R Value Rigid Insulation Roof

A rigid roof insulation board with high thermal efficiency johns manville r panel is compatible with multiple types of membrane systems.

R value rigid insulation roof.

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. Atlas acfoam products contain a polyiso core which achieves higher effective r values the capacity to resist heat flow with minimal material thickness. Jump to specific section. R value is used as a measurement of the effectiveness of thermal insulating materials.

The higher the r value the greater the insulation performance. A higher r value means that the insulation will do a better job of holding in conditioned air whether that s heat in the winter or cool air in the summer. Polyiso is the only foam roof insulation that can be used without the need for an additional thermal barrier. When determining how much insulation you need don t guesstimate calculate.

The slower the better. 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 higher the r value the better a material performs as a thermal insulator. R value measures how well certain building insulation materials can resist heat.

Rigid insulation is usually made up of fibrous materials or plastic foams. It s not about how much heat the insulation retains but how slowly it allows heat to move through it.