Cool Roof Rules for a Stockton Reroof

Cool roof rules require many California reroofs to use roofing that reflects more sunlight and sheds heat. Here's how the 2025 rules apply to a Stockton-area home, with links to the official sources.

Probably, if you're replacing most of a sloped roof. Lathrop's reroof handout spells out a common trigger: more than 50% of the roof's exterior surface replaced on a roof sloped 2:12 or steeper. Small repairs don't trigger it.

California's 2025 Building Energy Efficiency Standards took effect January 1, 2026, according to the Cool Roof Rating Council.

Most Stockton-area homes fall in Climate Zone 12, but always check your exact address in the California Energy Commission's climate zone tool. The zone sets which numbers apply.

An aged solar reflectance of 0.20 and thermal emittance of 0.75, or an SRI of 16. That's what the CRRC chart of the 2025 code lists for a single-family steep-slope reroof in Climate Zone 12.

Lathrop's handout lists a lower target for heavy products (5 pounds per square foot or more, like concrete or clay tile): aged solar reflectance 0.15 or SRI 10. Ask your roofer which values your city applies to tile.

The CRRC chart lists a separate low-slope target for Climate Zone 12: aged solar reflectance 0.63, emittance 0.75, or SRI 75. Roof deck insulation can be used instead of the reflectance. Patio covers and additions with low-slope roofs may need a white or light membrane.

The CRRC chart lists several equivalent options for steep-slope reroofs in Climate Zone 12. If one applies, a darker roof may still be allowed:

• Ceiling insulation of R-38, or a ceiling U-factor of 0.025 or lower
• A qualifying radiant barrier
• Continuous insulation of R-2 or more above the roof deck
• No ducts in the attic (listed for Climate Zones 2, 4, 9, 10, 12 and 14)
• Roof area covered by building-integrated solar
• Heavy roof constructions of 25 pounds per square foot or more

Your roofer documents the chosen path on the state compliance form.

Look for a Cool Roof Rating Council label. Lathrop's handout says roofing products must be tested and labeled by the CRRC and listed in its Rated Product Directory. Your bid should name the product line and color.

It depends on where you live:

No. Many shingle and tile colors meet the 0.20 aged reflectance target, including some grays and tans. Very dark colors are the ones most likely to fall short. Ask for the CRRC numbers on the colors you like.

• Which product and color will you use, and what are its CRRC aged reflectance and SRI numbers?
• Are we using an exception instead, like attic insulation or a radiant barrier? Which one?
• Which energy form will you file, and will I get a copy?
• Does the cool roof product change your price or warranty?

A dark roof can get much hotter than the air in full sun, and that heat moves into the attic and the rooms below. A more reflective roof stays cooler, so the air conditioner works less on long Valley summer afternoons. An NWS climate study of Stockton counted about 15 days over 100°F in a typical summer (NWS memo WR-79, 1975).

The CRRC chart's exception covers roof area under building-integrated solar, meaning panels that are part of the roof itself. Standard rack-mounted panels sit above the roofing. If you have rack-mounted panels, ask your roofer how they'll handle the roof under and around them, and whether your city wants the whole roof to meet the target.

See reroofing with solar panels for how panel removal works.

Most major shingle brands sell rated cool colors, so the rule doesn't always add cost. The bid can change when you want a very dark color and pick an insulation or radiant barrier exception instead, or when you switch to tile. Ask each roofer to price the same product and color, so you can compare bids fairly.

• Picking a color from a sample board without checking its CRRC rating.
• Assuming an overlay or partial reroof is exempt. Check the trigger with your permit office.
• Forgetting the low-slope patio cover. It has its own, higher target.
• Letting the job start before the energy form is filed with the permit.

1. Confirm your climate zone with the state lookup tool.
2. Choose two or three colors you like, and ask for their CRRC numbers.
3. Decide with your roofer whether you'll meet the target or use an exception.
4. The roofer files the permit and the energy compliance form.
5. The inspector checks the label at the job, and the roofer completes the final paperwork.

A small repair that replaces a few shingles or tiles doesn't trigger the cool roof rule. A partial reroof can, depending on how much of the roof is replaced. Lathrop's handout uses more than 50% of the roof surface as the trigger. If you're replacing one side of the roof now and the other later, ask your roofer how the permit office will count it.

At the inspection, the inspector may look for the Cool Roof Rating Council label on the product packaging to confirm it matches what was approved. Keep the label or a photo of it. If the roofer switched products, the label won't match the paperwork, and the job may not pass until it's sorted out.

For permits: the Stockton Permit Center, (209) 937-8561, or San Joaquin County's Building Division, (209) 468-2098. For rules: the California Energy Commission's climate zone and code pages. For product ratings: the Cool Roof Rating Council.

Related: roof replacement in Stockton and our license check guide.