Polyiso is typically used with a foil facing and it has an r value of 7 0 to 8 0 per inch of thickness.
Rigid roof insulation r value per inch.
Estimated r value of asbestos insulation.
The same insulation will hold more heat the thicker it is installed.
The reflective foil facing makes it an excellent insulation board when radiant heat is involved.
When it comes to insulation performance the difference is in the details.
For a 1 in thick panel may vary based on region standard r value of r 5 8 per inch the manufacturing process starts with liquid foam not recyclable has to be sprayed against a substrate to form a rigid panel so all iso panels are faced.
Traditional loose fill insulation such as fiberglass or cellulose has an r value between r 2 0 and 3 5 per inch of thickness.
Asbestos corrugated paper pipe insulation.
All products in the acfoam polyiso roof insulation family are closed cell rigid foam insulation board flat or tapered.
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.
Eight inches of poor quality.