The windows were manufactured with exceptionally high R-values [low U-values, 0.90 W/(m2.

A wide range of thermal insulation materials can be used to provide the required high R-values (low U-values, typically in the 0.10 to 0.15 W/(m2.

Its chief values are that it has a higher R-value than other materials and is comparatively inexpensive.

Rigid insulation is provided in spandrel areas to provide a higher R-value at these locations.

Chemical synthetics have a slightly higher R-value (the ability of the material to resist heat flow) than either the natural or mineral products.

In colder climates, insulation materials that have a higher R-value can help trap heat inside the home and lower home heating costs.

Rigid foam is more expensive than fiber, but generally has a higher R-value per unit of thickness.

Padding has higher R-value - which measures a material's ability to keep heat from passing through it - than carpet, keeping the room warmer.

A skylight with a high R-value will remain warm and consequently less condensation will develop.

If a material has a high R-value, it has a greater insulating effect.