Two facades can look identical on the day of handover. Ten monsoons later, one is dry and silent and the other has a facilities team chasing leaks with sealant guns. The difference was almost never the glass. It was decided years earlier, in two unglamorous rituals: the mock-up and the test chamber.
The mock-up: settle every argument on one panel
A mock-up is a full-size sample of a facade element, built exactly as production panels will be. On our projects, one mock-up is made for every unique element, and its drawings are approved by the facade consultant, architect, client and PMC before mass fabrication. The finish debates, the sightline debates, the "is this what we drew?" debates — all of them happen against one physical panel, while changing course still costs almost nothing.
The chamber: make the wall fail on purpose
Performance testing puts a real, full-size assembly of the facade into a test chamber and attacks it the way weather will:
- Air infiltration — the chamber is pressurised and leakage through the assembly is measured against the specified limit.
- Static water penetration — water is sprayed at calibrated rates while pressure differentials simulate wind-driven rain.
- Dynamic water penetration — an aircraft-engine fan drives water at the wall in gusts, the closest a lab gets to a cyclone squall.
- Structural performance — the wall is loaded to design wind pressure and beyond, with deflections measured at the mullions.
Here is the part that surprises people: things go wrong in the chamber. A gasket weeps at a corner; a drainage slot proves undersized. That is not the test failing — that is the test working. Every weakness found in the chamber is a weakness that never reaches the building. Be wary of any facade that has never been made to fail at anything.
What this means for a client
When comparing facade bids, the cheapest number often becomes cheap by quietly deleting exactly these stages. Three questions expose it: Will there be a mock-up for every unique element? Will the system be chamber-tested, and to which standard? And who signs the test report? The answers cost little to give and everything to fake.
Our own answers are on the testing page, and in 3,10,000 sq ft of chamber-tested facade on a single project. If you would like to watch a test — or see the mock-up yard — a factory visit is always welcome.
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