Hello, I am going to install new trossbotten boards in our old house with a torpargrund. The problem is that we have CC 45-50 between the beams. The alternative is to buy trossbotten boards in 6mm oil-hardened masonite, but it feels unnecessary to have to split each board for them to fit. There are also 3mm oil-hardened masonite boards 1.2x2.4m that would be convenient to split, but is 3mm enough for them not to sag? Are there any other good alternatives?
Maybe add two layers of 3mm?
True. Didn't think money was an issue 
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