Hi, I am just starting with my Kfw40 construction.
Insulation is described at the very bottom in my building blog in case you're interested.
Hausbau - becker. blogspot. de
Floor slab: 0.14 W/m²K
Exterior wall: 0.12 W/m²K
Roof: 0.14 W/m²K
Additional costs compared to KfW55:
- €8370 exterior wall insulation
- €1053 roof insulation
- windows +3%