Our planning guide covers the full project sequence from first enquiry to handover. This article zooms into one specific part of that sequence — what actually happens physically, from the site survey through to the finished, tensioned structure — for anyone who wants to understand what’s really going on during installation, not just the high-level stages.
What this article covers, and what it doesn’t
This is an owner/buyer-level explanation of what happens during installation — enough to understand the process, ask informed questions, and know what to have ready. It isn’t a construction manual, and it doesn’t replace the actual engineering, safety planning or site-specific method statement a real installation crew works from. Erection and tensioning specifically are skilled, supervised work with real safety requirements — not something to attempt without a qualified team.
The installation sequence
| Stage | What happens | What the owner should have ready | Common delay/risk |
|---|---|---|---|
| Site survey | Real measurements, soil check, access assessment | Site access for the survey visit | Skipping this and designing from photos alone |
| Design/engineering coordination | Form, material, structural design finalised | Sign-off on the design and material spec | Late design changes after fabrication has started |
| Foundation/anchor readiness | Foundation built and cured to the engineered spec | Foundation work completed and cured before delivery | Foundation not ready when fabricated components arrive |
| Fabrication | Steel cut/welded/finished; membrane patterned and welded | Nothing – happens off-site | Design changes requested after fabrication begins |
| Transport/logistics | Components moved to site | Confirmed site access for delivery vehicles | Undiscovered access constraints (narrow roads, height limits) |
| Site setup | Site prepared, materials staged, safety measures in place | Site cleared and genuinely accessible | Site not cleared or still occupied by other work |
| Steel erection | Frame/columns erected to design position | Nothing further – crew-led | Undiscovered underground services or obstructions |
| Membrane positioning | Fabric lifted and positioned onto the frame | Suitable weather window | High wind delaying this specific stage |
| Tensioning | Membrane tensioned to its engineered design shape | Nothing further – specialist crew work | Rushing this step to hit a deadline |
| Drainage/alignment checks | Fall, drainage and overall alignment verified | Nothing further | Skipped under time pressure |
| Finishing | Accessories, edge details, final fixings completed | Nothing further | Left incomplete if schedule slips |
| Inspection/handover | Full structure checked; walkthrough with owner | Availability for the handover walkthrough | Skipped, leaving maintenance guidance unclear |
Between the survey and fabrication starting, design and engineering coordination turns the survey’s real measurements into a confirmed, buildable design – form, material, structural sizing and foundation requirements all get locked here, with sign-off from the owner before anything is fabricated. This stage is worth genuinely engaging with rather than rushing through, since a change requested after fabrication has started is one of the more common, avoidable sources of delay and added cost on any project.
Site survey: the foundation of everything that follows
A genuine site survey verifies what rough dimensions and photographs can’t: real soil conditions at the actual footing locations, access routes for materials and any equipment, and any underground or overhead services that need to be identified before work starts. Every later stage — design, fabrication, foundation — depends on this being accurate, which is exactly why it happens first and isn’t something a serious project skips to save time.
Foundation readiness before fabricated components arrive
The foundation needs to be complete and properly cured before installation begins — covered in more depth in our foundation and site preparation guide. Fabricated steel is built to exact measurements against the finalised design, so a foundation that isn’t ready, or that shifted from the design after fabrication started, creates a genuine, costly mismatch rather than a minor inconvenience.
Fabrication happens off-site, in parallel
While foundation work happens on site, steel components and membrane panels are typically being fabricated elsewhere — steel cut, welded and finished to the engineered design; fabric patterned and welded into the panels that will become the finished membrane. A team that handles design, fabrication and installation together (rather than passing the project between separate contractors for each stage) tends to carry measurements and decisions through more consistently between these parallel-running stages.
Transport and site access
Getting fabricated steel and membrane panels from the workshop to site isn’t always trivial — narrow approach roads, height restrictions, or no crane access can genuinely complicate delivery on some sites. This is worth confirming during planning, not discovered on delivery day; a site that seemed straightforward on paper can turn out to need a different delivery approach once actually assessed.
Erection: frame first, then membrane
The steel frame — columns, primary members, cable or rigging system — goes up first, set to its exact design position before the membrane is introduced at all. This is skilled, supervised structural work, with real safety requirements around lifting, working at height, and equipment operation that a genuine installation crew follows as standard practice, not an area where shortcuts are reasonable.
Membrane positioning and tensioning
Once the frame is in place, the fabric is lifted into position and tensioned to the shape the design calculated — correct, even tension is what makes the difference between a roof that sheds water and holds its shape in wind, and one that ponds, flaps, or stresses unevenly at the seams. This step is genuinely weather-dependent; high wind specifically can delay membrane positioning regardless of how well everything else is on schedule, which is a real, reasonable reason a timeline might shift.
Weather considerations during installation
Beyond wind affecting membrane positioning specifically, heavy rain can pause outdoor work generally, and installation scheduling around India’s monsoon season (covered in more depth in our monsoon guide) is a genuine, sensible planning consideration for projects timed near that period, rather than something to push through regardless.
Inspection and handover
Once installed, the structure gets checked — tension levels, anchoring, drainage fall, overall finish — before a walkthrough with the owner covering the day-to-day care the structure needs, the same routine covered in full in our maintenance and inspection guide. This handover conversation is worth attending directly rather than delegated entirely to site staff, since it’s where genuine, structure-specific maintenance guidance gets communicated.
Utilities, obstructions and equipment access
Underground and overhead services – power lines, water pipes, existing drainage runs – need to be identified before excavation starts, ideally during the initial site survey rather than discovered mid-dig; this is both a genuine safety issue and a scheduling one. Equipment access is worth thinking through in the same way: cranes and lifting equipment need a real, physically confirmed path and working area, not just enough clearance on a site plan. On a constrained or already-occupied site specifically, confirming this early – rather than assuming standard equipment will simply fit – avoids a genuinely disruptive discovery on installation day itself.
Pre-installation checklist
Before installation day, confirm:
- Foundation complete, cured, and matching the fabricated design
- Site genuinely clear and accessible for materials and equipment
- Underground/overhead services identified and marked
- Any last-minute site changes communicated ahead of time
- Availability for the final handover walkthrough
FAQ
How long does installation actually take?
This varies genuinely by project size, design complexity and site conditions – deliberately not stated as a fixed number here. A realistic schedule is worked through once your specific project’s design and site details are known.
Does every project follow this exact sequence?
The broad stages are consistent, but the specific order and overlap between them can vary by project – a small canopy and a large, complex structure don’t necessarily move through every stage identically.
Can installation happen in the rain?
Heavy rain and high wind specifically can pause certain stages, membrane positioning and tensioning especially – this is a genuine, reasonable scheduling consideration, not something pushed through regardless of conditions.
What’s the biggest cause of installation delay?
Foundation not being ready when fabricated components arrive, and site access issues discovered late rather than planned for in advance, are two of the more common, genuinely avoidable causes.
Do I need to be present for the whole installation?
Not for every stage, but the final handover walkthrough is worth attending directly, since it’s where structure-specific maintenance guidance actually gets communicated.
For the full project sequence including the stages before installation, see Planning a Tensile Structure Project: A Step-by-Step Guide. For what affects the price, What Determines the Cost of a Tensile Structure in India, and for how your specific site is prepared beforehand, our foundation and site preparation guide.
