Other specifications to consider when selecting rafters, beams, and joists are: moment, shear, and reaction capacity for normal load duration deflection, both in terms of bending and shear deformation ...
Where and how to drill floor joists for electrical cables or plumbing runs depends on what type of floor framing you have.
These wooden beams slope downward from the central ridge or hip of the roof down to the top of the wall, where a series of ridge boards (or ridge beams) and ceiling joists hold the rafters in place.