Whose shelter is burning at -12 seconds in this video? Anyone recognize it? https://www.facebook.com/video.php?v=2328928590698967 Dryer does make a friction fire easier, but dry in a desert at 100 degrees is a lot easier that dry in the cold at zero. The ignition temperature of wood is the same and you have to work harder to make an ember. As Nathan said, the wood in the arctic is too hard for good friction fires. His cedar board is from much farther south. Not sure what you mean by debris shelters. Most of them are insulating the walls with debris. I don't see much insulation on the tops of the shelters. A lot of heat lost from the roofs and floors. Hard to insulate the floors. Debris would be too flammable. Jordan does have a moose hide to insulate his floor. Hair and hide is not flammable.