Roof Purlin Types

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

Roof purlin types.

In structural steel or aluminum construction purlins usually w shapes or channels transfer roof loads to the major structural elements supporting the roof. In traditional timber framing there are three basic types of purlin. Rectangular hollow section rhs is a type of purlin often used in roofs where the support structure will be visible when construction is complete. One of my questions was about snow loads.

They both can be combined well to make sure that the space below the roof. The type and spacing of purlins is a design consideration which depends upon the incident roof loads as well as the limiting lengths of sheeting to be used. All about purlin span for metal roof. For example decks and covered patios often use this type of purlin.

He gave me a copy of r802 5 1 3 rafter spans for common lumber species. I explained the layout of roof trusses and purlins on your building design. The table shows one 2 x 8 that will make a 15ft. Also referred to as secondary structurals this type of framing runs in between primary framing elements creating a structure within a structure much like cross beams in a wooden building.

Purlin plate principal purlin and common purlin. I did not know. The inspector asked about the type of wood being used as purlins.