Changed the Insulation or Wall Framing After the CF1R: What to Do
The inspector compares the installed R-value and assembly with the CF1R at the insulation inspection, which comes before drywall. If the value is lower, the product differs or the framing depth changed, either reinstall to match or send amended plans and certificates to the building department before the walls are closed.
- Choose your report
- Upload your plans
- Pay securely
- Permit-ready report by email
The inspection that catches it
The third site visit is the insulation inspection, after wall, ceiling and floor insulation go in and before drywall. The inspector confirms that the R-value matches the CF1R and that there are no compressions, voids or gaps, including behind piping and tubs. The plans examiner has already compared the insulation and wall, ceiling and raised-floor construction on the plans with the CF1R, so a field change departs from approved paper.
Same R-value, different product
All insulation must be certified by the Department of Consumer Affairs, Bureau of Household Goods and Services, for thermal performance (Section 110.8(a)). The installer certifies what went in on CF2R-ENV-03-E, so name the actual product and R-value there. A swap that matches or beats the CF1R value does not by itself break compliance, but the department decides whether it wants amended paperwork.
A lower value or a different stud depth
A new house is judged by assembly U-factor: the prescriptive package sets 0.048 for framed walls in most zones and 0.065 in zones 6 and 7. A 2x4 cavity swapped for 2x6, or exterior foam dropped, is a different assembly. Additions use fixed cavity values: extending an existing wood-framed wall takes R-15 in 2x4 framing or R-21 in 2x6, with no continuous insulation required where the siding stays.
When quality insulation installation applies
An ECC-Rater verifies quality insulation installation (QII) in two stages, each with its own certificate: ENV-21-H at framing and ENV-22-H at insulation. It applies to new homes in every climate zone and to additions over 700 square feet. If the insulation or framing changes after the framing visit, tell the rater before the cavities are covered.
Before the drywall goes up
Photograph the cavities, keep the product labels and the installer's signed certificate, and ask the department which changes it wants amended under Section 10-103(a)2B. Requirements by assembly are on insulation requirements, wall insulation and quality insulation installation. Other swaps are sorted in the amended CF1R quick reference, and revised reports start at our residential reports.
Common Title 24 Questions
- What is Title 24?
- Do I need a Title 24 report?
- How much does a Title 24 report cost?
- How long does a Title 24 report take?
- What is included in a Title 24 report?
- What plans do I need to upload?
Frequently Asked Questions
The manual tells the inspector to look behind piping and obstructing objects like a bathtub. Fill the gaps and ask for the insulation inspection again before drywall goes on.
Only if it delivers at least the R-value or assembly the CF1R lists and is certified under Section 110.8(a). Name it on the installer certificate and tell the department.
Explore Title 24 Revisions
- The Solar System Is a Different Size Than the CF1R: What to Do
- 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?
- Title 24 for a Permit Revision After Plan Check
View all Title 24 Revisions guides → · Permits and Compliance · Title 24 guide