Roof Rafters And Ceiling Joists

This board forms the bottom member of each rafter and of course the ceiling of the space below.

Roof rafters and ceiling joists. This is called prescriptive solutions. The joists might then be covered with osb or plywood to form an attic floor for storage. Sometime we just need a longer piece of wood like a hip king rafter.

Assuming that your builders have chosen to use wood for your house s frame your roofing joists ceiling joists rafters or trusses will be made from long planks of wood placed parallel to one another at evenly spaced intervals along the length of your roof. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. A structural ridge is the standard alternative to ceiling joists.

In traditional timber they are nominally 2 inches thick and typically 8 to 10 inches wide. The fact is that there are many things carpenters do that are allowed because we all know they work. In order to maintain the triangle shape there are specific requirements for how to fasten the corners of the triangle together.

Rafters are the building components that run diagonally from the wall plate to the apex of a roof structure. Use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. In this design the tops of the rafters attach to a load bearing ridge beam that runs along the length of the roof.

This scheme is predicated on achieving serious load carrying connections well thought out and installed a 35 or l clips should to it at all joints. Rafters form the foundation for attachment of the roof boards onto which the final roof covering is fixed. Of course we re talking about splicing a joist or rafter as part of a repair technique for a rotted termite damaged or over spanned joist.

The are similar to trusses in this regard. Tie to roof rafters at peak tie to ceiling joists roof rafters to ceiling joists at the eaves.