Floor Framing Unit 29

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

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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