this isn't really a problem, i'm trying to understand the table in this link: http://www.nrc-cnrc.gc.ca/eng/ibp/irc/cbd/building-digest-36.html [Broken] basically it shows a wall assembly, it's 70 degrees on the inside, and it gives a list of the materials and their thicknesses in the wall if we look at the gypsum plaster, we see it's conductivity (k) is 5 watts per meters kelvin, which i think means that for every square meter of this gypsum plaster, 5 watts of heat will pass through in an hour or something like that. anyway the next column shows it's conductance, which i think just expresses the conductivity of that material in a certain thickness, so you divide by the thickness. the next column, resistance, is the opposite of conductance. but then i don't understand how they jump from there and conclude that the temperature is going through drop 4 degrees through the gypsum plaster. i'm not sure how they get there. can anyone help explain this to me?