The same insulation will hold more heat the thicker it is installed.
Rigid roof insulation r value per inch.
Estimated r value of asbestos 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.
The reflective foil facing makes it an excellent insulation board when radiant heat is involved.
Most often used in roofing applications average cost of 70 per sq.
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.
When it comes to insulation performance the difference is in the details.
Asbestos corrugated paper pipe insulation.
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.
Polyisocyanurate also known as polyiso is seen in all kinds of commercial building applications and more recently with residential building projects.