Rigid Roof Insulation R Value Per Inch

Eight inches of poor quality insulation may have a higher and better r value than one inch of top quality insulation.

Rigid roof insulation r value per inch.

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. Asbestos cement shingle siding. R value of roofing materials and building insulation. The same insulation will hold more heat the thicker it is installed.

So you need to know an insulation product s thickness as well as its r value in order to compare it to another product. Thermal conductivity k 0 15. As a benchmark one inch of solid wood has an r value of 1. Asbestos corrugated paper pipe insulation.

Our r value guide to rigid insulation includes the doe s recommended insulation by zone chart r value calculator and base building material r values chart. 1 844 446 7858 my account. Built up roof membrane gravel surfaced membrane and gravel only 0 33. R value per inch ft f hr btu rsi per millimeter k m w r value for typical installed thickness not per inch source.

Asbestos loose packed fibers powder. Asbestos cement board r value. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. 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.