The facade installation process is the sequenced construction of a building's external glass-and-aluminium envelope, carried out in eight stages: site survey and measurement, shop drawing approval, anchor and bracket fixing to the structure, aluminium framing (mullion and transom) erection, glass or panel glazing, structural sealing, weather sealing, and final performance testing. Each stage is governed by the National Building Code of India (NBC) 2016 and the relevant IS standards, and every stage must be completed and inspected in order because each layer depends on the alignment and integrity of the one beneath it. Whether you are commissioning a corporate tower on Hyderabad's Financial District IT corridor or a retail frontage in Secunderabad, this sequence stays the same.
A facade is far more than cladding. It manages wind load, water penetration, thermal transfer, acoustics and dead-load transfer back into the primary structure. Correct installation is what turns individual components, aluminium extrusions, toughened or laminated glass, gaskets, brackets and structural sealants, into a single weather-tight, structurally sound system. Our glass facade work and structural glazing teams manage this end to end, and the same discipline applies whether the system is a unitised curtain wall or a stick-built spider-glazed atrium.
In Hyderabad, Secunderabad and across Telangana and Andhra Pradesh, where summer temperatures reach 42-44 C and the monsoon drives rain almost horizontally against tall buildings, installation tolerances and sealing quality directly determine whether the facade leaks, whistles in the wind or thermally overloads the interior. This guide walks through each stage with the standards, tolerances, hardware and realistic INR figures you should expect, and explains where quality control makes or breaks long-term performance.
Stage 1-2: Site Survey, Measurement and Shop Drawings
The facade installation process begins with a physical site survey to record the as-built structure, because concrete frames commonly deviate 10-25 mm from their design position, and the facade must absorb this deviation through adjustable brackets rather than by cutting glass on site. This is the stage that quietly decides the quality of everything that follows.
- Laser or total-station survey captures column faces, slab edges and floor-to-floor heights to within +/- 2 mm.
- Shop (fabrication) drawings are prepared to 1:1 dimensional detail and approved by the architect and consultant before any aluminium is cut or any glass is ordered.
- Structural calculations verify the system against wind load per IS 875 Part 3 and dead load per IS 875 Part 1.
- Material specifications are fixed: aluminium alloy 6063-T6 for extrusions, glass thickness per IS 2553, and structural sealant grade per ASTM C1401.
- A sample or mock-up bay is often built and tested first on large projects, so any detailing problem is caught before mass fabrication.
Skipping an accurate survey is the single most common cause of downstream misalignment and water leakage. This is also the right moment to lock scope and to get a free quote so material lead times, typically 3-6 weeks for imported high-performance glass, are built into the programme rather than discovered mid-project.
Stage 3-4: Anchor Fixing and Aluminium Framing Erection
Brackets and anchors are fixed to the slab edge or structural steel first, forming the continuous load path that transfers the entire facade weight and wind pressure back into the building frame. Nothing else can proceed until this load path is verified.
- Anchor bolts (typically M12-M16 stainless or hot-dip galvanised) are chemically or mechanically fixed to the slab edge, with pull-out load tested on a sample set.
- Aluminium mullions (vertical members) are erected and levelled, then transoms (horizontals) are inserted between them to form the grid.
- Verticality is held within 2-3 mm plumb over a storey height and about 1.5 mm per 3 m horizontally.
- Expansion joints of 3-6 mm are provided at mullion splices to absorb thermal movement, as aluminium expands roughly 0.024 mm per metre per degree C, which over a 40 m facade in Hyderabad's temperature swing is a real, calculable distance.
- Erection typically runs floor by floor from a lower level upward using monorails, cradles or scaffolding.
Getting bracket alignment right here is non-negotiable, because a 5 mm error in the anchor line multiplies into a visible bow across a full facade bay, and once glass is loaded it cannot be corrected without dismantling. You can see how clean, plumb framing translates into finished elevations in our recent projects across the twin cities.
Unitised vs Stick-Built: Choosing the Right System
Before glazing begins, the project will have committed to one of two construction methods, and the choice shapes cost, speed and site risk. A stick-built (or stick) system assembles the mullions, transoms and glass piece by piece on site; a unitised system delivers factory-glazed, pre-sealed storey-height panels that are simply lifted and clicked onto the brackets.
- Stick-built suits low-rise and mid-rise buildings, smaller budgets and irregular geometry, but it is slower on site and more exposed to weather during construction.
- Unitised suits high-rise towers and tight programmes, installs far faster once panels arrive, and moves the critical sealing and curing work into a clean, quality-controlled factory.
- Unitised systems carry a higher upfront cost and longer factory lead time, and they demand near-perfect survey data because there is no on-site adjustment room.
For most commercial buildings up to around 12-15 storeys in Hyderabad and Secunderabad, a well-detailed stick-built curtain wall or structural glazing system delivers the best balance of cost and performance. Taller towers and marquee corporate campuses increasingly justify unitised construction for the speed and factory-grade seal quality it buys.
Stage 5: Glazing the Curtain Wall and Structural Glazing Systems
Glass is installed into the framed grid either as captured (pressure-plate) glazing or as structural silicone glazing (SSG) bonded directly to the frame, and the choice drives both the look and the maintenance profile. This is the stage where the building's character becomes visible.
- Captured systems mechanically clamp glass with pressure plates and gaskets, then cover them with snap-on aluminium caps for a gridded, articulated appearance.
- SSG bonds glass to aluminium using structural silicone with a minimum structural bite of 6 mm, designed to ASTM C1401, giving a flush, frameless external face.
- Facade glass is toughened to IS 2553 Part 1 (typically 6-12 mm) or laminated with a 0.76 mm PVB interlayer for safety, security and acoustic damping.
- Double-glazed units (DGUs) with a 12-16 mm air or argon gap achieve U-values of roughly 1.6-2.8 W/m2K, aiding Energy Conservation Building Code (ECBC) compliance in Telangana's hot climate.
- Low-E and high-SHGC-control coatings cut solar heat gain, which materially lowers air-conditioning load on west and south elevations in Andhra Pradesh's harsh afternoon sun.
Where the design calls for point-fixed or spider glazing, the fittings must match the glass thickness and drilled-hole tolerance exactly, or the glass will carry uneven stress. Matching glass specification to orientation and use is exactly the kind of detailing our glass facade work team resolves at drawing stage, not on the scaffold.
Stage 6: Structural Sealing and Silicone Cure
Structural sealing is the stage where structural silicone glazing joints are gunned, tooled and left to cure, and it cannot be rushed because the silicone is what transfers wind load from glass to frame. Patience here prevents catastrophic failure later.
- Structural silicone requires a controlled 7-14 day cure at stable temperature and humidity before the glass may carry design wind load.
- Two-sided and four-sided SSG configurations are chosen based on wind exposure and building height.
- Adhesion is verified with peel and butterfly tests on cured samples before sign-off.
- Joint dimensions (structural bite and glue-line thickness) are calculated from the glass size and design wind pressure, never guessed on site.
- Substrates must be solvent-cleaned and primed as the sealant manufacturer specifies, since a contaminated surface is the hidden cause of most bond failures.
For factory-glazed unitised facades this sealing and curing happens in a controlled plant, which is why unitised systems install faster on site than stick-built. Either way, sloppy structural sealing is the defect most likely to surface years later as glass movement or, in the worst case, panel detachment, so it is worth insisting on a documented QA record for every bay.
Stage 7: Weather Sealing, Gaskets and Rain-Screen Drainage
Weather sealing creates the final barrier against air and water using EPDM gaskets and weather-grade silicone applied to all perimeter and movement joints, sitting outboard of the structural seal. In a monsoon climate this stage is what keeps the interior dry.
