2015 Irc Floor Joist Span Tables

A tutorial for using the span tables is also available.

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. International residential code 2015 irc 2015. 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 r802 5 1 4 rafter spans for common lumber species ground snow load 50 psf ceiling not attached to rafters l δ 180. The still ambiguous lateral load provisions for decks have not been completely put to rest and the notorious anchor detail remains. 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. Spans for ceiling joists shall be in accordance with tables r802 4 1 and r802 4 2.