Why are basements mouldy / Discussions

...are in the planning stages of designing a new home to be built to passive house standards, although not interested in certifying it.  We are trying to decide between having a basement vs.  a slab.  The house will be around 3000 ft2 and we do have room to do either option.  Soil conditions are not a factor, we are locat...

...are already dry and mold free? the exterior of the basement walls has 2”  of foam on them so any warmer air from finished basement would permiate through mineral wool to the wall but air space would or should allow for dry out no? Thoughts on that specific method?  Any research on it or seen it before fail or do fine? ...

...why the walls are wet and how renovations should be carried out. Having to remove all the poly is probably not the news you were hoping for but you are at least fortunate in the sense that there is no drywall on at this point. Most people only find out their basements are rotting many years after they've been finished....