Metal
Stone
Wood
Façade
Ancillary Services
Aluminum Curtain Walls: How to Maintain and Restore Commercial Building Facades
An aluminum curtain wall is a non-load-bearing exterior façade system that uses an aluminum frame to support glass and other cladding materials. Common on office towers, healthcare facilities, hotels and other commercial buildings, these systems protect the building envelope while contributing to energy efficiency and modern architectural design.
Although aluminum is highly durable, curtain walls are constantly exposed to UV radiation, moisture, pollution and other environmental conditions that can affect their appearance and long-term performance. This guide explains how curtain wall systems work, what causes them to deteriorate and when professional restoration may be a more practical alternative to replacement.
What Is an Aluminum Curtain Wall?
While the term curtain wall may sound structural, these systems don’t support the weight of the building. Instead, they attach to the building’s structural frame and serve as the outer skin of the façade, protecting the building from weather while supporting large areas of glass, metal panels and other cladding materials.
Most aluminum curtain wall systems consist of an aluminum frame made up of vertical mullions and horizontal transoms that hold vision glass, spandrel panels and other glazing components in place. Many systems also incorporate thermal breaks, which help improve thermal insulation by reducing heat transfer through the framing.
Because they’re lightweight, durable and flexible in design, aluminum curtain walls are widely used on office buildings, hospitals, hotels, educational campuses and mixed-use developments. They create the clean, contemporary appearance associated with modern architecture while improving daylight, occupant comfort and thermal efficiency.
Although they’re sometimes confused with storefront systems, curtain walls typically span multiple floors and are engineered to accommodate larger expanses of glass and greater structural movement. As these systems age, routine maintenance and facade restoration services can help preserve their appearance and performance without the need for premature replacement.
What Causes Aluminum Curtain Wall Systems to Deteriorate?
Aluminum is valued for its strength, durability and natural corrosion resistance, making it an ideal material for commercial curtain wall systems. However, even the most durable aluminum curtain wall isn’t maintenance-free. Over time, exposure to the elements can gradually wear down protective finishes, affecting both the appearance and long-term performance of the façade.
Several factors contribute to curtain wall deterioration, including:
- UV exposure, which can fade finishes and reduce color consistency
- Oxidation, leading to chalking and finish breakdown
- Acid rain and air pollution, which can stain or etch architectural surfaces
- Salt exposure in coastal environments, accelerating surface degradation
- Water intrusion around aging seals and joints
- Dirt, grime and other environmental contaminants that accumulate over time
- Improper curtain wall cleaning methods or harsh chemicals that damage protective coatings
If left unaddressed, these issues can do more than diminish a building’s appearance. Surface deterioration may expose the underlying finish to further weathering, increase maintenance requirements and shorten the service life of the curtain wall system.
A proactive curtain wall maintenance program helps identify these issues early, allowing property owners to address minor damage before more extensive aluminum facade restoration becomes necessary.
Learn more about preserving surfaces and protecting value and how preventative maintenance can help extend the life of commercial building materials.
Cleaning, Restoration or Replacement: Which Option Is Right?
Not every aging curtain wall requires the same solution. The right approach depends on the condition of the finishes, the extent of the damage and the overall performance of the system.
| Cleaning | Restoration | Replacement |
|---|---|---|
| Removes dirt, stains and environmental contaminants | Repairs oxidation, fading, coating failure and surface deterioration | Replaces damaged curtain wall components or the entire system |
| Best when protective finishes remain intact | Preserves existing materials while restoring appearance | Typically reserved for systems that have reached the end of their service life |
| Routine maintenance | Can extend service life with minimal disruption | Often the most expensive and disruptive option |
Professional assessment is the best way to determine which solution is appropriate. In many cases, restoration can renew the appearance of an aluminum curtain wall and extend its service life without the cost, disruption or lengthy timelines associated with replacement. When structural components have been compromised, however, replacement may be the better long-term investment.
