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Sag-rod effectiveness?

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Dear all,

For the cold formed purlins, I have seen in some projects that they have used sag-rods which are prepared from slit coil waste-1.5mm thick and bent to get a circular shape of 15-16mm dia, the joint being open say 2-3mm . The ends of these sag –rods have the clips (as in umbrella) to lock these rods in purlins. How are these sag-rods compared to normal rods, angles etc?.  Are they really effective? Any views will be highly appreciated.

 

Best Regards,

 

Sunil Thengale