Roof Insulation Rigid R Value

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

Roof insulation rigid r value.

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 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. The higher the r value the greater the insulation performance. R value measures how well certain building insulation materials can resist heat.

With premium polyiso manufacturing atlas is able to produce the highest effective r values with minimal material thickness. All products in the acfoam polyiso roof insulation family are closed cell rigid foam insulation board flat or tapered. It provides about r 5 per inch. This material offers the highest r values about r 6 to 6 5.

I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number. When determining how much insulation you need don t guesstimate calculate. The percentage increase increase increase original number 100. The increase r21 r3 exactly 18 the value by which you are increasing the r value.

Some products have reinforced facing to make them sturdier. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. Rigid insulation is usually made up of fibrous materials or plastic foams. When it comes to insulation performance the difference is in the details.

R3 r18 r21 total roof r value. Jump to specific section. Choose this option for areas that need a good amount of strength and water resistance.