Roof Framing Plan Roofing C Purlins

In addition our c section purlins can also be used for door framing roof trimming window trimming parapet rails and side rails also see z purlins.

Roof framing plan roofing c purlins.

The steel purlins are in turn supported by rafters or walls. This frame supports and is hidden by a metal facia board. 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. 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.

Roofing terms when framing a roof figure 7 2 carpenters must be familiar with commonly used roofing terms figures 7 3 and 7 4. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. The tops of inclined rafters are fastened to. They vary in size depending on length and spacing.

Purlins traditionally support the roof deck cladding sheeting and are in turn supported by the principal rafters steel beams etc. Rafters rafters make up the main framework of all roofs. Purlins are non pressure treated 1 x 4 x 12 lumber that is installed on to the roof in a specific layout pattern and screw pattern. Our frame is welded up of 1 x 1 angle bar and 1 flat bar.

Welded together they can be used as columns braces and ties. The facia frame may also supports the soffit. C section purlins or cee section purlins are designed to form the walls and floor joists of a building shell structure making them also ideal for supporting beams needed for mezzanine flooring. Cee purlins are secondary steel framing members most commonly used as roof purlins wall girts and header jamb and sill for windows and doors on metal buildings.

A common arrangement is a rafter and purlin system which combines purlins and rafters. The purlins support the long span steel roofing but before the roof itself is put on a metal facia frame is installed around the perimeter of the roof. The shape of cee purlins does not allow end lapping they are butted together. Metal c purlins are light in weight and perfect for simple span construction.

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