Roof Insulation Rigid R Value

R value measures how well certain building insulation materials can resist heat.

Roof insulation rigid r value.

All products in the acfoam polyiso roof insulation family are closed cell rigid foam insulation board flat or tapered. I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. Choose this option for areas that need a good amount of strength and water resistance.

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 insulation is usually made up of fibrous materials or plastic foams. The percentage increase increase increase original number 100. When it comes to insulation performance the difference is in the details.

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. With premium polyiso manufacturing atlas is able to produce the highest effective r values with minimal material thickness. Know exactly how much you need with our project calculators. Some products have reinforced facing to make them sturdier.

The higher the r value the greater the insulation performance. Jump to specific section. It provides r values that range from 3 6 to 4 2 per inch. A rigid roof insulation board with high thermal efficiency johns manville r panel is compatible with multiple types of membrane systems.

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. This material offers the highest r values about r 6 to 6 5.