How Curtain Wall Facades Are Installed in Riyadh Towers

A curtain wall carries no floor load. It hangs from the slab edges and takes its loads from wind, its own weight and the movement of the structure behind it. In Riyadh the demands are specific: dark glass reaching 70 degrees Celsius on a summer afternoon, fine dust that finds every open joint, and wind speeds that rise sharply with height on 150-metre towers.

Installation is the point where that design either becomes performance or becomes a permanent maintenance problem. The same aluminium profiles, the same double glazing and the same brackets can produce a watertight, thermally stable envelope or a facade that streaks and leaks within two seasons. What separates the two outcomes is the site sequence and the discipline behind it.

Work starts with a total station survey that sets the anchor line on each slab edge to plus or minus 5 mm. Anchors are fixed with torque-controlled bolts and recorded one by one. Vertical mullions are then plumbed to within 1.5 mm per storey, working outward from the reference corner, before transoms are connected and pressure plates prepared. Glass follows on setting blocks, captured by the pressure plates, gasketed, and finally sealed with backer rod and structural silicone applied inside the sealant manufacturer's temperature and humidity limits.

Every step is inspectable and should be signed off before another trade touches it. Once the pressure plate is torqued and the sealant has cured, a mullion that is out of plumb or a blocked drainage channel costs ten times more to correct at height than to install correctly the first time.

Above roughly ten storeys, unitized curtain wall is the default in Riyadh. Factory-glazed panels arrive complete, are hoisted to the working floor and hung on the structure through simple two-way brackets. Quality is controlled in the factory, where glazing, sealing and even the mock-up happen under cover, and a unitized crew can install 150 to 250 square metres per day per crane position.

Stick-built remains the right answer for mid-rise buildings, faceted or curved geometry, and sites with no crane access. Profiles are cut, assembled and glazed at height, so output drops to 50 to 80 square metres per day and quality rests heavily on the crew. Choose the system from the tower's height, geometry and programme, never from the supplier's margin.

Riyadh's wind climate is moderate compared with Jeddah or Dammam, but the exposure factor at tower height produces significant pressure and, more critically, suction at corners and parapets. Anchors are sized for calculated reactions under Saudi Building Code loading provisions, and pull-out tested on site. Connections must also allow movement: a three-metre aluminium mullion expands and contracts several millimetres between a winter night and a summer afternoon.

The slab-edge interface is part of the facade scope, not another trade's problem: fire-stopping between floors, mineral wool, vapour barrier and flashings. This is where thermal bridging and water ingress appear when installation is rushed, and it is the area worth inspecting most carefully on every site visit.

Two forces define facade performance in Riyadh: dust and solar heat. Dust storms load the gaskets and sealant joints, and if the drainage path in the glazing rebate is blocked, water and dust find their way inside. Specify EPDM gaskets rather than basic PVC compounds, open weeps that drain the rebate, and pressure-equalized joints that let the cavity breathe while keeping wind-driven rain out.

On the heat side, the thermal break in the frame must be continuous. A single bracket bridging it creates a cold internal surface and condensation, even in Riyadh's dry air, wherever air conditioning runs around the clock. None of these details are visible after handover, which is exactly why they are specified on paper and verified at the mock-up.

The Saudi Building Code requires curtain walls to demonstrate air infiltration, water penetration and structural wind-load performance, referenced to AAMA/WDMA and CWCT test methods, with energy performance tied to SBC 601. On serious projects a full-scale mock-up of the actual system and glass build-up is tested before production begins, so failures are found on the rig instead of on the tower.

Testing continues after installation. Water spray testing of sample areas to AAMA 503 confirms that site work matches the tested assembly, and it should be repeated on several floors, at corners and at roof and podium transitions. A contractor who produces those reports without being asked is telling you something about how the rest of the job will run.

Installation labour is typically 20 to 30 percent of the installed square-metre rate, and it is the line item where cheap bids cut corners. As a 2026 reference, stick-built curtain wall installed in Saudi Arabia with double glazing runs about 850 to 1,600 SAR per square metre, while unitized systems run 1,400 to 2,500 SAR per square metre.

Compare bids on an identical scope: supply and installation together, the same glass and coating, the same testing programme, and stated installation rates per day. A low rate with a slow crew and a separate installer is not cheaper; it is a longer programme with divided responsibility for every leak.

Four questions separate real facade companies in Riyadh from traders: do you fabricate in your own factory, do you install with in-house crews, can you show a test report for the exact system and glass proposed, and which towers in Riyadh can I visit? The answers decide whether the facade on the drawing becomes the facade on the building.

Ramz Al Badran manufactures curtain wall, structural glazing and spider systems at its aluminium factory in Riyadh and installs them with in-house crews across Saudi Arabia. Our engineers issue shop drawings, coordinate anchorage with the structure, supervise every stage and run the field test programme. Send us your tower elevations and areas and we will return a fixed price, a test programme and an installation schedule — and you are welcome to visit the factory and completed Riyadh towers first.