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ACCOMPLISHED BY INSULATION air space Aluminum foil Anthracite applied asbestos barrier Bureau of Mines Bureau of Standards Canadian report ceiling and walls Coal comfort conservation of fuel CONSERVING FUEL Convection cubic foot currents of air Degree-days diatomite doors economies exfoliated existing homes fibers floor frame construction Fuel conservation fuel oil fuel saving furnace Glass wool heat by radiation heat loss home owner I. C. 7388 Production inch insulated house insulating boards insulating medium insulating value joists limestone Loose wool magnesia MINERAL INSULATION MATERIALS mineral wool mineral-wool molten National Bureau percent Pipe covering porous rocks pounds per cubic pumice radiate heat rafters redecoration reduce heat rock wool rocks or earths saved by insulation Screened and cleaned shale Short tons Value silica Slag wool space heating space was unfilled spread of fire storm windows sulation surface tests thermal tons Value Short transfer of heat United Value Short tons vermiculite wallboard warmer weatherstripping