Which of the following is NOT a residential roof system commonly used in California?

• A. Asphalt shingles
• B. Clay or concrete tile
• C. Metal roofing
• D. Rubber membrane roofing

Answer: (D)

Rubber membrane roofing is not commonly used as a residential roof system in California. It’s a flat or low-slope membrane system (like EPDM or TPO) that’s typical for commercial buildings where a seamless, water-tight sheet is advantageous. Most California homes have pitched roofs, and the options that fit that style are asphalt shingles, clay or concrete tile, and metal roofing. Asphalt shingles are popular for cost and ease; clay or concrete tile is common in sunny, fire-conscious areas for durability and look; metal roofing is chosen for longevity and lighter weight. Because a rubber membrane system is primarily designed for flat or very low-slope commercial projects rather than typical residential rooftops, it isn’t commonly encountered on California houses, making it the correct choice.