How to Choose the Right Glass for Your Commercial Storefront
A Decision-Making Guide for Property Managers, General Contractors, and Building Owners
Selecting the right glass for a commercial storefront involves balancing aesthetics, energy performance, safety compliance, and budget. With dozens of glass types, coatings, and framing systems available, the decision can feel overwhelming — especially when California's Title 24 or Arizona's energy codes add another layer of complexity.
This guide walks through the key factors to consider so you can make an informed choice the first time.
1. Start with the Building Code Requirements
Before evaluating products, understand what your local building code requires:
- California Title 24 sets strict energy performance standards for glazing, including Solar Heat Gain Coefficient (SHGC) and U-factor limits. Non-compliant glass will fail inspection.
- Tempered or safety glass is required in hazardous locations — within 24 inches of a door, below 18 inches from the floor, and in any panel larger than 9 square feet.
- Fire-rated glass may be required near exits, stairwells, or property lines depending on occupancy type and construction classification.
- Impact-rated glass is required in certain wind zones, though this is more common in coastal or hurricane-prone regions.
Tip: Ask your glazing contractor to review the plans and flag code-driven glass requirements before you start selecting products. This avoids costly change orders later.
2. Understand the Key Performance Ratings
Every commercial glass product is rated on several performance metrics:
| Rating | What It Measures | Why It Matters |
|--------|-----------------|----------------|
| U-Factor | Heat transfer through the glass | Lower = better insulation, lower energy bills |
| SHGC | How much solar heat passes through | Lower = less cooling load in hot climates |
| VLT (Visible Light Transmittance) | Amount of natural light admitted | Higher = brighter interior, better for retail |
| STC (Sound Transmission Class) | Noise reduction | Higher = quieter interior, important near highways |
For most California and Arizona storefronts, you want low U-factor, low SHGC, and high VLT — meaning the glass insulates well, blocks solar heat, but still lets in plenty of natural light. This combination is achievable with modern Low-E coated insulated glass units (IGUs).
3. Choose the Right Glass Type
Here are the most common options for commercial storefronts:
Single-Pane Clear Glass
- Lowest cost, but poor energy performance
- Rarely meets Title 24 on its own
- Only suitable for interior partitions or non-conditioned spaces
Insulated Glass Units (IGUs)
- Two or three panes separated by an air or argon gas gap
- The standard for modern commercial storefronts
- Can be combined with Low-E coatings for excellent energy performance
Low-E Glass
- Microscopic metallic coating that reflects heat while transmitting visible light
- Essential for meeting Title 24 in California and IECC in Arizona
- Available in different "zones" optimized for heating climates vs. cooling climates
Tempered Glass
- Heat-treated to be 4-5x stronger than standard glass
- Breaks into small, rounded pieces instead of dangerous shards
- Required by code in most storefront applications
Laminated Glass
- Two glass layers bonded with a PVB or SGP interlayer
- Holds together when broken — important for security and safety
- Provides excellent sound attenuation (STC 35-40+)
4. Factor in Climate and Orientation
The glass that works for a north-facing office in San Francisco is wrong for a west-facing retail storefront in Phoenix.
- South and west-facing facades in California and Arizona receive the most solar heat. Prioritize low SHGC and consider tinted or reflective coatings.
- North-facing facades can use higher SHGC glass since solar heat gain is minimal. Maximize VLT for natural daylighting.
- Coastal locations (Santa Monica, Manhattan Beach, Long Beach) should use corrosion-resistant hardware and consider salt-air exposure when selecting frame finishes.
- Desert locations (Phoenix, Palm Springs, Inland Empire) need glass that handles extreme thermal cycling — temperature swings of 40-50 degrees in a single day.
5. Common Mistakes to Avoid
Choosing glass based on price alone. The cheapest glass often fails to meet energy codes, leading to failed inspections and replacement costs that exceed the original savings.
Ignoring the framing system. Glass is only half the equation. The aluminum framing system must be thermally broken and properly rated to match the glass performance. A high-performance IGU in a non-thermally-broken frame defeats the purpose.
Specifying glass too late in the project. Glass lead times can run 4-8 weeks for custom sizes, coatings, or specialty products. Late specification causes schedule delays.
Not considering maintenance access. How will the glass be cleaned and replaced in 10-15 years? Design for serviceability, especially on upper floors.
6. When to Call a Glazing Contractor
The best time to involve a glazing contractor is during the design development phase — before construction documents are finalized. An experienced contractor can:
- Review plans for code compliance issues before they become problems
- Recommend glass and framing combinations that meet performance targets within budget
- Provide accurate lead time estimates for procurement planning
- Identify value engineering opportunities without sacrificing performance
Get Expert Help
Ramos Industries has been specifying and installing commercial storefront glass across California and Arizona for over 35 years. If you have a project in the planning stages, contact us for a free consultation, or call (323) 262-5586 to speak with our team directly.
Licensed in California (C-17 #1034872) and Arizona (ROC #343677).
