The NZ Metal Roof and Wall Cladding Code of Practice is a comprehensive design & installation guide, and a recognised related document for Acceptable Solution E2/AS1 of the NZ Building Code.
The flashing detailing for vertical cladding is similar to roof cladding penetrations, as the water from the 'under' has to drain over at the window or door head. The most satisfactory detail is to provide a sheet lap at the head flashing, which enables automatic weathering by profiling the vertical upstand of the head flashing or by flattening the lap. This detail can be used for corrugated, ribbed and trapezoidal cladding. Do not stop-end the flashing, but turn it down as shown in 7.6A Vertical Cladding Flashing.)
Similar flashing details to those described in section 6.4 (Window Flashings for Metal Cladding) can be used for windows and doors in vertical cladding, using either flush or reveal styles.
Include a small gutter to the head flashing when flush doorways without a protecting canopy are below a large catchment area. Small gutters should also be used for other penetrations, such as meter boxes.
Where the cladding uses a crimp curve design without eaves gutters, a gutter is essential over doorways.
Flashing circular windows into metal cladding without relying on sealants can be done by looking at the window as two halves meeting at the mid-height centre line. Provide separate flashings for the top and bottom.
External and internal vertical corners should have the same cover as described in 7.3A Minimum dimension 'C' flashing cover.