What are SAG roof rods?
What kind of load can a SAG rod carry?
Is 800 suggests that the purlins are designed as?
Export Data and Price of sag rods under HS Code 94060091 | Zauba.
Mainly sag rods are provided to give the lateral stability to the purlin and also to break the slenderness length of the purlin member. By providing the sag rod you can optimise the purlin sizes.
In steel construction, the term purlin typically refers to roof framing members that span parallel to the building eave, and support the roof decking or sheeting. Purlins are most commonly used in Metal Building Systems, where Z-shapes are utilized in a manner that allows flexural continuity between spans.
Sag bars are used to restrain the bottom flange of a purlin in order to reduce its effective length when exposed to uplift conditions. Where download is critical, with a relatively small uplift the sag bars contribute very little to the structural integrity of the roof.
In many installations, sag rods are used to provide alignment for these members for the attachment of the steel panels and to reduce their tendency to bend laterally and twist.
(in a roof) a rod for preventing the sagging of an open-web steel joist that is used as a purlin with its depth at right angles to a roof slope.
Sag rods are used to hold the purlins and the girts in a straight line. First, install the sag rods that connect the two purlins at the ridge of the building. Each rod must be attached from the’ top hole of one purlin through the bottom hole of the adjacent purlin.