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Washington, D.C., circa 1942. "Conservation of fuel oil -- rock-wool attic insulation." Office of War Information photo. View full size.
Well, 1942 would be good role model for 2017 when it comes to energy conservation. But I guess as long as there is no need, there is no must.
Interesting that the worker is actually using a mask. And a ventilated one at that. With something as "harmless" as ordinary rockwool. If only they had kept that up when asbestos became all the rage.
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