California CodesBusiness and Professions Code - BPCDivision 8 — Special Business RegulationsChapter 3 — Home FurnishingsArticle 1 — General ProvisionsSection 19020
“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).
Notes
Defines R-value as a measure of the thermal resistance of a material or composite materials, equal to the reciprocal of the material’s conductance. The provision also states conductance in British thermal units per hour, square foot, and Fahrenheit-degree average temperature difference between two surfaces.
Use as reference
Lexinter.net | California Code, Business and Professions Code - BPC § 19020 | https://laws.lexinter.net/codes/california/business-and-professions-code/division-8/chapter-3/article-1/section-19020