Roof Purlin Types

Secondary framing is an important component of many pre engineered metal buildings.

Roof purlin types.

The inspector asked about the type of wood being used as purlins. They both can be combined well to make sure that the space below the roof. Purlin plate principal purlin and common purlin. I did not know.

The table shows one 2 x 8 that will make a 15ft. As the bar is hollow caps are welded to the ends of the purlin to keep moisture from getting inside and corroding the metal. He gave me a copy of r802 5 1 3 rafter spans for common lumber species. In architecture structural engineering or building a purlin is any longitudinal horizontal structural member in a roof except a type of framing with what is called a crown plate.

In structural steel or aluminum construction purlins usually w shapes or channels transfer roof loads to the major structural elements supporting the roof. It is suitable to use for roof sheeting from fiber cement. Rectangular hollow section rhs is a type of purlin often used in roofs where the support structure will be visible when construction is complete. For example decks and covered patios often use this type of purlin.

In traditional timber framing there are three basic types of purlin. All about purlin span for metal roof. One of my questions was about snow loads.