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Lysaght Hook - Lok II Bridging Purlin bridging HOOK-LOK II bridging into Zed or Cee purlins may be installed in numerous ways. The normal procedure is to commence from the eave or ridge. A typical installation procedure is: Step 1: Install the fascia bridging assembly by inserting the locator end into the holes of the first purlin, and bolting the fascia bracket to the fascia purlin. Step 2: Install the standard bridging assemblies working towards, and finishing at, the ridge purlin. Standard assemblies are installed by fitting the clamp end over the previouslyinstalled locator end and swinging the bridging around until the locator end engages in the holes of the next purlin. Step 3: Where applicable, repeat Steps 1 and 2 for the opposite side of the roof. If appearance is a consideration, the bridging runs on both sides of the roof should be swung into position from the same end of the roof. Step 4: Install the ridge bridging assembly by fitting the clamp ends over the previously installed locator ends and then tightening the bolts of the ridge assembly When a ridge bridging assembly is not used, the locator(s) of the standard bridging is secured into position with two bolts. Step 5: Where turnbuckles are used in a bridging assembly, first align the purlins. Align the fascia purlin using the, adjustment bolts of the fascia bridging assembly. Girt bridging The recommended procedure is to commence at floor level and work towards the eaves. A typical installation procedure is: Step 1: Install the girt foot assembly by engaging the locator into the holes of the bottom girt. Due to the loads transferred to the bridging from the girts, the girt foot assembly must be anchored to the slab. Step 2: Adjust the girt foot assembly to level off the bottom girt. Where the slab is not yet poured, a temporary support is required to keep the bottom girt level. Step 3: Install standard bridging assemblies as described in Step 2 for purlin bridging, working towards the eaves. Step 4: At the top girt, the locator is secured into position with two bolts. If appearance is a consideration ensure the girt and purlin bridging are installed facing the same direction. Where a girt hanger is used it is installed by fitting the clamp end over the last installed locator end and swinging the bridging around, then bolting the turnbuckle to the fascia bridging. In projects where no girt foot assembly is used, particular care in design and construction is required. We recommended the following precautions during construction: The roof sheeting should be installed before the turnbuckle of the girt hanger is used to level the girts, which would impose loads on the fascia system; and Provide a temporary girt support under the bottom girt until the installation of the wall cladding is complete for that section.