TIL about how the Vikings used the sod roof as an insulator method, it helped keeping their houses warm at winter and cold in the summer, it also helped prevent fires and floods.

https://www.sciencedirect.com/science/article/abs/pii/S1618866717300055
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1g5cs1b/til_about_how_the_vikings_used_the_sod_roof_as_an/