Roof Insulation Rigid R Value

I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number.

Roof insulation rigid r value.

All products in the acfoam polyiso roof insulation family are closed cell rigid foam insulation board flat or tapered. This material offers the highest r values about r 6 to 6 5. With premium polyiso manufacturing atlas is able to produce the highest effective r values with minimal material thickness. A rigid roof insulation board with high thermal efficiency johns manville r panel is compatible with multiple types of membrane systems.

R3 r18 r21 total roof r value. Some products have reinforced facing to make them sturdier. The percentage increase increase increase original number 100. Traditional loose fill insulation such as fiberglass or cellulose has an r value between r 2 0 and 3 5 per inch of thickness.

It provides r values that range from 3 6 to 4 2 per inch. When determining how much insulation you need don t guesstimate calculate. The higher the r value the greater the insulation performance. 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.

It provides about r 5 per inch. Know exactly how much you need with our project calculators. 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. Rigid insulation is usually made up of fibrous materials or plastic foams.

Choose this option for areas that need a good amount of strength and water resistance. Jump to specific section. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency.