When you review facade shop drawings, your job is to verify that the fabricator has correctly translated your design intent and performance specification into a buildable, code-compliant system - not to redesign it. The shop drawing is the fabricator's proposal for exactly how the curtain wall or structural glazing will be cut, assembled, sealed and anchored, and your review is the last practical checkpoint before aluminium is extruded and glass is toughened.
The discipline for architects is to check against a fixed list every time: performance data, structural adequacy, glass make-up, interfaces, tolerances and drawing completeness. A missing thermal break, a mislabelled glass coating, or an unresolved slab-edge interface is far cheaper to catch on paper than on a scaffold in Gachibowli or Kokapet. A single re-toughened glass panel or re-cut unitised frame can cost 8,000 to 40,000 INR and weeks of programme slip once fabrication has started.
The checklist below is structured the way an experienced facade reviewer works through a submittal in Hyderabad's warm, high-solar climate - starting with the paperwork, ending with a decisive, logged return. Use it on every package, whether the system is a stick-built curtain wall on a boutique office or a unitised facade on a high-rise in the Financial District.
What are facade shop drawings, and why does the review matter?
Facade shop drawings are the fabricator's detailed, dimensioned translation of your tender documents into a system that can actually be cut, machined, glazed and installed. Where your architectural drawings say what the facade must do, shop drawings say exactly how it will be built - every profile section, every gasket, every anchor and every interface, drawn to real tolerances.
The review matters because it is the last cheap moment to influence the facade. Once the package is approved and released, the fabricator orders extrusions, tempers glass and books the erection crew. An error found on paper is a red-pen comment; the same error found on site in Hitec City is a crane, a re-glaze and a delay to the whole envelope programme.
Reviewing well also protects your liability. A documented, checklist-driven review shows you confirmed compliance against the specification, while the approval stamp language keeps responsibility for dimensions and quantities with the fabricator where it belongs. If you want to see how a coordinated submittal looks in practice, our completed projects show the drawing-to-install sequence across Hyderabad and Telangana.
Start with the paperwork, not the details
Before you look at a single joint, confirm the submittal is complete and traceable. An incomplete package is grounds to return it unreviewed - reviewing half a set wastes your time and gives the fabricator false comfort.
- Title block, revision number, date and a clear reference to the tender drawing and specification it responds to.
- A drawing register listing every sheet - general arrangement, typical vertical and horizontal sections, jamb/head/sill details, corners, and interfaces.
- A material schedule stating aluminium alloy and temper (commonly 6063-T6), profile system, glass make-up, gasket and sealant grades.
- A stamped structural calculation package and, where required, a NABL-accredited test report or third-party wind-load basis.
- Design-assist projects should also carry a deviation log flagging any departure from your specified system.
If any of these are missing, return the package with a one-line note stating what is required for review to begin. This single discipline prevents most of the back-and-forth that drags out an approval cycle.
How do you verify performance against the specification?
Confirm that every quoted performance figure matches your tender basis, not a value the fabricator has quietly substituted. For Hyderabad's high solar gain and long summers, glass thermal performance is the number that most affects operating cost and occupant comfort.
- Glass thermal and optical values: U-value, SHGC and VLT for each vision and spandrel type, cross-checked against ECBC and any IGBC, GRIHA or LEED credit you are targeting.
- Air infiltration, water penetration and structural wind resistance ratings, referenced to ASTM E283, E331 and E330 (or the equivalent stated in your spec).
- Acoustic performance (Rw or STC) where the brief demands it - relevant on the ORR and near Rajiv Gandhi International Airport flight paths - with the tested glass make-up shown, not just a target.
- Thermal break presence and width in framing where a system U-value is specified - a polyamide thermal break is not optional if you have committed to an envelope value.
A double-glazed DGU facade with a high-performance low-E coating will typically be quoted at a lower SHGC than a monolithic reflective unit; make sure the make-up drawn actually delivers the value in the schedule rather than a nearby product the supplier had in stock.
How do you interrogate the structural basis?
Never approve member sizes without a stamped calculation you can follow. The structural check is where reviewing facade shop drawings protects both safety and your liability, and it is the section most often submitted incomplete.
- Wind pressure derivation traceable to IS 875 Part 3 with the correct basic wind speed, terrain category, building height and topography factor for the actual site - a tower in the Financial District sees different pressures from a low podium in Kondapur.
- Mullion and transom deflection limited to the specified criterion - commonly L/175 or 19 mm (whichever is less) for framing supporting glass.
- Glass thickness and structural silicone bite verified against the design wind load and pane size; toughened or heat-strengthened selection stated per IS 2553.
- Bracket, anchor and embed design with edge distances, fixing type and RCC/steel capacity confirmed; anchors are the most common weak link in the entire load path.
