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In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7.
Rigid roof insulation r value per inch. Asbestos corrugated paper pipe insulation. R value per inch ft f hr btu rsi per millimeter k m w r value for typical installed thickness not per inch source. The same insulation will hold more heat the thicker it is installed. As a benchmark one inch of solid wood has an r value of 1.
Built up roof membrane gravel surfaced membrane and gravel only 0 33. Estimated r value of asbestos insulation per inch for pipe insulation corrugated paper. Asbestos cement shingle siding. R value of roofing materials and building insulation.
Asbestos cement board r value. Asbestos lagging and paste will have a lower value. National roofing contractors association. 1 844 446 7858 my account.
Eight inches of poor quality insulation may have a higher and better r value than one inch of top quality insulation. Thermal conductivity k 0 15. Note from this chart that the ideal r value differs for each part of your home. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.
So you need to know an insulation product s thickness as well as its r value in order to compare it to another product.
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