Hi, I might be asking a dumb question, but which of the different markings has the best strength?
K12, K18, K24, K30? Is the strength better with a lower number or a higher one?
Which is most suitable as joists or whatever it's called, the layer that lies on the posts for the carport I'm going to build, which you then place the trusses on, and what dimension? 45x120mm, 45x145mm, 45x170mm, 45x195mm, or 45x220mm.
I have a shed now with a gable roof that I will extend the roof on; the carport section will be 5400x3750mm.

Daniel
 
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