- Provision for thermal movement, live-load slab deflection and inter-storey drift at every stack joint.
If the project uses a specialised system such as spider glazing or a cable-net facade, the calculation must also cover fitting rotation, cable pre-tension and support deflection, which behave very differently from a framed curtain wall.
Checking glass, gaskets and sealants in detail
Glass and its seals decide whether the facade performs and lasts. Read the make-up call-out on every glass type and confirm it is internally consistent - the schedule, the section and the material list must all say the same thing.
- IGU composition: outer lite, cavity width and gas fill, spacer type (warm-edge preferred) and inner lite, with the low-E coating on the correct surface (typically #2 for hot climates).
- Toughened glass to be heat-soak tested where specified, to reduce nickel-sulphide spontaneous breakage risk - a real concern on large structural glazing elevations exposed to Hyderabad's heat cycling.
- Structural silicone and weather sealant makes named, with adhesion and compatibility confirmed against the substrate and gaskets.
- EPDM gaskets, setting blocks and edge clearances shown at glazing pockets; drained and pressure-equalised details where the system relies on them.
- Spandrel and shadow-box ventilation and back-pan detailing to manage heat build-up under direct sun, which can otherwise thermally stress the spandrel lite.
Check that the sealant service life and warranty match the project expectation. A weather seal that needs replacement in eight years on a 20-storey tower is a maintenance liability you should flag now, not discover at handover.
Why do interfaces and tolerances deserve the closest reading?
Most facade failures begin where the facade meets something else. Interfaces and tolerances deserve the closest reading in the whole set because water, movement and air leakage almost always find the junction, not the field of the wall.
- Slab-edge and RCC interface with the waterproofing membrane lap, flashing and how the facade dead load and wind load transfer into structure.
- Head, sill and jamb interfaces with masonry, RCC and adjacent systems, showing continuity of the air and water barrier.
- Movement and expansion joints sized for thermal and structural movement, not just drawn as a nominal gap - Hyderabad's day-night and summer-monsoon temperature swing drives real aluminium expansion.
- Stated fabrication and erection tolerances, and confirmation the design accommodates realistic RCC construction tolerances rather than ideal ones; a 25 mm slab-edge deviation is common on site and the facade brackets must absorb it.
- Fire-stopping and perimeter smoke seals at slab edges per NBC 2016 where the building height requires them.
Where the facade abuts other trades - ACP cladding, canopies or louvres - confirm the drawings show who owns the joint and how the two systems keep water out together, not each assuming the other seals it.
Reviewing shop drawings for Hyderabad's climate
A facade that reviews well on paper can still underperform if the drawings ignore local conditions. Hyderabad combines intense solar radiation for much of the year, a concentrated monsoon, and airborne dust that clogs drainage paths and abrades seals.
- Solar control: confirm the SHGC is low enough for west and south elevations in Gachibowli, Madhapur and Kokapet, where afternoon gain drives cooling load. A reflective or high-performance coated facade may be justified where a clear DGU is not enough.
- Monsoon water management: pressure-equalised, drained glazing pockets and generous, unobstructed weep paths matter more here than in a dry climate; check the drainage is drawn, not assumed.
- Dust and cleaning: verify seal profiles and drainage slots will not silt up, and that the elevation can actually be accessed and cleaned - a facade you cannot clean will look aged within a monsoon or two.
- Thermal cycling: with surface temperatures swinging widely between a monsoon morning and a peak summer afternoon, expansion provision and glass edge quality both matter for durability.
If you are unsure whether the submitted system suits the exposure, an independent facade consultancy review before approval is cheaper than a remedial re-glaze later. You can also get a free quote and drawing review from our team for projects across Hyderabad, Secunderabad and Andhra Pradesh.
Mark up, log and return decisively
Close the loop with a clear, defensible response so the fabricator knows exactly what to build. Ambiguous approvals cause the very errors they were meant to prevent.
- Use unambiguous stamps: 'Approved', 'Approved as Noted', or 'Revise and Resubmit' - avoid vague 'noted' language that no one can act on.
- Keep a numbered comment log tied to sheet and detail references, retained for the project record and any future dispute.
- State clearly that approval does not relieve the fabricator of responsibility for dimensions, quantities and compliance.
- Require a resubmittal for any 'Revise and Resubmit' sheet before release to fabrication - never let a partial approval slip into production.
Hakimi Aluminium and Glass offers design-assist, shop drawings, fabrication and installation for architects across Hyderabad, Telangana and Andhra Pradesh, which can shorten this review cycle when the drawing set and calculations arrive coordinated. If your project is still at concept, our note on choosing between stick and unitised systems will help you set the specification the shop drawings must later prove.
