California Title 24 and Your Roof Replacement: What Homeowners Need to Know

Title 24 applies to your roof replacement specifically in two situations: 1. Low-slope or flat sections. On any roof slope below 2:12, Title 24 requires a cool roof with minimum solar reflectance (typically 0.63 initial / 0.50 aged for low-slope non-residential, residential rules slightly more lenient). Older built-up roofs and dark single-ply membranes don't pass without a coating or a reflective-membrane material. PVC single-ply systems pass natively. 2. Steep-slope sections in some climate zones. For Marin (Climate Zone 3), residential steep-slope roofs (above 2:12) generally do not require a cool roof under current standards — but they do require the attic insulation to be brought up to current minimum R-values when you re-roof. The 2025 standards expanded conditions where attic insulation becomes a roof-replacement trigger. 3. Permit + HERS verification on cool-roof installs. Compliance is documented either through the prescriptive path (use listed cool-roof products) or the performance path (HERS-rater calculation). Most North Bay roofers default to the prescriptive path. Most Marin or Sonoma single-family homes with conventional shingled steep roofs and a small low-slope porch section pass the steep-slope rules without material changes — but the porch section often needs an upgrade to a cool-rated membrane.

Where homeowners get blindsided: - Discovering the cool-roof rule mid-project. A quote that doesn't mention Title 24 will reveal the requirement when the permit application gets reviewed — or worse, when the city inspector shows up. - Cheap quote ignores attic insulation. When the attic is open during re-roof, that's the cheapest possible time to add insulation to current R-30 to R-38 standard. The cheap quote skips it; the next homeowner finds out at sale time. - "We'll just paint it white" promises. A coating can bring a non-cool membrane into compliance — but only specific listed coatings count, and only if applied per spec. A roller of cheap white paint is not Title 24-compliant. - Confusing Class A fire rating with cool-roof rating. Both are required in WUI zones with low-slope sections, but they're separate ratings. A Class A SBS shingle is not automatically cool-roof compliant on low-slope. See Class A Fire-Rated Roofs for WUI Zones. - Skipping the permit to skip Title 24. Catches up at resale (buyer's inspector flags it) or at insurance renewal (no permit record for a recent re-roof).

Every Northern Pacific quote handles Title 24 explicitly. If your roof has low-slope sections, we specify a cool-roof-rated product line item; if your attic insulation falls below current code, we line-item it as an optional add — never a hidden upcharge. We pull the permit. We schedule the city inspection. We hand you the documentation at the end. We're GAF Master Elite and Malarkey Emerald Certified. Both manufacturers maintain comprehensive cool-roof product lines (GAF TimberCrest CR, Malarkey Vista AR). On low-slope and flat work, we install PVC single-ply membrane, which is natively Title 24-compliant without coatings or workarounds. CA Lic. #812250. When a competing roofer quotes a job that ignores Title 24, we'll show you the relevant section of the California Energy Code in writing. We're not the cheapest quote; we are the quote that doesn't fail inspection.

If you're getting quotes and Title 24 is missing from the conversation, that's a red flag. Get a written quote that names the cool-roof products, the attic insulation upgrade (or explicit waiver), the permit allowance, and the inspection plan. Get a free roof estimate Call (415) 456-3482 For the cost implications, see Roof Replacement Cost in Marin County. For the related fire-code rules, see Class A Fire-Rated Roofs for WUI Zones.