§ 19020

California Business and Professions Code · 2026 edition · updated 2026-10-04 · California

“R-value” means a measure of thermal resistance of material or composite materials. “R-value” is equal to the reciprocal of the conductance of a given material, orR-value =1 conductance of the material where the conductance of the material is: Btu (hour × square foot × Fahrenheit degree average temperature difference between two surfaces).

(Added by Stats. 1984, Ch. 1456, Sec. 3.)

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California Business and Professions Code

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