R802.5.2

Section R802.5.2 is titled 'Ceiling joist and rafter connections' and covers requirements for roof-ceiling construction. The requirement for ceiling joists which run parallel to rafters, to be connected to rafters with a minimum amount of fasteners in accordance with a table in this code, where ceiling joists are above a certain percentage of the rafter height, for the ridge to be designed as a beam, where ceiling joists are not parallel to rafters, for the ceiling joists to be connected to top plates in accordance with a table in this code, and for rafters to be tied across the structure by certain methods is established. The purpose of this section is to prevent structural failure.

The model shows a section of a ceiling joist parallel to a rafter being nailed together.