Attic OSB boards measuring device

Hello community.

We built a house in 2015 and also immediately covered the attic floor with OSB boards after a "reasonable" amount of time (including cross battens). Now, in hindsight, one reads that OSB was not the best choice and can lead to mold formation, but I don’t feel like tearing everything out again. It is an unheated attic. One could now cut open some spots to check if mold has formed, or... that is the question: use a moisture meter? I have an electronic one with a metal ball at the front that measures moisture content. I have also measured at several spots upstairs before and all the values were good... so dry. Would a measurement with this also be possible so that moist areas can be detected without causing damage, and from this one could immediately infer an increased risk of mold? OR is it not advisable and one SHOULD unscrew the boards and check after all??

Thanks for your opinion

I had the impression that OSB is vapor-tight and therefore measuring from above is nonsense (but I'm not 100% sure). I would just unscrew a few... it's not that big of a deal.

I would just unscrew a few... it's not such a big deal.

Well, unscrewing is unfortunately difficult since OSB boards are installed with tongue and groove.

You can tell that I am a professional
Still, I think you should gain certainty and that can only be done by removing and examining the underside of a plate (at least in my opinion)

Thank you for your opinion

Depending on the use of the attic, a few holes for ventilation do no harm.

I simply did not let my OSB boards go all the way to the wall, so that there is a continuous edge of 5 cm for ventilation. Of course, the boards also rest on a counter batten.