2015 Irc Floor Joist Span Tables

The 2015 span tables for joists and rafters updates the 2012 edition and provides a simplified system for determining allowable joist and rafter spans for typical loads encountered in one and two family dwellings and is referenced in the 2015 international building code and 2015 international residential code.

2015 irc floor joist span tables.

The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. Span tables for joists and rafters 3 american wood council table 9 1 required compression perpendicular to grain design values f c in pounds per square inch for simple span joists and rafters with uniform load. The still ambiguous lateral load provisions for decks have not been completely put to rest and the notorious anchor detail remains. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.

Span ft 1 5 2 0 2 5 3 0 3 5 2 30 22 18 15 13 4 59 44 36 30 25 6 89 67 53 44 38 8 119 89 71 59 51 10 148 111. Table r502 3 1 1 shall be used to determine the maximum allowable span of floor joists that support sleeping areas and attics that are accessed by means of a fixed stairway in accordance with section r311 7 provided that the design live load does not exceed 30 pounds per square foot 1 44 kpa and the design dead load does not exceed 20 pounds per square foot 0 96 kpa. Table r802 5 1 4 rafter spans for common lumber species ground snow load 50 psf ceiling not attached to rafters l δ 180. The 2009 irc saw deck ledgers addressed the 2012 set up a section in the irc specific for decks and the 2015 brings joist and beam span tables as well as post sizing and foundation provisions.