Where Window U-Factor and SHGC Appear: CF1R, Plan Set, Label and Installer Certificate
The same two numbers travel through four documents: the CF1R, a window schedule on the plans, the label on each product and the installer certificate. The plans examiner checks the schedule against the CF1R, the inspector checks the labels at rough frame, and the installer certifies the match on site.
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The CF1R and the plan set
The CF1R is where the compliance values originate. The compliance manual tells plans examiners to confirm that the window and skylight U-factor and SHGC from the CF1R appear on the architectural or structural plans in a window and skylight schedule, or a legend on the floor plan. When windows are averaged, worksheet CF1R-ENV-02-E carries the area-weighted U-factor and CF1R-ENV-03-E the SHGC.
The product label
Each manufactured product arrives with a temporary NFRC label or a temporary default label that stays on until the building inspector has verified it. A default label reads "CEC Default U-factor" and "CEC Default SHGC" followed by the table value. Site-built products rated through NFRC carry a label certificate instead, with a permanent label or certificate also required.
The inspector's visit
At the rough frame inspection, after the windows are installed and before insulation, the inspector verifies the installed U-factor and SHGC. Section 110.6(a)6 acceptance testing of site-built fenestration applies to buildings other than single-family, so no field test is added for a house.
The installer's certificate
Before installation, the installer or responsible person fills in the installation certificate (CF2R-ENV-01-E, Fenestration Installation) and confirms:
- maker, brand and model match the plans or energy forms;
- each product has its temporary NFRC or default label;
- the compass orientation of each unit is written on the certificate.
If a product has no NFRC label, the installer checks with the responsible person that it meets the specification. The installer signs the declaration, leaves a copy on site, and gives copies to the owner and the enforcement agency. The owner also receives a warranty certificate of 10 years or more.
Where numbers drift
A substituted model, a missing orientation or a label that disagrees with the schedule are the mismatches these checks exist to catch. Changing windows after the report is a separate problem, covered on changed windows after the CF1R.
See also NFRC labels, which CF1R form applies and the CF2R. Our residential reports list the values to copy.
Common Title 24 Questions
- When is Title 24 required for a home?
- Does a remodel need Title 24?
- Does a room addition need Title 24?
- What plans are needed for a residential Title 24 report?
- How much does a residential Title 24 report cost?
- How long does a residential Title 24 report take?
Frequently Asked Questions
The manual has the plans examiner verify the CF1R window and skylight values in a schedule or legend on the plans, so yes, show them.
No. The acceptance requirement in Section 110.6(a)6 covers site-built fenestration in buildings other than single-family.
Explore U-Factor and SHGC
- Are Double-Pane and Low-E Windows Required in California?
- Dynamic Glass and Electrochromic Windows Under Title 24
- Mixing Window Types: How the Area-Weighted Average Works and What to Do When One Misses
- Title 24 U-Factor vs SHGC: Which Number Matters?
View all U-Factor and SHGC guides → · Windows and Building Envelope · Title 24 guide