Ekotrope | Free R Value Calculator — Ekotrope
Our Free Tools. Ekotrope offers our wall, floor, and roof calculators for free for you to try out. These are also found within Ekotrope RATER. Our calculators are based on the same methodology described by John Krigger Chris Dorsi in their book Residential Energy, supplemented with material from both ASH RAE and RES NET.. The information regarding .