{"data":{"id":"us-ca/bpc-19020","jurisdiction":"us-ca","citation":"BPC § 19020","heading":"","body":"“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, or\nR-value = 1\nconductance of the material\nwhere the conductance of the material is: Btu (hour × square foot × Fahrenheit degree average temperature difference between two surfaces).","path":["Business and Professions Code - BPC","DIVISION 8. SPECIAL BUSINESS REGULATIONS [18400. - 22949.92.2.]","CHAPTER 3. Home Furnishings [19000. - 19221.]","ARTICLE 1. General Provisions [19000. - 19022.]"],"source_url":"https://downloads.leginfo.legislature.ca.gov/pubinfo_2025.zip","current_through":"2026-09-13","vintage":"","retrieved_at":"2026-09-14T05:56:33Z","sha256":"264ca1a95f26e941df022dd9fe87c9729fce43f7e43e822a5250841b8de97498","source_id":"us-ca","stale":false,"prev":"us-ca/bpc-19019","next":"us-ca/bpc-19021"},"notice":"GroundRules: Original legal text. Not legal advice."}