Making a longitudinal and circumference seam to metal jacket, which shall be applied to ensure a tight fit over the insulation and to prevent any lifting of the lapping edge at the longitudinal seam. All longitudinal seams shall be staggered on alternative side of the pipe and laps shall be located to give maximum protection from wind and rain.
metal jacket sheets shall be overlapped male to female in order to increase the regidity.
The metal shall be cut sufficient length to provide a minimum 50mm lap at the longitudinal seam.
The jacket shall be applied with a minimum circumferential lap of 50mm.