Roof insulation, areas of application according to DIN 4108-10, Table 1

DAD      roof externally insulated, weather-protected, under cover

DAA      roof externally insulated, weather-protected, under waterproofing

DUK       roof externally insulated, weather-exposed (inverted roof)

DZ         inter-rafter insulation

          DI Roof internally insulated (below the supporting structure)

Source: bauwion