Wall Cladding End Laps
As with roofing, wall cladding sheets should, wherever possible, be laid in a single continuous length. Where this is not feasible due to excessive length or other constraints, there are options for lapping.
When the internal environment is dry and the wall is unlined, sheets can be simply end-lapped by approximately 150 mm. In dwellings, lined buildings, and buildings with moist internal environments, the laps should be sealed at both ends as per roof laps. The downside of end lapping is that there are four layers of material at the side lap/end lap junction. This often leads to an untidy looking join.
The preferred option where aesthetics must be considered is not to end-lap the sheets, but to have a zed flashing under the upper sheet and over the lower, with cover as shown in Barge Flashing Cover — Trapezoidal and Secret Fixed Table and Transverse Apron Flashing Cover Table. This is both tidier and allows the sheets to thermally expand individually.
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