Is this thermal mass floor too thick?
I am currently renovating a earth bermed home. The home has a 10 inch concrete flat roof. I plan to put a second floor on this (above grade) and use direct passive solar gain for heating. The south wall is 32 feet long. I have no choice about the thickness of the thermal mass here. I realize I have plenty of mass but everything I am reading recommends keeping the thermal mass thickness to 4 – 6 inches. Can I accommodate for the increased thickness by going simply going over the 7% rule? I am in climate zone 1 (Canada)