A simple step-by-step video on how I make an igloo by myself. Filmed in northern Utah's mountains on a solo February snowshoeing trip in 2014.
The traditional method of igloo building adds the blocks in a continuous upward sloping spiral. That works well, especially if you have an assistant helping you. But when I'm working alone I prefer the concentric ring method shown in this video. Regardless of the method, I try for the igloo roof shape to be about half-way between a true hemisphere and a cone. I believe the technical term for this shape might be a catenary arch or a parabolic arch. I use the string when teaching first-timers to slope blocks at the correct angles, but once you've made a couple of igloos you'll be able to eyeball the cuts just fine without it.
This igloo took me 7 hours to build, but normally I can do it in about 5 hours or less. Being my own camera man for this video added more time than I had anticipated.
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