Are Rafters Load Bearing?

It's long and skinny comparable to some ranch homes. The roof trusses/rafters and floor joists/trusses are running parallel to each other. This means that only the two walls the roof trusses/rafters and floor joists/trusses are bearing on are load bearing.

Are ceiling joists load bearing?

It's in the joists:

A joist is a horizontal structural member, running across an open space, that is used to transfer loads to vertical members, typically, floors & ceilings. ... Most times, if the joists run parallel to the wall, the wall is non-load bearing.

Is a roof a load bearing structure?

A load-bearing wall is any wall that holds up the weight of the structure above and the people/furniture supported by that structure. The floors above, roof structure, people and furniture are the “loads” that the wall has to support. A load-bearing wall transfers load all the way down to the building's foundation.