Revisions log for Answer #43
This is the answer to the question Which gets hotter in the sun – WPC or the stone?
Revision 1
If something retains heat well, it already does not conduct heat well. Stone, wood, and plastic are poor conductors of heat. That's why they are used for insulation (there are better ones, of course). Metal, on the other hand, is a perfect conductor of heat. Plastic, on the other hand, is also not a good heat accumulator. Wood and stone are much better.
There is no general statement. It depends on the surface, but above all on the duration of exposure. Basically, I would always use materials with low thermal conductivity. Not only are they slower to absorb heat, but they are slower to release it. A metal plate heated to 60°C seems much hotter than a stone of the same temperature. However, if the sun is hitting the material all day, all materials get very hot.
I would consider WPC and stone on the same level. WPC heats up faster, but if it's so hot you can't walk on it, it's no fun on stone slabs either.