1. Floor Framing
Unit 29

2. Floor Framing Members Joists Posts Sills Girders Subflooring
Rest on top of girders
Posts
Pieces of wood or steel which support the girders
Sills
Anchored to the foundation wall for fastening and supporting the joists
Girders
Large beams which support the floor joists
Subflooring
Wood laid over floor joists

3. Sill plate fastening
½” bolts are used to attach the sill to the foundation walls
At least 2 bolts in each pair of sills
Attaching a Sill Plate to the Foundation Wall

4. Joist construction Usually placed 16” on center (OC)
Header joist (Also called a rim joist) should be aligned with the outside edge of the sill
Floor framing openings for chimneys and stairs should be doubled up.
For bay windows, floor joists should be extended beyond the foundation wall
Most common metal connector used in floor framing is the joist hanger

5. Bridging Placed at an angle between floor joists
Bridging stiffens the floor and distributes weight evenly on the joists
Bridging can be made of wood or metal

6. Difference between Girder and Conventional Floor Framing
Built Faster
Members must be heavier
Popular with houses that do not have a basement

7. Subflooring Laid directly over floor joists
Plywood or OSB (Oriented Strand Board) make excellent subflooring
Subflooring…. Not the actual framing……. Can be held together with adhesives along with fasteners

8. Floor Trusses Made in a factory to job specifications
Common depths of trusses are 14” and 16”
Can be made to reach from one side of the house to the other
Parallel chord truss has three basic parts
Top chord
Bottom chord
Webs

9. Wood I-Beams Also called I-Joists Not built to specific lengths
Should be stored on edge
Block called a web stiffner should be added to both sides of an I-Beam
Top and bottom Chords are connected by
Wood
Galvanized metal
Each is called a web

28. What’s wrong with this picture?