Roofing Sheets Installation Guide
metal Z section purlins in Z39 structural grade galvanised steel. These are available with a 140mm, 175mm or 200mm depth Z section and in 1.6mm, 1.8mm and 2mm thicknesssteel. Z section purlins can be made to any length and can be joined by overlapping (one Z section can be turned around andslotted inside
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