Even with perfect measurements it’s impossible to get to that line straight unless the frame is perfectly square. This not only completely solves that issue but also saves a ton of time not having to measure and cut them one by one.
Also the lumber I picked turned out to be 10 cm longer than the deck and I even picked the exact right amount. By the time I was done I only had a basket of <10 cm off-cuts.


I’ve been a professional before. Where it mattered we cut the ends off in place that same way.
Do you not need to treat the exposed ends several times then though? I gave up on a project like this because it just felt like it would rot again quickly.
What tool to cut them off without damaging surroundings? Just a circular saw?
Circular saw with the blade set such that it just barely will cut all the way through.
Track saw or a circular saw