R-Value

R-Value

R-Value is the standard measure of thermal resistance used to evaluate insulation materials in construction. The 'R' stands for resistance to heat flow, and higher R-Values indicate better insulating performance. In San Diego's climate with cold winters and hot summers, choosing appropriate R-Values is critical for energy efficiency and comfort.

Why It Matters for San Diego Homes

San Diego's elevation and temperature extremes demand proper insulation. The International Energy Conservation Code (IECC) requires specific minimum R-Values for different parts of your home: R-49 to R-60 for attics, R-13 to R-21 for walls, and R-30 for floors over unconditioned spaces. Meeting these standards reduces heating and cooling costs significantly—properly insulated homes can save 15-20% on energy bills annually.

Common Applications

• Attic insulation: Blown-in cellulose or fiberglass batts at R-49 minimum
• Wall cavities: R-13 to R-21 depending on wall thickness and insulation type
• Basement walls: Rigid foam or spray foam at R-15 to R-19
• Crawl spaces and floor systems: R-30 insulation between floor joists
• Around windows and doors: High R-Value materials to prevent thermal bridging