The roof support system is a ridgepole and either rafters which run perpendicular from the top of the walls to the ridge or purlins which run parallel to the ridge.
Roof purlin support.
The support system for the roof is comprised of ridgepole and rafters or purlins.
How to support roof purlins.
In architecture structural engineering or building a purlin or historically purline purloyne purling perling is a horizontal beam or bar used for structural support in buildings most commonly in a roof.
Purlins are supported either by rafters or the walls of the building.
With rafters it runs in perpendicular from the walls to the ridge while with purlins it runs to the ridge in parallel.
In architecture or structural engineering or building a purlin or purline is a horizontal structural member in a roof.
A common arrangement is a rafter and purlin system which combines purlins and rafters.
Using a combination of rafters and purlins is common.