Floor Joist Placement

Floor joists are typically 2 by 8s 2 by 10s or 2 by 12s.

Floor joist placement.

The amount of flex that is acceptable in the floor you can play with a joist span calculator here. In general practice 2x8s 2x10s or 2x12s are used when framing a raised floor instead. Rock shims or hand packed and pounded smaller stones will stiffen the post placement and allow for proper drainage. Don t worry you won t need to do a lot of calculations in determining the size and placement of the structural framing within your house design.

All these conditions are important when determining floor joist placement on sill plates and beams. The exact size necessary may be stipulated by the building code required for a particular structure. 1 plan your floor framing layout. Ceiling joists are usually 2 by 6s or sometimes 2 by 4s if it is an older home.

A floor s framework is made up mostly of wooden joists that run parallel to one another at regular intervals. In the past 2x4s or 2x6s were sometimes used as floor joists. Study the blueprint and make note of the location of any stairway openings floor joist cantilevers in construction floor beams and heavy loads from above. This size is no longer acceptable when framing a structure.

When possible position floor joists with any crook in the board facing up so the weight on the joist will tend to straighten it out. Residential structural design vertical structural forces we were about to start learning about floor joist span tables. Good luck and keep us up to speed with your progress j. Some newer homes have manufactured i beam shaped joists.