Steel Roof Purlins Design

Rhino metal building purlins and options traditionally rhino steel buildings use 8 to 10 primed red iron c purlins and z purlins.

Steel roof purlins design.

They expand and contract reasonably in extreme temperature changes. Civil engineering design in architecture or structural engineering or building a purlin or purline is a horizontal structural member in a roof. They give added support to the roof and also provide a nailing surface for the end panels and drip edge. The typical roof structure now consists of steel i beam rafters placed approximately 10 feet this varies depending on purlin size and other variables apart with either 4 6 or 8 lightweight steel purlins installed horizontally across the rafters.

They are light weight dimensionally stable accurate and straight. Metal roof purlins are installed horizontally under metal roofs. Steel purlin is a direct replacement for wood purlin. Purlins support the loads from the roof deck or sheathing and are supported by the principal rafters and or the building walls steel beams etc.

In timber construction purlins are nailed to the rafter or supporting trusses while in steel roof construction they are welded or bolted to the rafters or trusses by the means of cleats. If your design or local building codes demand extreme spans or snow loads taller purlins may be required. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. 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.

The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. Available in cee or zee shape red oxide primed or galvanized 16 14 or 12 gauge sizes from 4 up to 12 flange widths of 1 1 2 up to 4 cut to your specified lengths hole punching available load tables available for all material. Steel purlin is usually made of cold formed steel that is thin enough to put screws through. Engineered purlin metal mart offers a complete line of engineered purlin material.

Taller purlins also allow room for increased insulation. Welded together they can be used as columns braces and ties. Do all roofing projects require purlins. Purlins are 2 by 4 feet and are installed much like metal roofing.

Purpose use 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. Roof purlin are members used to directly support roof sheeting materials and could be made of timber or steel.