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.
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.
Asbestos corrugated paper pipe insulation.
Polyiso is typically used with a foil facing and it has an r value of 7 0 to 8 0 per inch of thickness.
Polyisocyanurate also known as polyiso is seen in all kinds of commercial building applications and more recently with residential building projects.
The reflective foil facing makes it an excellent insulation board when radiant heat is involved.
With premium polyiso manufacturing atlas is able to produce the highest effective r values with minimal material thickness.
Estimated r value of asbestos insulation.
Eight inches of poor quality.
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.
The same insulation will hold more heat the thicker it is installed.