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Warnings Design & detailing should be carried out by a qualified structural engineer The construction of LYSAGHT BONDEK® steel decking is a simple, familiar and widely accepted practice. This page details some of the main installation instructions for BONDEK®. Laying The BONDEK® decking must be assembled with the side lap ribs interlocking. Interlocking can be achieved by two methods as described below. However, either method may be used in most situations. Variations to these methods may be acceptable. One method of achieving the interlocking is to progressively lay the BONDEK® sheets parallel with the previous sheet. The female lap rib is placed overlapping the male lap rib of the previous sheet and interlocking is achieved by applying foot pressure, or a light kick, to the female lap rib to clip onto, and interlock, with the male lap rib. Interlocking should be done progressively as each sheet is laid down. See Figure 1A. An alternative method requires the female lap rib to be placed down at an angle to overlap the male lap rib of the previous sheet. The angled sheet is then simply lowered down through an arc to rest adjacent to the previous sheet. See Figure 1B. The lap ribs should thus be properly interlocked. Where this does not occur due to some damage or distortion from site handling or construction practices then it is recommended that sufficient side lap fasteners be used to pull these laps tightly together. Fastening Side Lap Joints To maintain a stable platform under load, and to minimise concrete seepage during pouring, the side lap joints may require fastening. Fasteners shall be No.10-24 x 16mm self-drilling tapping screws and be located on the side lap midway between the embossments. See Figure 2. The frequency of fasteners will depend upon the situation as described below: The minimum fastener requirement is one fastener at mid-span for support spacing of 2750mm or greater. To obtain a point load rating of 2.3kN (235kg) the side lap joints will require fastening as follows: For 1.0 BMT BONDEK® a single fixing at mid-span is required for spacing between supports over 2000mm and up to a maximum of 3250mm. For 0.75 BMT BONDEK® a single fixing at mid span is required for spacing between supports over 2000mm and up to a maximum of 2400mm. For 0.6 BMT Domestic BONDEK® a single fixing at mid span is required for spacing between supports up to a maximum of 1825mm. For exposed BONDEK® soffits where good visual quality is required, it may be necessary to provide fasteners at closer spacings to ensure a uniform soffit between adjoining sheets, and to further reduce concrete seepage.

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