R- (insulation) - wikipedia, free encyclopedia, The r-value is a measure of thermal resistance used in the building and construction industry. under uniform conditions it is the ratio of the temperature difference. Why - values matter energy efficiency : home systems, When we talk of insulation, the term r-value inevitably enters the conversation. a wall is r-19, a roof is r-30 — what does this mean?. Types insulation | department energy, What does this mean for me? insulation saves money and improves comfort. consumers can choose among many types of insulation. <.

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