim board, and sometimes girders.
I-Joists

I-Joists

Sheathing.

Sheathing

Girders

Girders

Rimboards

Rimboards

Truss Floor Systems

Truss floor systems are composed of parallel chord trusses, sheathing, rimboard, and sometimes girders.
Trusses

Trusses

Girders.

Girders

Sheathing.

Sheathing

Rimboard 3d render.

Rimboards