Look at some of the EIFS products - same idea. There are a number of
flavors of perforated vinyl starter strips in various profiles. There
should be one that does what you need. If not, you'll have to bend
something up out of aluminum coil stock or some bendable vinyl.
Usually rainscreen walls are vented at the top and bottom. You would
typically have a prepainted steel flashing at the bottom of the lap
siding with a minimum 3/4" vent gap to allow air to circulate between
the lap siding and the rigid insulation. There is also an L shaped
piece of galvanized vent screen installed to prevent birds and bugs
getting into the vent cavity at top and bottom.There should be a
weather barrier membrane such as delta facade or air outshield
installed between the rigid insulation and the furring so that any
humidity can pass into the vented air stream to prevent mould buildup.
These are general conditions, would need to see how the wall
terminates to give a better answer.
All the best
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