February 24, 2012 6:30 AM
Material: In wind-packed snow, shovel a trench to facilitate cutting the first block. Using a snow knife or snow saw, cut a block 12 inches wide, 24 inches long, and 18 deep. Remove the block from the trench and repeat.
Foundation: Mark the center of the igloo with a stick or ski pole, then trace a circle 6 to 10 feet in diameter. Position blocks along it, using a snow knife to miter the ends for a tight fit.
Construction: Cut a ramp that starts between two blocks and extends halfway around the bottom row. Bevel the tops of the blocks along an imaginary line from the outer edge of the blocks to the igloo's center (1). Trim snow from the bottom of the blocks in higher rows so they touch only at the corners (2), and bevel the tops along the angle of sight to the igloo's center. Stagger the blocks.
Exit Strategy: Dig an exit tunnel, ideally beneath a downhill-facing wall.
Last Steps: Slide the top block (3) sideways through the opening, turn horizontally, and drop into place. Chink gaps between blocks with loose snow. Poke holes for ventilation.
Source: http://www.popularmechanics.com/technology/engineering/gonzo/how-to-build-an-igloo?src=rss
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