Hi I'm keen to insulate a loft with unusual construction (see below). I'm hoping that can be the usual "roll out some mineral wool" but am weary of condensation risks (all the more so as this is a timber frame, timber clad house).  ROOF: There's about 180m2 cold pitched roofs, seemingly built over an older, pre-existing flat roof.   Construction appears to be uninsulated joists, topped with a flat roof made of a slab perhaps 75mm thick of compressed straw, covered wit