Rigid Roof Insulation R Value Per Inch

Asbestos loose packed fibers powder.

Rigid roof insulation r value per inch.

Jm suggests that design professionals use 5 7 r inch as a design specification for its foam products. Smaller sizes are also available. It provides about r 5 per inch. So you need to know an insulation product s thickness as well as its r value in order to compare it to another product.

This material offers the highest r values about r 6 to 6 5. Traditional loose fill insulation such as fiberglass or cellulose has an r value between r 2 0 and 3 5 per inch of thickness. Jm revised lttr values. Asbestos corrugated paper pipe insulation.

Asbestos cement board r value. Thermal conductivity k 0 15. Products with foil facing help the panels resist moisture vapor. Eight inches of poor quality insulation may have a higher and better r value than one inch of top quality insulation.

Asbestos lagging and paste will have a lower value. For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings. Working with home insulation boards insulation panels typically come in 4x8 foot sheets. The same insulation will hold more heat the thicker it is installed.

Polyiso still remains the highest r value per inch of any available insulation. Estimated r value of asbestos insulation per inch for pipe insulation corrugated paper. Rigid insulation r value by comparison usually ranges from r 4 0 to 6 5 and may get as high as r 8 7 depending on the insulation material. Rigid insulation is usually made up of fibrous materials or plastic foams.