D09
When purchasing or assembling?

Purchasing would involve calculating the number of gaps per meter and then x number of linear meters.

For assembling, a spacer is recommended, such as a long board with the correct distance. Just make sure the first one is completely straight with a level, and then check continuously with the level and spacer. There are probably easier methods, but that's how I did it :)
 
It's not possible to get the same measurements... at least not if it needs to be good around the windows/doors...
 
It is mostly during assembly that I am thinking about. You want it to be fairly even with spacing, etc. Should the bottom board be the same size as the cover board (wide) or should you go a bit wider with the bottom board?
 
If you want the underboard to be approximately as visible as the lid, you can, for example, use a 145mm underboard and a 95mm lid. But that may not always be possible due to, among other things, windows. Then you may need a wider underboard.
 
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jonas_a
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Example with cover panel 120mm both cover and bottom board.

Determine where bottom boards should be placed at windows and corners, nail these up.

Measure from one bottom board and past the other.

e.g., 4230mm

The covers must overlap the bottom board by at least 20mm, so the maximum allowed gap on the bottom boards will be 120-40=80mm

gap + cover width = 200mm

divide the total measurement 4230 by 200. answer 21.15 boards

divide the total measurement 4230 by 22 boards. answer 192.3

subtract the cover width 120 from 192.3, and you get the gap on the bottom boards to 72.27mm
 
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