The rafters carry the applied loads to the exterior walls.
Lp i joist roof rafters.
They can be trimmed on site and long lengths allow ceilings and floors to be designed with fewer pieces saving installation time.
Rafters act more like the top chord of a roof truss than as a roof joist.
Build sturdy stable floors with wider flanges.
The function of each component is.
The rafters carry the applied loads to the exterior walls.
The ridge board is non load bearing and merely provides the point of connection for the opposing rafters and is only a nominal 1 thick.
Joists and collar ties.
The function of each component is.
We offer longer lengths so that ceilings and floors can be designed with fewer pieces saving time on installation.
Not shown are the hip and valley rafters needed to tie the roof together where the rafters are framed at an angle to each other.
In a rafter roof all of these components are required to provide a stable roof.
In a typical roof framed with dimension lumber the rafters rest on the exterior wall top plate at the lower end and bear against a ridge board at the top.