Underground Quonset Homes "Under $3,000" With Heat, Water and Real Beds. Then the Ceiling Sweats

A $3,000 underground Quonset home with heat, water and real beds. The kit alone starts at $3,600, and under four feet of Ohio dirt the bare steel ceiling sweats from December into May. This video prices the pitch first. HomeGuide puts a 20 by 30 Quonset kit at $3,600 to $12,000 before site prep and installation labor, and $12,000 to $30,000 installed. SteelMaster's 20 by 20 garage kit starts at around $7,000. Then it works out what the ground under Columbus, Ohio actually does across a year, using the 1965 National Bureau of Standards earth temperature tables. Four feet down runs from about 39 to 67 degrees, a month behind the surface. A room held at 70 degrees and 50 percent humidity has a dew point of about 50 and a half, and bare steel in dirt that deep sits below it for about 162 days. Digging deeper mostly moves the wet months into June. And the zinc on galvanized steel wears away in soil at anywhere from 0.2 to 20 microns a year, depending on the dirt. Then what a builder who actually puts Quonset huts underground does about it. Foam sprayed on the steel, shotcrete over the foam, a pond liner to shed the rain, a site that drains, and about 80 feet of sloped pipe that dries the air before it comes in. None of that comes in a $3,600 kit. Sources cited: Kusuda and Achenbach, Earth Temperature and Thermal Diffusivity at Selected Stations in the United States, National Bureau of Standards Report 8972 (1965). Lawrence, The Relationship between Relative Humidity and the Dewpoint Temperature in Moist Air, Bulletin of the American Meteorological Society (2005). HomeGuide Quonset hut cost guide. SteelMaster 20 x 20 garage kit page. American Galvanizers Association, Galvanized Steel Performance in Soil. STRUCTURE magazine, Increase Steel Service Life Using Hot-Dip Galvanizing (December 2015). Kirsten Dirksen, Building Bunker Villa on a budget using Quonset Hut structure (2024), with builder David of Viking Shelters. More building physics, worked out with the numbers: www.youtube.com/@TheMeasuredHouseYT