I made experiment to check if unmined tile of abyssalite provides better insulation than insulated tiles made of igneous rock and ceramic.
As far I know a non-insulated tiles uses logarithmic mean to calculate value at which transfer between to materials will occur. So I placed 1000kg of gasous mercury(thermal conductivity 8.3) besides a abyssalite tile of 500kg(thermal conductivity 0.0001). All was surrounded by neutronium. I repeated the same for insulated tiles.
The log mean of abys
I haven't seen solid-on-solid sweating so far.
May have something to do with displacement - sweating will not happen if the game doesn't know how to displace the fluids without deleting any. This can often block seemingly obvious sweating sites.
From what I can tell, sweating will always place the newly phase-changed material at the point where phase-changing material was (ie. 1000kg water will be displaced by 5kg steam), except in case of solids, where the sweating instead displaces t