Matt Risinger stumbled upon a very interesting and unique building design in Switzerland, where builders constructed a house entirely out of wood. Even the nails are wooden! As for the walls, they are comprised of several planks of wood to prevent the cold air from coming in. Builders incorporated a wooden insulation exterior instead of standard insulation, which raises the question, what about fire? Isn't wood flammable? It turns out that wood burns at a constant rate", so it's actually safer and buys you more time in the event of emergency. So, to re-cap a house with no insulation," just thick walls—like a real life Lincoln Log home. Tune into the full video to learn more!