Floor and Roof Joists

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Samir Awad

8:53 AM (7 hours ago)

to Catariname

Catarina and Marcin,

See below information on what we can use for floor and roof joists.  I added some table for additional information.  Let me know what you think

 

 

Per the 2018 IRC, assuming we are using Douglas Fur-Larch #2

  • For Floor Joists (measured span from the drawings = 15’-1”)
    • 2x12 @ 24”, for sleeping areas with maximum allowable span 16’-6”

 

  • For Roof Joists (measured span from the drawings = 15’-1”)
    • 2x10 @ 24” o.c. with maximum allowable span 18’-5”
    • 2x12 @ 24” o.c. with maximum allowable span 21’-4”

 

 

 

  • For Carport roof (measured span from the drawings = 16’-0”)
    • 2x12 @ 12” For Douglas Fur
    • 2x12 @ 16” for Southern Pine