Glasswool Insulation R Value

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2020-06-15

R-value is a measure of thermal resistance, measuring the heat transfer through a material per unit of area. This measure is used widely in the construction trades, both residential and commercial.

The r-value of glasswool insulation and mineral wool insulation varies widely. It really depends on what form the wool is in.

Press or formed rolls and sheets will have a different thermal resistance than loose fill type insulation. Blown glasswool insulation r value is approximately R-3.1 to R-4.0.

Glasswool R Values in Practice

In general, you can increase the r-value of a given wall by increasing the thickness or density of the insulator. For a simple example, if you were to triple the thickness of fiberglass batting in a wall cavity, the r-value would also triple.

However, if you were to forcibly press two layers of insulation into the thickness of one, you will get more r-value but most likely not a double r-value because it is improperly installed.

The r-value published by manufacturers applies strictly to insulation that is installed in a proper fashion.

Finishing off a wall with paneling or sheet rock does not provide a substantial additional r-value.

R-Value Units

R values are usually given without their units, so it can be confusing what a value of “R-4.0” refers to. In most places in the world, the r value is given in international system of units (SI), while in the United States it is more common to use traditional US units.

The trick to remember is US r-values are around 6 times larger in magnitude than SI r-values. If you have an understanding of that you can quickly decipher what units you are dealing with.

SI units: m²•K/W US units: ft²•°F•h/Btu.