What is the strict value I.

Rigid insulation is usually a hard foam material that is used to control temperature in buildings. The thermal resistance of this material or efficiency in preventing heat passage is called the strict insulation value R. In general, the strict insulation value R is higher than other materials used as insulators. This usually makes a more efficient choice, although it can also increase costs.

The insulation is designed to help maintain warmer buildings when it is cold, maintaining heat inside and cooler, when it is warm, maintaining hot air outside. The ability to reduce heat flow is usually represented by a positive number called the value R. In general, the higher the insulation value R, the more material protects heat from movement from one side to the other.

One of the main factors affecting the value R is the density of the material. Many forms of Insula, such as Glass Fiber blankets and blownCellulose, are made of loosely woven or wrapped fibers. On the other hand, the solid insulation is usually made, which can be combined more compact together, increasing the density of a comparable one layer. This increased density is one of the primary reasons why strict R isolation is often higher than many other forms of insulation. For example, on average, strict insulation values ​​R are at least twice the values ​​of glass fiber blankets and at least one and a half times a comparable amount of blown cellulose.

Another factor that can affect the value of the insulation is what substances are used to create it. Even different types of solid insulation can have different R values, depending on the base material used. For example, the value of polyiso rigid insulation R is generally 30% to 40% higher than other types of solid insulation. This is because polyiso cells that make up insulation have a special gas that is effective in reducing the thermal flow added inward.

one of the mainThe advantage of solid insulation with higher values ​​R is the ability to use less. For example, if a person wanted to have an R-15 insulation in their attic, but had only limited space for adding, some rigid polyiso foam options could allow only 2 inches (5 cm) insulation, compared to typical 4 to 5 inches (10 to 12.5 cm) of bluces or cellulose that would otherwise be generally required.

The primary disadvantage is that with higher rigid insulation R value usually comes higher initial costs of purchase. However, many experts state that they usually replace the cost of heating and cooling costs over time.