What is wrong with that sentence?
I live in the land of basements.
Yes, we put additional insulation under slabs but not under ceilings as it serves no purpose.
Installed my first radiant heat ceiling heat system (ESWA foils) in a house I constructed for a client in 1987.
Article contains some popular energy misconceptions promoted by vendors of systems. Many other errors and misrepresentations in the piece as well as a bit of contradictory stuff!!
Specifics are helpful…