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15 percent asbestos 30 percent 85 percent ACCOMPLISHED BY INSULATION air space Aluminum foil applied B.t.u. of heat Batts become too cold bentonite better the insulating blown into place British thermal units building materials Bureau of Mines Bureau of Standards Canadian report compressed condensed moisture conservation of fuel conserving heat convection cubic foot degree-day Diatomite Diatornite economy Expanded vermiculite fibrous filled with mineral floor fuel saving furnace Glass wool glasslike material Gypsum heat loss inches of insulating insulating boards Insulating cements insulating materials insulating value k-factor Loose wool mixed magnesia metal lath Mineral Insulators MINERAL ORIGIN Mineral wool home mineral-wool products molten National Bureau open spaces plaster pumice radiation rafters rock wool rocks or earths saved by insulation SAVED Fuel shale Short tons silica Slag wool space heating square foot storm windows stripping and storm suitable binders surfaces Thermal conductivity various insulating weather stripping wood wool home insulation