Roof Purlin Support
With rafters it runs in perpendicular from the walls to the ridge while with purlins it runs to the ridge in parallel.
Roof purlin support. How to support roof purlins. 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. A common arrangement is a rafter and purlin system which combines purlins and rafters. Using a combination of rafters and purlins is common.
Purlins are supported either by rafters or the walls of the building. The support system for the roof is comprised of ridgepole and rafters or purlins. Once your purlins have been fitted and a supporting framework has been created you should look to carry out an inspection before you continue work. 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.