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            There are many different types of bracing utilized for secondary support members of steel buildings. To start with, steel roofing may supply  some level of continuous internal bracing. But standing-seam steel roofing is able to supply only a limited amount of purlin bracing and, according to some professional engineers, almost none.
            Lateral flange restraint in steel structures is important but can be the only purlin-bracing benefit by using the process of through-fastened roofing. On its own, roofing cannot supply purlin torsional stability and the roof’s diaphragm rigidity and strength might be unable to prevent all purlins in array. And the roof from movement in a lateral direction. Steel roofing must then be augmented by other purlin bracing schemes to insure that all support objectives are satisfied.

         Other braces can aid in purlin support. The addition of a purlin brace at each concentrated load is provided in this scenario. One of the most effective bracing systems is to bolt closely spaced lines of channel sections in parallel between purlins. This is an exceptional method of blocking purlins from damaging rotation.
            An economical form of purlin bracing is provided by strapping or steel angles going from eave to eave perpendicular to the purlins. The bracing is attached at its ends to the eave struts and to each individual purlin. The braces can be placed in locations “in diagonal” or in a parallel configuration to the roof. This is accomplished by going from the top flange of a purlin to the bottom flange of the next and so on.
            There are other purlin bracing treatments available to help with structural integrity. One of the most common is the application of purlin bracing running in parallel to the pitch of the roof from eave to eave. Conversely, some steel building purchasers select strapping attached to the purlin flange with screws because of the economy of this method. However, purlin bracing needs to be held in a tight position in order to perform adequately and strapping has the propensity to sag. Strapping can only properly act when taunt. Additionally, correct purlin alignment is not augmented by the use of straps. Strapping that is in parallel lines cannot guarantee torsional stability nor can it hold back the roofing and entire array of purlins from lateral translation under load. Flat strapping is not a recommended means of purlin bracing.
            Angle bracing can be sized to fit any purlin spacing and used as effective support. The angles are attached to the purlins by a simple tab to slot process. Quickness of construction and the simplicity of the method are two of its major attributes. There are two obstacles with the use of this system, however. The braces should be able to be fitted in a straight line and connected together but cannot as they must be intermittent in placement to allow for bending. Also, if not all tabs are not bent to a ninety degree angle this may put into question the design anchorage ability of the brace and subsequent overall integrity of the steel building.