R Value Rigid Insulation Roof

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R value rigid insulation roof.

R value is used as a measurement of the effectiveness of thermal insulating materials. Rigid insulation is usually made up of fibrous materials or plastic foams. When determining how much insulation you need don t guesstimate calculate. A rigid roof insulation board with high thermal efficiency johns manville r panel is compatible with multiple types of membrane systems.

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. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. 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. Atlas acfoam products contain a polyiso core which achieves higher effective r values the capacity to resist heat flow with minimal material thickness.

R value measures how well certain building insulation materials can resist heat. The higher the r value the greater the insulation performance. It s not about how much heat the insulation retains but how slowly it allows heat to move through it. The slower the better.

Know exactly how much you need with our project calculators. Traditional loose fill insulation such as fiberglass or cellulose has an r value between r 2 0 and 3 5 per inch of thickness.