I had to carefully design the width of the windows, as there are a number of components to consider, as mentioned here.
So when it comes time to install a window, I need to put a ‘frame’ of 90x45mm timber around the window so that the weatherboards and window trim abut the window at the correct depth.
(note: need drawing here)
As you can see in this photo, I have installed the 90×45.
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I chose to fix the 90×45 into the framing studwork behind the sheeting with 100mm screws, rather than nail it.
38x45mm cement sheet window trim will be fixed to this subframe, directly abutting the window frame, which will leave 45mm for the weatherboard fixing.