Defining the Terms: What Exactly is a Curtain Wall?
A curtain wall is a non-structural external cladding system — a continuous glass and aluminium skin that covers the exterior of a building from floor to floor (or foundation to roof) but carries no structural load other than its own self-weight and the wind/seismic loads it transfers back to the primary structure. The building's structural frame (concrete or steel) stands independently; the curtain wall simply hangs in front of it like a curtain — hence the name.
The curtain wall consists of vertical aluminium mullions (uprights) and horizontal transoms (cross members) forming a grid into which glass panels are inserted and held in place by aluminium pressure caps and EPDM gaskets. From the exterior, you see the glass panels separated by thin aluminium grid lines — a visual signature recognisable on thousands of commercial buildings across India.
Curtain walls have been the dominant facade system for commercial towers, IT parks, hotels and institutional buildings in Jaipur since the early 2000s. The JK Lon Hospital, several Sitapura industrial complexes and numerous Tonk Road commercial developments use curtain wall systems of varying specifications.
What is Structural Glazing — How is it Different?
Structural glazing is a system where the glass panels are bonded directly to the aluminium sub-frame using high-strength structural silicone — there are no visible external pressure caps or aluminium covers. From the exterior, structural glazing appears as a completely flush, seamless glass surface. The aluminium framing is hidden entirely behind the glass plane, creating a mirror-like, uninterrupted facade.
This "no frame visible" aesthetic is the primary reason structural glazing is specified for premium commercial buildings, luxury hotels and corporate headquarters where architectural impact is paramount. When you look at a modern office block and see a perfectly flat, uninterrupted glass surface with no visible grid lines — that is structural glazing.
The structural silicone used must meet stringent engineering specifications. It performs as both an adhesive (holding the glass to the frame) and a sealant (preventing water and air infiltration). The bond is tested to withstand decades of wind cycling, thermal expansion and seismic movement. This is why only approved structural silicone products from manufacturers like Dow Corning, Sika and Tremco are acceptable for these applications.
Quality aluminium is an investment that compounds. Every year it performs better relative to cheaper alternatives that are already degrading.
Stick-Built vs Unitised Curtain Wall — The Construction Method Difference
Within curtain wall systems there is a further critical distinction: stick-built versus unitised construction.
Stick-Built Curtain Wall: In a stick-built system, individual mullions and transoms are installed piece by piece on site, starting from the bottom and working upward. Glass panels are then inserted into the completed grid. Stick-built systems are more flexible for complex geometries, easier to accommodate design changes during construction, and more cost-effective for smaller buildings or projects where schedule pressure is lower. The vast majority of Jaipur commercial buildings use stick-built systems.
Unitised Curtain Wall: In a unitised system, complete floor-to-floor panels (each containing the glass, mullion sections and transom sections in a complete factory-assembled unit) are manufactured off-site and hoisted into position floor by floor using cranes. Unitised systems offer faster installation (critical on high-rise projects where hoarding and crane time are expensive), more consistent quality control (factory assembly vs site conditions), and better airtightness performance. They cost approximately 25–40% more than comparable stick-built systems but deliver superior results on projects above 8–10 floors.
Which System is Right for Your Project?
The selection between curtain wall, structural glazing and their construction variants should be driven by three factors: architectural intent, building height/complexity, and budget.
For commercial buildings in Jaipur up to 6 storeys: Stick-built curtain wall is almost always the right choice. It delivers excellent performance, has the widest pool of experienced local fabricators (including Darsh Aluminium), and provides the best cost efficiency for this building scale.
For premium commercial, hotel or institutional projects 6+ storeys: Unitised curtain wall or structural glazing should be seriously evaluated. The installation speed advantage of unitised becomes significant above 6 floors; the aesthetic superiority of structural glazing justifies its premium for high-visibility projects.
For landmark or architectural projects where facade identity is critical: Structural glazing — potentially combined with point-fixed spider fittings for the most dramatic frameless effect — is the specified system. The cost premium (typically 40–60% over stick-built curtain wall) is justified by the architectural differentiation and market positioning benefit for commercial, hospitality and institutional clients.
A note on thermal performance: Rajasthan's climate demands attention to solar heat gain. Untreated clear float glass in a south or west-facing curtain wall will cause severe overheating and prohibitive air-conditioning loads. Specify low-e (low emissivity) coated glass, reflective glass or DGU units for any significant glazed facade in Jaipur. Thermally-broken aluminium profiles are also available and recommended for projects with high energy efficiency requirements.