How to Choose the Right Curtain Wall Glazing for Your Project

To choose the right curtain wall glazing, match four things to your project: the system type, the glass build-up, your local climate, and your budget. Get those four right and the façade holds up for decades. Get one wrong and you’re looking at leaks, condensation, or a repair bill within a few years.

This guide breaks down that decision step by step, then covers the standards, the manufacturer checks, and the mistakes worth avoiding along the way.

Quick Summary

If you only need one rule to work from: match the system to your building height first, then let climate and standards settle the glass spec.

What Is Curtain Wall Glazing?

Curtain wall glazing is the glass and aluminium framing that forms a building’s outer skin, and it carries no structural load of its own.

It hangs off the building’s frame, almost like a curtain, and passes wind and gravity loads back to the main structure instead of supporting them itself. That’s the whole difference between a curtain wall and an ordinary load-bearing wall.

You’ll see it on office towers, hospitals, hotels, airports, and mixed-use buildings. Anywhere a project calls for large sheets of glass without a punched-window look.

How to Choose Curtain Wall Glazing: A 4-Step Framework

Work through building height, climate, load standards, and budget in that order, and the right glazing choice becomes obvious rather than guesswork.

Step 1: Match the System to Your Building Height

Low-rise buildings usually do fine with stick-built glazing, while mid-rise and high-rise towers need unitized systems.

Height changes everything about install risk. A three-storey building can afford the slower, on-site assembly of stick-built framing. A twenty-storey tower can’t, because every extra week on scaffolding adds cost and weather exposure. Start here before you look at anything else.

Step 2: Match the Glass to Your Climate

Hot climates need solar control glass and low-E coatings, cold climates need thermally broken frames, and coastal sites need corrosion-resistant finishes.

Skip this step and you’ll find out the hard way, usually through condensation on the inside of the glass or a spike in the cooling bill during the first summer. Climate should shape the glazing spec before the architect even finalises the façade design.

Step 3: Check Wind Load and Safety Standards

A structural engineer needs to calculate design pressure for your exact site and height before any glazing gets ordered.

Glass thickness, mullion depth, and anchor spacing all come out of that calculation. Ordering glazing before this step is done is one of the most expensive mistakes we see on façade projects.

Step 4: Balance Budget Against Timeline

If your budget is tight but your timeline is flexible, stick-built glazing usually costs less. If your timeline is tight, unitized glazing is worth the higher upfront price.

Types of Curtain Wall Glazing Systems

There are three main types of curtain wall glazing: stick-built, unitized, and structural. Each one suits a different scale of project.

1. Stick-Built Curtain Wall Glazing

Stick-built glazing is assembled piece by piece directly on the construction site.

Vertical mullions go up first, then horizontal transoms, then the glass drops into the grid. It suits low-rise buildings and irregular shapes, and it leaves installers room to adjust on site. The trade-off is a slower build and more exposure to weather delays.

2. Unitized Curtain Wall Glazing

Unitized glazing arrives on site as pre-assembled, factory-glazed panels, usually one storey tall.

A crane lifts each panel into place, and workers clip it onto anchors fixed to the structural frame. Because every panel is tested before it leaves the factory, quality control is tighter, and installation on tall buildings moves noticeably faster.

3. Structural (Frameless) Glazing

Structural glazing holds the glass with silicone or point-fixed fittings instead of a visible frame.

It gives a sleek, almost frameless look that architects reach for on flagship buildings and lobbies. It also costs more and needs precise engineering, so it tends to work best on feature façades rather than an entire tower.

Curtain Wall Glazing Standards and Certifications

Curtain wall glazing has to meet recognised testing standards before it can be specified on a commercial project.

ASTM and AAMA set the test methods used across North America. CWCT and CE marking cover the UK and Europe. Confirm which one applies to your project’s location before you sign off on a spec sheet.

Stick-Built vs Unitized Curtain Wall Glazing: Quick Comparison

Stick-built glazing fits smaller, budget-driven projects. Unitized glazing fits taller buildings running on a tight schedule.

How to Vet a Curtain Wall Glazing Manufacturer

Check factory ownership, test certificates, and real project history before signing a contract with any curtain wall glazing manufacturer.

1. Confirm they own the factory rather than reselling from a trading company
2. Ask for test reports against ASTM, AAMA, or CWCT standards
3. Request photos or video of live production, not just renders
4. Check their export experience to your region and its building codes
5. Ask how design changes and shop drawings get handled before production starts

Common Mistakes to Avoid When Choosing Curtain Wall Glazing

Most curtain wall glazing failures trace back to one of a handful of avoidable mistakes made early in the project.

1. Choosing glass thickness before a wind load calculation is done
2. Ignoring local climate when picking coatings and seals
3. Ordering from a trading company instead of the actual factory
4. Skipping third-party test certificates to save time
5. Locking in a system before the building height is finalised

Why Choose Starveil Windows for Your Curtain Wall Glazing

Starveil Windows manufactures every curtain wall system in-house, so you’re buying from the factory floor and not through a trading middleman.

Our 45,000 m² factory in Foshan has run for 28 years and delivered more than 1,500 projects across 118 countries, with certifications matched to each region, including NFRC and CSA for North America, CE marking for Europe, and AS2047 for Australia and New Zealand.

Every curtain wall system we ship is designed, engineered, and glazed under one roof, so what you approve in the drawings is what turns up on site. Our team also provides free 3D renderings, on-site installation guidance, and DDP shipping to more than 100 countries.

If you want a manufacturer that stands behind its curtain wall glazing from the first drawing to the final panel, our team can walk you through the right system for your project.

Ready to Choose the Right Curtain Wall Glazing?

Contact Starveil Windows today for a free curtain wall glazing quote, and let our engineering team match the right system to your project.

FAQs

What is a curtain wall glazing system?

A curtain wall glazing system is a non-structural, glazed exterior wall that hangs from a building’s frame. It sends wind, gravity loads back to that frame instead of carrying them itself.

What is the difference between curtain wall and glazing?

Curtain wall is the entire façade system, including the framing, anchors, and seals, while glazing refers only to the glass panels fitted inside that framing.

Are curtain walls double glazed?

Most curtain walls use double-glazed insulated units for better thermal performance, though triple glazing shows up in colder climates and single glazing still appears in a few low-load spandrel areas.

How thick is curtain wall glazing?

Curtain wall glazing usually runs from 6 mm to 12 mm per pane inside a sealed unit, with the exact thickness set by panel size, wind load, and local safety codes.