About R-Values

The term R-Value is the most popular term used to measure various insulating materials. Unfortunately, what is printed on the bag or on the material itself often gives a poor representation of how the product performs in the field.

In order to better understand how insulating products work it is important to understand what R-Values measure. R-Value is the measurement of resistance of heat flow through a particular product. The higher the R-Value, the greater the product’s resistance to heat transfer.

A number of other terms used when describing a products energy rating:

Thermal Mass Thermal mass such as logs or concrete slow the transfer of heat but do not reduce heat transfer. Advertised R-Value – This is the manufacturer’s stated R-Value for the product as it is tested.

This R-Value is often never achieved in real world applications. Batt type insulation needs a space to full expand in order to achieve its stated R-Value. In practice when insulation is installed it is compressed thereby reducing its stated R-Value.

Likewise, doubling up on fiberglass batts will not double their overall R-Value, in fact it lowers it significantly. This phenomena does not occur with Eurothane GP. The R-Value is in fact its stated value.

R-Value Thermal Imaging

Thermal brakes occur when a conductive material is placed in a wall and comes in contact with the two outer skins of the wall. An example of a thermal break is the studs in a typical frame wall.

It is important to note that metal studs “conduct” cold much more effectively than wood. The answer is to wrap the building with Eurothane PIR insulation boards on the outside of the studs and over the top of rafters creating a complete thermal envelope.

When choosing methods to insulate your home, the products with the greatest return on investment are those products with little or no thermal breaks, that have a high resistance to heat transfer and that can be installed in a manner that conforms to their true R rating.

Eurothane GP consistently performs to its stated R-Value when used in home construction, giving you the greatest value for your money and the highest return on your investment.

Thermal Conductivity

Aged R-Values

Aged R-Value is the long term R-Value of a given insulator. Many factors can affect the long term performance of an insulation product, including dirt, settling, moisture absorption, UV rays, and out gassing.

Out gassing is the only factor which could apply to Eurothane PIR. Out gassing is a process by which fumes or gas ‘escapes’ from a product over time. All living creatures out gas as well as most manufactured products such as cabinets, carpet, paints, and fabrics.

PIR gains its superior R-Value rating due to its unique cell structure and polyisocyanurate’s ability to create a higher density of cells. The PIR used to manufacture Eurothane GP panels is a closed cell, class A rated (BRE Green Guide ), structural foam.

If the surface foam of PIR is exposed directly to atmospheric pressures for an extended period of time and air is allowed to permeate the foam, the outermost cells can rupture, releasing their inert gas and losing their R-Value.

This process takes place over the first two years of the products life and can results in a drop of R-Value of 15%.

Placing a coating or facing directly onto the polyisocyanurate skin can eliminate any reduction of R-Value from out gassing. This fact has been proven in study after study.

Eurothane has a foil facing on both sides which eliminates any out gassing and reduction in R-Value maintaining its outstanding stated R-Value performance.

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