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.
Asbestos corrugated paper pipe insulation.
Eight inches of poor quality.
Polyisocyanurate also known as polyiso is seen in all kinds of commercial building applications and more recently with residential building projects.
All products in the acfoam polyiso roof insulation family are closed cell rigid foam insulation board flat or tapered.
When it comes to insulation performance the difference is in the details.
Estimated r value of asbestos insulation.
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.
With premium polyiso manufacturing atlas is able to produce the highest effective r values with minimal material thickness.
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.