1 Gather just a few dozen half-gallon plastic containers — milk jugs with their high halves lower off work simply superb. “The extra you will get,” says Alvestad, “the quicker your igloo will rise.”
2 Look forward to a superb robust chilly spell that’s forecast to final no less than every week. “It’s a little bit of a raffle. You might be completely depending on the climate.”
3 Refill the containers with water and depart them exterior in a single day to freeze.
4 As soon as they’re frozen, pop the ice bricks out of their containers (you will have to take them inside for a couple of minutes first to permit them to soften sufficient to return unfastened). Create a circle of ice bricks, cementing one brick to a different utilizing moist snow as mortar. “Don’t neglect to depart a niche for an entry tunnel.”
5 Begin constructing upward by including a second layer of bricks, then a 3rd, and so forth, tilting the bricks inward a bit as you go greater (this may increasingly require you to carry the bricks in place for a minute or two to let the mortar freeze). Over a interval of days — how lengthy relies on what number of bricks you may freeze every evening — proceed constructing upward and inward till you’ve closed the igloo’s roof.
6 Use one other batch of bricks to construct an entry tunnel broad and tall sufficient to crawl by means of.
7 When your igloo is full, spray it with water to provide it a superb icy outer shell.