Black engobed roof tiles / Faster strong heating / Upstairs?

Interesting connection - but it is probably wrong. Heat storage is a matter of mass. A lot of mass stores a lot of heat

.. that's how building physics works

.. so funktioniert die Bauphysik

But unfortunately not the other way around, as can be seen with the example of metal! Despite its high density, it is a good conductor of heat, whereas concrete is a good heat storage. As everywhere in physics and in life, properties cannot be reduced to a single value!

Best regards from the sun

K.Brodbeck