Monopitch, Flat & Curved Roof Systems

Monopitch Roof Sytems 0-25⁰ If no support can be provided by connection between the uppermost purlin and the main steelwork at mid-span or third points (according to span), we recommend our standard diagonal tie wires are used, fixed at both ends with bracing brackets and a rigid-fix strut, between the top two purlins. If a purlin spans greater than 3.500m on a monopitch roof system then restraints are necessary. Additional diagonal bracing may be required depending upon the length of the roof slope.
	Positive-Fix Detail Where there is an adequate hot rolled member at theeaves, Hi-Span struts can be used utilising the flexibility of both FB and AC cleats, as shown. This alleviates the necessity for diagonal bracing.
Flat Roof System 0-5⁰ When a roof pitch is less than 5 degrees, rigid fix struts are used in place of sag bars as the more robust restraint is capable of resisting a small compressive force that mat occur with this system. As a further precaution we recommend an additional set of diagonal braces with a reversed orientation as shown in the diagram below.
	Curved Roofs The bracing system required for a curved roof depends upon the prulin arrangement. Where the purlins are equally spaced about the ridge the standard bracing for a duo-pitch roof can be used. If the purlins are spaced unevenly, then the roof should be treated as two seperate mono-pitch systems. Therefore each side of the roof has its own set of struts and diagonals