Depending on the roof design and the roof rafter spacing.
Roof and ceiling framing.
Building code 2018 of utah 23 wood 2308 conventional light frame construction 2308 7 roof and ceiling framing 2308 7 wood roof and ceiling framing the framing details required in this section apply to roofs having a slope of not less than three units vertical in 12 units horizontal 25 percent.
When framing your ceiling if the ceiling joists are not going in the same direction as the roof rafters 2 by 4s are added running in the same direction as the rafters.
Apart and attach the ends to the ends of the rafters.
With premanufactured trusses or with rafters and ceiling joists commonly called stick framing.
Building codes such as the icc s 2012 international building code section 2308 10 roof and ceiling framing typically specify that where rafter ties are used they are required at intervals ranging from 12 to 24 o c.
Framers stick building a hip roof you can learn a great deal about roof framing by understanding the concepts of framing a gable or shed roof.
While truss roofs are the most popular construction style today by some estimates truss roofs outnumber stick frame roofs two to one there are regions of the country where builders still prefer stick frame roofing.
There are two common ways of framing the roof of a house.
There are several roof types.
The governing concept in the roof ceiling framing provisions is that loads on the roof are going to attempt to push the walls out and some resistance to that push must be provided.
Ideally that resistance would be provided by connections between rafters and parallel ceiling joists.
Nail the 2 by 4s to the top of each ceiling joist with 2 16d nails.