Why does this man appear to be digging up the roof of a house? Well, this is one way to remove a layer of insulation foam, a layer that Americans usually use to line the roof or walls of their homes in order to keep the indoor temperature stable in both summer and winter. While insulation foam may seem effective, it is not easy to remove. It must be carefully removed because the foam hardens and sticks together, requiring workers to scrape it off piece by piece with a shovel or special tools.#america #american #roof #house #tech #technology #technique #education #facts
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