We are installing a grid system in a super store and the general contractor is demanding that we hang all piping within 6" of a panel point of the web-type roof joist. There is a detail showing sprinkler pipe to be installed in this location and a structural drawing showing the location of the main. We naturally installed the main to meet these criteria. The branch lines are run perpendicular to the joists so hangers for the branch lines are spaced at 6'-0" apart which is at every joist. This means that there is a 23 lb load at each hanger. Table 9.1.1.6.1(b) requires a 2 × 2 × 1/8 angle iron and the joists have a 2 x 2 x 3/16 angle iron on top. Has anyone else come across this requirement in the contract drawings and had it applied to all sprinkler pipe? We can use trapeze hangers to meet this demand by the GC but it will also raise the question in those of you who look up when you are in super stores, "Was this system installed by a licensed contractor? Matthew Stone _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
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