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Navigating California Title 24: How YPI High-Performance Glass Hits the Numbers

California Title 24 sets some of the strictest energy performance requirements in the country. For fenestration, that usually means hitting specific U-factors and SHGC (Solar Heat Gain Coefficient) by climate zone. Here’s how we approach it—and how you can use the numbers to your advantage.

What Title 24 Actually Wants

Residential and non-residential projects must meet prescribed U-factor (thermal transmittance) and often SHGC limits. The exact numbers depend on:

  • Climate zone
  • Building type (residential vs. non-residential)
  • Fenestration area and orientation

In many California zones, you’ll see targets like U-factor ≤ 0.30 (or lower) for windows and glazed doors. That’s achievable—but not with every system.

How YPI Systems Are Built for It

Our systems are engineered with Title 24 in mind from the start:

  • Thermal break — PA66 nylon (e.g. Technoform Bautec) and proper cavity design drive down U-factor.
  • Glass — Low-E (double or triple silver) and gas fill (e.g. argon) are standard options that labs use for NFRC simulations.
  • Frame — 2.0mm aluminum with robust thermal break geometry keeps whole-unit performance where it needs to be.

We run NFRC simulations and can provide documentation that architects and energy consultants need for compliance. So you’re not guessing—you’re specifying with paperwork that matches the product.

Using This With Builders

When a builder or architect says “we need to meet Title 24,” the right move is:

  1. Ask for the zone and project type — so you know the exact U-factor (and SHGC) targets.
  2. Provide NFRC-rated options — our certified configurations that meet or beat those numbers.
  3. Leave a paper trail — NFRC reports, product cut sheets, and (where applicable) simulation reports.

That’s how you act as a consultant: you help them hit the numbers and document it. YPI is built to support that role—so you’re not just selling windows, you’re solving the code.

Further Reading

← The Fenestration Brief