This is a direct replacement of the wood purlin. Unlike wood purlin, steel roof purlins are lightweight, dimensionally stable, have more accuracy, and are straight. In extreme temperature changes, that is, cold or hot temperatures, the purlins expand and contract reasonably.
Purlin and girt are components that make up the secondary framing. Secondary framing is a fundamental component of a number of pre-engineered metal buildings.
C purlins are formed in the shape of the alphabet C, whose primary use is to support floors and walls. C-section purlins also referred to as cee section purlins, are made to shape the shell structure of the walls and the floor joists, which makes them suitable to support flooring beams.
Z purlin, which are stronger than the C purlin and are used at overlaps and joints in most cases. Zed purlins are beams horizontally built to shape a metal structure’s wall joists and roof. The zed-shaped purlins sit between the building and the roofing sheets.
These are C-shaped purlins but with special ribs, which are referred to as “SIGMA” purlins. The SIGMA purlins have good structural properties. These purlins are manufactured and installed to shape the shell structure of the building and its walls and floor joists. This nature of the purlins makes them ideal also for supporting beams that are essential in flooring
Purlins are installed horizontally. They are to be installed strategically on top of the roof rafters. The first step in installing your metal roof purlin is determining the number of purlins used. This is achieved by taking measurements of the roof.
Step two, snap a chalk line across the roof horizontally and two feet from the top. Lay the first purlin at the roof ridge beginning at either corner. Fated the purlin with nails into the vertical rafters.
Step three, Place the second purlin right to the next one, also horizontally, and install it with the same 16d nails into the rafters. Continue this until you finish the first row, then cut to size the last purlin if necessary.
Step three, Place the second purlin right to the next one, also horizontally, and install it with the same 16d nails into the rafters.