Section R906 — ROOF INSULATION — 2025 California Residential Code (Title 24, Part 2.5)

R906.1 General. ¶

R906.1 General. Where above-deck thermal insulation is installed, such insulation shall be covered with an approved roof covering and shall comply with NFPA 276 or UL 1256.

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R906.2 Material standards. ¶

R906.2 Material standards. Above-deck thermal insulation board shall comply with the standards in Table R906.2. TABLE R906.2—MATERIAL STANDARDS FOR ROOF INSULATIONCol2 ------ MATERIALSTANDARD Cellular glass boardASTM C552or ASTM C1902 Composite boardsASTM C1289, Type III, IV, V or VI Expanded polystyreneASTM C578 Extruded polystyrene boardASTM C578 Fiber-reinforced gypsum boardASTM C1278 Glass-faced gypsum boardASTM C1177 Mineral wool boardASTM C726 Perlite boardASTM C728 Polyisocyanurate boardASTM C1289, Type I or II Wood fiberboardASTM C208

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking

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