With premium polyiso manufacturing atlas is able to produce the highest effective r values with minimal material thickness.
Rigid roof insulation r value per inch.
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.
Traditional loose fill insulation such as fiberglass or cellulose has an r value between r 2 0 and 3 5 per inch of thickness.
The same insulation will hold more heat the thicker it is installed.
Polyiso is typically used with a foil facing and it has an r value of 7 0 to 8 0 per inch of thickness.
When it comes to insulation performance the difference is in the details.
Estimated r value of asbestos insulation.
Asbestos corrugated paper pipe insulation.
All products in the acfoam polyiso roof insulation family are closed cell rigid foam insulation board flat or tapered.
The reflective foil facing makes it an excellent insulation board when radiant heat is involved.
Polyisocyanurate also known as polyiso is seen in all kinds of commercial building applications and more recently with residential building projects.