The combination of Aircrete/Ytong and external insulation of granitewool/woodfibreboard is at the other end of the scale, has a very high density, and a decrement delay of 12 hours or more.
This means it lets the midday heat into the house at midnight and you get little variation in heat levels between day and night, about 2-3 degrees.
Concrete lets out its heat in a couple of hours and polysterene is about the same.
Concrete is also a cold material and has chemicals added to make it go off quickly and these are offgassed into the living area.
The combination of Aircrete/Ytong and external insulation of granitewool/woodfibreboard is at the other end of the scale, has a very high density, and a decrement delay of 12 hours or more.
This means it lets the midday heat into the house at midnight and you get little variation in heat levels between day and night, about 2-3 degrees.