Encyclopedia > R-value

Article Content

R-value

The R-value is a measure of thermal resistance used in housing insulation. It is defined as R = ft² F° h / Btu.

For comparison, the SI unit of thermal resistance is R = K.m²/W, and 1 ft² F° h / Btu = approx. 0.1761 K.m²/W.

All Wikipedia text is available under the terms of the GNU Free Documentation License

Search Encyclopedia

Search over one million articles, find something about almost anything!

Featured Article

Quackery

... receive money for a consultation, without giving any treatment. Mistakes made by doctors are also reported extensively by the media. The regulatory committees of medical ...