Changed the Roofing After the CF1R: What to Do
Read the label on the product that arrived and compare its aged solar reflectance and thermal emittance with the values the CF1R or its SRI worksheet used. Equal or better is usually fine. A lower rating may be rescued by insulation or a radiant barrier; otherwise amended documents go to the building department.
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The label decides, not the colour name
Section 110.8(i)1 requires any roofing product used to meet the cool roof rules to carry a certified, labelled aged solar reflectance and thermal emittance. The code works from the three-year aged reflectance. An uncertified product gets defaults: 0.08 and 0.75 for asphalt shingles, 0.10 and 0.75 for everything else, both below the 0.20 steep-slope minimum.
The numbers the substitute must meet
On a reroof of more than 50 percent of the roof, a steep-sloped roof in climate zones 4 and 8 to 15 needs an aged reflectance of 0.20 and emittance of 0.75, or a Solar Reflectance Index of 16. A low-sloped roof in zones 4 and 6 to 15 needs 0.63 and 0.75, or an SRI of 75. The SRI route is recorded on the CF1R-ENV-04-E worksheet and lets higher reflectance offset lower emittance, so redo it with the new product's figures. A new home follows Table 150.1-A instead.
If the substitute rates lower
A steep-sloped roof has code equivalents: R-38 ceiling insulation or a ceiling U-factor of 0.025 or less, a radiant barrier, R-2 continuous insulation above or below the deck, or no attic ducts in zones 2, 4, 9, 10, 12 and 14. A construction weighing at least 25 pounds per square foot is exempt. A low-sloped roof instead trades reflectance for deck insulation under Table 150.2-E. A fix that relies on one of these goes to the department as amended plans and certificates under Section 10-103(a)2B.
Part of the roof, or more than half
The code says more than 50 percent of the roof, while the manual's reroof example says 50 percent or more, so a roof replaced exactly in half deserves a call to the department.
What to hand over at final
The plans examiner compares roofing materials, deck insulation, radiant barrier, attic type and cool roof reflectivity with the CF1R, so keep the product label with the invoice. The full rule is on cool roof requirements when reroofing, insulation upgrades covers the deck, and the CF1R for roof alterations names the form. A revised certificate starts at our residential reports.
Common Title 24 Questions
- What is Title 24?
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Frequently Asked Questions
Only if its own aged reflectance and emittance, from its label or listing, meet the line that applies. Check the exact product against the CF1R values, not the brand name.
The cool roof requirement applies where more than 50 percent of the roof is replaced. Where the rule applies, the product must be certified and labelled under Section 110.8(i); ask the department about a smaller job.
Explore Title 24 Revisions
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- Do Lighting Changes After the Report Need a Revised CF1R?
- The House Was Mirrored or Rotated After the CF1R: Is the Report Still Valid?
- The Square Footage Changed After the CF1R: Do I Need a New Report?
View all Title 24 Revisions guides → · Permits and Compliance · Title 24 guide