Transcript Slide 1

Unit 29
Floor Framing Members
 Joists
 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
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
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
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
Difference between Girder and
Conventional Floor Framing
 Built Faster
 Members must be heavier
 Popular with houses that do not have a basement
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
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
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
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