Rigid Roof Insulation R Value Per Inch

Traditional loose fill insulation such as fiberglass or cellulose has an r value between r 2 0 and 3 5 per inch of thickness.

Rigid roof insulation r value per inch.

This material offers the highest r values about r 6 to 6 5. Jm suggests that design professionals use 5 7 r inch as a design specification for its foam products. Asbestos cement board r value. Asbestos loose packed fibers powder.

Eight inches of poor quality insulation may have a higher and better r value than one inch of top quality insulation. Polyiso still remains the highest r value per inch of any available insulation. So you need to know an insulation product s thickness as well as its r value in order to compare it to another product. 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.

Asbestos lagging and paste will have a lower value. Estimated r value of asbestos insulation per inch for pipe insulation corrugated paper. Rigid insulation is usually made up of fibrous materials or plastic foams. Jm is proud to be a pima member and have its product third party certified under the pima quality mark program.

Working with home insulation boards insulation panels typically come in 4x8 foot sheets. Falls in the middle of the three types of rigid foam insulation in both cost and r value used most in walls or below grade applications recyclable and at about r 5 per inch costs around 42 per sq. For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings. Asbestos cement shingle siding.

The same insulation will hold more heat the thicker it is installed. Thermal conductivity k 0 15. It provides about r 5 per inch. Jm revised lttr values.