Roof Rafters And Ceiling Joists

Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall.

Roof rafters and ceiling joists.

You can possibly remove them altogether of you include posts in the gable walls to support a structural ridge. In unfinished space an attic insulation is typically laid between the joists. Rafters are the building components that run diagonally from the wall plate to the apex of a roof structure. This board forms the bottom member of each rafter and of course the ceiling of the space below.

The joists might then be covered with osb or plywood to form an attic floor for storage. Rafters form the foundation for attachment of the roof boards onto which the final roof covering is fixed. The are similar to trusses in this regard. If you are framing a cathedral ceiling there are a couple ways to deal with the need for rafter ties.

In this design the tops of the rafters attach to a load bearing ridge beam that runs along the length of the roof. In traditional timber they are nominally 2 inches thick and typically 8 to 10 inches wide. Use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. Corbett grace their parents and even their kids are learning a lot about the many ways a few right many wrong to build a high performance home.