R Value Rigid Insulation Roof

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R value rigid insulation roof.

Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. It s not about how much heat the insulation retains but how slowly it allows heat to move through it. The higher the r value the better a material performs as a thermal insulator. 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 determining how much insulation you need don t guesstimate calculate. R panel is manufactured with a closed cell polyisocyanurate foam core bonded to fiberglass reinforced facers and designed for use over metal nailable and non nailable roof decks with a variety of membrane systems. 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.

Polyiso is the only foam roof insulation that can be used without the need for an additional thermal barrier. A rigid roof insulation board with high thermal efficiency johns manville r panel is compatible with multiple types of membrane systems. Know exactly how much you need with our project calculators. The slower the better.

Rigid insulation is usually made up of fibrous materials or plastic foams. 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.