Use another off cut of weatherboard to mark out how much to cut on external corner of the wall. Drill the nail holes once the weatherboard is level and nail with aluminium rose head nail at bottom of the board to all batten, nailing pattern should be minimum 40mm from edge of the board and space no more than 600mm and vertically in line.

External corner will have tolerance for an open joint as it will be cove by corner soaker later. Internal corner will need to be notched with no gap shown.

Weatherboard will need to be fitted 10mm into the bottom and side of window & door joinery, head flashing may need to be scribed and cover by weather board above with 5m gap allowing water to flow out