- EPDM or neoprene gaskets seal the glass-to-frame interface and remain flexible for 20+ years in Hyderabad's UV and heat.
- Weather silicone is tooled into a concave profile for a continuous, fully adhered seal, not just a surface skin.
- Two-stage (pressure-equalised, rain-screen) drainage is used on high-performance systems so any penetrating water is channelled out through weep holes rather than trapped.
- Sealant joint width is designed at roughly twice the expected movement, commonly 6-12 mm wide.
In Telangana and Andhra Pradesh's monsoon, correctly tooled weather seals are what prevent wind-driven rain ingress under 100-150 km/h gust conditions. Openable vents and doors within the facade rely on quality hardware so that the moving parts seal as tightly as the fixed glazing around them; matching those components to the system is part of the scope covered under our services.
Stage 8: Testing, Inspection and Handover
The completed facade is performance-tested for water-tightness, air infiltration and structural integrity before handover, and this testing is what separates a certified installation from an unverified one. Insist on it in writing.
- Field water penetration is tested per ASTM E1105 (calibrated spray rack) or the AAMA 501.2 hose test on representative bays.
- Air infiltration and static/dynamic pressure tests confirm the design wind rating.
- Visual inspection checks alignment, sealant continuity, gasket seating and glass for scratches or edge damage that could seed future breakage.
- Documentation, warranties (commonly 10 years on sealant, 5-10 years on hardware) and a maintenance schedule are handed over.
A full mid-rise facade installation typically takes 8-20 weeks depending on area and complexity. Once handed over, ongoing performance depends on periodic re-sealing and hardware servicing, which keeps the envelope performing across its full 25-40 year life. If you are planning a build, it is worth having a facade contractor price and programme this properly from the start, get a free quote with your drawings and the testing regime will be scoped in from day one.
Facade Installation Cost in Hyderabad and Secunderabad (INR)
A professionally installed aluminium-and-glass facade in Hyderabad and Secunderabad costs roughly INR 1,200-3,500 per sq ft, and the spread is driven mostly by glass specification and system type rather than by labour.
- Captured (pressure-plate) curtain wall with single toughened glass: about INR 1,200-1,800 per sq ft.
- Structural glazing (SSG) with DGU and low-E coating: about INR 2,200-3,500 per sq ft.
- Spider / point-fixed glazing for atriums and entrances: about INR 2,500-4,500 per sq ft including fittings.
- ACP (aluminium composite panel) cladding as a lower-cost solid infill: about INR 350-750 per sq ft.
Height, access difficulty, glass origin (domestic vs imported), coating grade and hardware brand all move these numbers. Premium branded fittings and superior structural sealants add cost up front but sharply reduce leaks and re-work, which is where the real lifecycle savings sit. For an itemised estimate against your drawings, get a free quote and the framing, glass and hardware can be priced line by line rather than as a single vague rate.
Common Facade Installation Mistakes and How to Avoid Them
Most facade failures in the field trace back to a handful of avoidable installation errors, and knowing them lets you specify and supervise more effectively.
- Inaccurate survey leading to forced-fit panels and stressed glass, avoided by total-station measurement before fabrication.
- Loading structural silicone before the 7-14 day cure completes, which permanently weakens the bond.
- Omitting or blocking weep holes, trapping monsoon water inside the mullion cavity where it corrodes fixings and stains interiors.
- Mixing incompatible sealants and gaskets, causing chemical breakdown and staining within a few seasons.
- Using under-rated fittings on point-fixed glass, or the wrong glass thickness for the span, which shows up as bowing and eventual cracking.
- Treating handover testing as optional, so leaks are discovered by tenants instead of by a spray rack.
The safeguard against all of these is a single accountable contractor who owns survey, fabrication, installation and testing rather than splitting them across parties who blame each other. Our structural glazing and glass facade work teams work exactly that way across Hyderabad, Secunderabad and the wider Telangana and Andhra Pradesh region.
