The same document describes the sign shown below as follows: "Interior sign, Type II, size 10" x 14", galvanized steel, 0.018" thick, with partially reflectorized surface and overlays. Used to mark facility entrances." The interior signs were made of steel. If you purchase these poles, instead of chopping them down yourself, you're looking at an average cost of about $20 per log, or $400 for 20 logs.The "Posting Fallout Shelter Signs Handbook" FG-C-8.1 (June 1964) describes the sign below right as follows: "Exterior sign, Type I, size 14" x 20", aluminum, 0.025" thick with partially reflectorized surface and overlays. The poles should over-hang the edges by at least a foot in order to help support the soil on top. Step 4: Once you've dug your trench, lay your wooden poles over top of it. A basic 3-by-11 foot waterproof tarp should run you between $20-$40. Step 3: When completed, place waterproof material over each end of the shelter to form an overhead canopy - this should keep your shelter dry as well as catch any dropping fallout. It should be about two feet wide by three and a half feet deep - it's basically a crawl space and can double as an emergency exit for smaller individuals. Dig this trench just under the ground's surface with an opening to the surface at the end of it. At the other end of the trench, dig a five-foot-long ventilation trench to help circulate air. Step 2: Next, dig a five-foot-long entrance with steps or a slope down into the main area. Account icon An icon in the shape of a person's head and shoulders.
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