Structural glazing and curtain wall, Delhi NCR
Structural glazing is what gives you a flush glass face with no beading breaking it up: the glass is bonded to the aluminium behind it with structural silicone rather than clamped from outside. It looks simple from the road, and every part of it depends on getting the silicone joint and the water path right.
The systems we build
Which system suits you is decided by the building, not by preference: how the slab edges run, how much site access you have, what wind load the elevation sees, and whether the glass can be brought up in one piece or has to be glazed in place.
Semi-unitised glazing
Mullions and transoms are fixed to the structure on site, and the glass arrives already bonded into its aluminium sub-frame. It is the workhorse for Delhi office blocks: most of the silicone work happens in controlled conditions rather than on a swing stage in May.
- Glass
- DGU or single, reflective or heat-reflective
- Bonding
- Structural silicone, cured before it ships
- Best for
- Office blocks, showrooms, institutional
Curtain wall, stick system
A non-load-bearing skin hung off the slab edges. It carries its own weight and the wind load, nothing else. Mullions go up first, transoms between them, then the glass. More site labour than unitised, but far more forgiving where the structure is not perfectly true.
- Anchors
- MS brackets to slab, adjustable in three planes
- Movement
- Slotted connections for structural movement
- Best for
- Retrofit, irregular structures, phased sites
Spider glazing
Point-fixed glass on stainless spider fittings, with no framing across the face at all. It is the entrance and atrium answer: maximum transparency, and every hole in the glass drilled before toughening because you cannot drill it afterwards.
- Glass
- 12mm toughened minimum, holes pre-drilled
- Fittings
- SS 304 or 316 spiders and routels
- Best for
- Entrances, atriums, double-height lobbies
ACP and glass combination facades
Most commercial elevations in NCR are not all glass. Panel over the slab bands and the service risers, glass over the office floors. Running both trades ourselves means the panel line and the glass line actually meet, which is not always the case when they are two contracts.
- Interface
- Single setting-out for panel and glass
- Rate
- Quoted separately per area
- Best for
- Commercial buildings, mixed-use
For the panel areas of the same elevation see acp cladding and hpl cladding. Interior glass walls and cabin fronts are on glass partitions, and point-fixed entrance doors are on frameless glass doors.
The details that decide whether a facade leaks
The structural silicone joint
The bite, meaning how much silicone actually holds the glass, and the glue-line thickness are calculated from the wind load and the glass size. They are not a matter of running a bead until it looks full. Undersized bite is what fails four years later, and by then nobody remembers who did it.
Drainage, not sealing
A facade is not made watertight by sealing every joint. Water gets past the outer line eventually on every building. What keeps it out of the office is a drained and pressure-equalised cavity inside the mullion, with weep paths that take it back out. Block those and you have built a gutter with nowhere to go.
Movement and anchors
The building moves, the aluminium expands, and the glazing has to absorb both without loading the glass. Brackets are slotted and adjustable in three planes, and every fixed point is a deliberate decision rather than wherever the drill went.
Glass specification
Toughened or heat-strengthened, single or double glazed, reflective coating on which surface. On a west face in Delhi the coating choice changes the air-conditioning load for the life of the building, so it is worth thirty minutes at the survey rather than a guess on the BOQ.
What it costs
₹320 to ₹450 per sq ft, fitted
Supply and fitting, before GST. Single-glazed semi-unitised work on a straightforward elevation sits at the bottom. Double-glazed units, high-performance coatings, spider work and anything needing swing stages or cranage move it up. On tendered work, send us the BOQ and we will price it line by line.
Send sizes for a firm rate →What moves the number
GST extra. Scaffolding, swing stages and cranage are quoted as separate lines.
Facades we have glazed
Architects and builders: ask for a project list with areas and completion dates.
Survey and system selection
We look at the structure, the slab edges and the access before recommending a system. On tendered projects we price the BOQ as issued and flag anything in it that will not work on that elevation, in writing, before the order.
Fabrication and bonding
Mullions and transoms cut and machined at the workshop. On semi-unitised work the glass is bonded into its sub-frame and left to cure properly before it comes to site. Silicone cures on its own schedule and there is no way to hurry it.
Installation and testing
Brackets anchored and set out, framing erected and aligned, glass fixed and weather-sealed. Then we hose test the elevation before handover, because the time to find a water path is while our men are still on the scaffold.
Questions we get on every structural glazing & curtain wall job
What is the difference between structural glazing and a curtain wall?
A curtain wall is the whole system: a non-load-bearing aluminium and glass skin hung off the building structure, carrying only its own weight and the wind. Structural glazing describes how the glass is held in that system, bonded to the framing with structural silicone instead of clamped by external beads, which gives you a flush glass face. Most curtain walls we build are structurally glazed, so in practice the two words often describe the same elevation.
What does structural glazing cost per sq ft in Delhi NCR?
Between ₹320 and ₹450 per sq ft for supply and fitting, before GST. Single-glazed semi-unitised work on a straightforward elevation is at the bottom of that band; double-glazed units, high-performance coatings and spider glazing push it to the top. Access equipment is quoted separately because it depends entirely on the site.
Which system is right for my building?
Semi-unitised suits most Delhi office blocks: the silicone bonding happens at the workshop rather than on a swing stage. A stick-built curtain wall is more forgiving where the structure is irregular or the site is phased. Spider glazing is for entrances and atriums where you want no framing across the glass at all. We recommend after the survey, not before it.
How do you stop a glazed facade from leaking?
By draining it rather than trying to seal it perfectly. Water will get past the outer silicone line on any building eventually. The mullion carries a drained, pressure-equalised cavity with weep paths that take that water back outside. We hose test the elevation before handover so any blocked path is found while the access is still up.
Do you work from architect drawings and BOQs?
Yes, that is most of our commercial work. Send the drawings and the BOQ and we price it line by line. If something in the specification will not perform on that elevation, you will hear it from us in writing before the order, not as a variation halfway through.
Which areas do you cover for glazing projects?
All of Delhi NCR, with most commercial glazing work in Gurugram, Noida, Greater Noida and Delhi. The workshop is off Dilshad Garden in East Delhi.
Project enquiry
Send the drawings. We will price against them.
Elevation drawings or a BOQ are ideal. A photograph of the structure and an approximate glazed area is enough to start a conversation. Site survey is free anywhere in NCR.