Floor Joist Span Tables 2018 IRC

Find out how far a 2 x 10 made from No. 2 pine or other material can span as a floor joist according to 2018 International Residential Code for living, bedroom, and storage areas. These six tables cover the most common situations for 16″ o.c. applications. Bedroom areas are sized for 30 lb live load plus 10 lb of dead load(20 lb for ceiling). Living areas are sized for 40 lb live load plus 10 lb of dead load(20 lb for ceiling). For all other applications click here to go the reference in the code book.

2 x 8 Floor Joist Spans

Southern Pine

Bedroom  

Living Area  

Number 114′  2″12′  10″
Number 213′  3″11′  10″
Number 310′8′  11″
SS14′  8″13′  4″

2 x 10 Floor Joist Spans

Southern Pine

Bedroom 

Living Area 

Number 118′16′  1″
Number 215′  8″14′
Number 311′  1″10′  10″
SS18′  9″17′

2 x 12 Floor Joist Spans

Southern Pine

Bedroom 

Living Area 

Number 121′  4″19′  1″
Number 218′  6″16′  6″
Number 314′  4″12′  10″
SS22′  10″20′  9″

2 x 8 Floor Joist Spans with Ceiling

Southern Pine

Bedroom 

Living Area 

Number 113′  9″12′  7″
Number 211′  10″10′  10″
Number 38′  11″8′  2″
SS14′  8″13′  4″

2 x 10 Floor Joist Spans with Ceiling

Southern Pine

Bedroom 

Living Area 

Number 116′  1″14′  8″
Number 214′12′  10″
Number 310′  10″9′  10″
SS18′  9″17′

2 x 12 Floor Joist Spans with Ceiling

Southern Pine

Bedroom 

Living Area 

Number 119′  1″17′  5″
Number 216′  6″15′  1″
Number 312′  10″11′  8″
SS22′  10″20′  9″