Coordination Between Facade and Structure: Common Clashes
Most facade coordination problems come down to the same thing: the structure is not where the drawings say it is, and nobody checked before manufacturing started. Concrete tolerances and facade tolerances operate on different scales, services get routed through the facade zone, and movement joints do not line up. These are predictable issues with known solutions - but they still account for significant rework costs on Australian projects.
A concrete slab edge might be built to a tolerance of plus or minus 20mm. The finished cladding plane needs to be within plus or minus 3mm. That 17mm gap has to be absorbed somewhere, and the facade subframe is the component that does it.
Why do structural tolerances and facade tolerances clash?
Concrete construction tolerances under AS 3600 allow for meaningful deviation from the design position. A slab edge can be 20mm out of plane. A column face can be 15mm off its set-out. Across a full elevation, cumulative deviations create an uneven substrate that the facade must sit flat against.
For rainscreen cladding like interloQ or element13, the finished face tolerance is typically 3mm over any 3-metre span. For 165CW curtain wall, it is tighter again because glazing and sealing depend on frame alignment.
The subframe absorbs the difference. For rainscreen systems, each bracket provides three-axis adjustment - in/out, left/right, up/down - sized to accommodate the expected structural variance. For 165CW, a 3-part structural bracket with three-dimensional installation adjustment does the same job, allowing fine positioning of each unitised panel after the structure is complete.
Where do embedded plates and cast-in items go wrong?
On projects where the facade fixes to cast-in plates or channels, location accuracy is critical. If a plate is 30mm off position - well within what happens during a concrete pour - the bracket may not reach it, or the fixing geometry changes enough to compromise load capacity.
The failure is usually procedural. The structural engineer details cast-in items from the architectural set-out. The facade designer refines fixing positions based on panel layout and joints. If those two processes happen independently, the cast-in items end up misaligned with the final facade design. The fix: confirm facade fixing locations with the subcontractor before structural shop drawings are finalised.
What happens when services penetrate the facade zone?
Mechanical, hydraulic, and electrical services regularly end up in the facade zone. Condenser pipes, exhaust ducts, overflows, and conduits all need to pass through the external wall.
Every penetration interrupts the insulation layer, weather barrier, and potentially the cladding support structure. A 150mm exhaust duct punched through after the subframe is installed means reworking brackets, cutting insulation, and detailing a weatherproof seal around something that was not in the facade design. Early identification of all penetrations - with sizes, locations, and clearances - lets the facade designer plan around them. Late ones cost real money.
Why do movement joints misalign?
Buildings move. Concrete structures experience creep, shrinkage, and thermal movement. Structural engineers place movement joints at calculated intervals. The facade also moves - aluminium has a thermal expansion coefficient of 23 microns per metre per degree Kelvin, so a 6-metre span can move plus or minus 2-3mm through normal daily temperature cycles.
The problem arises when structural movement joints and facade joints are not coordinated. A structural expansion joint at a slab edge needs a corresponding joint in the facade. If the facade joint pattern - driven by panel sizes and aesthetic intent - does not align, the facade either bridges a structural joint (creating stress concentrations) or requires awkward detailing that compromises weatherproofing. Coordinating these early, when panel layouts are still flexible, avoids expensive site modifications.
What practical steps prevent these clashes?
Survey the structure before manufacturing. A point cloud or traditional survey after the frame is complete - but before facade manufacturing starts - identifies every deviation and allows the subframe to accommodate it. Never assume as-designed dimensions match as-built.
Coordinate facade fixings with structural design. Lock cast-in plate and bracket positions before the structure is poured. This requires the facade subcontractor to be engaged early enough to provide input.
Map all penetrations at design stage. Every discipline that puts something through the external wall needs to register it on a coordinated facade elevation, so the facade designer plans around known penetrations rather than reacting on site.
Align movement joints. Overlay the structural movement joint layout with the facade panel layout early in design. Resolve conflicts on paper, not on the scaffold.
Build adjustment into the bracket system. Specify brackets with enough range to absorb the full structural tolerance plus a margin. For most concrete structures, that means at least 25mm of adjustment in the primary axis.
How does Valmond & Gibson support facade coordination?
V&G provides interface details, bracket specifications, and adjustment range data for interloQ, element13, 165CW, and conneQt. This supports facade engineers and installers in designing the subframe for each project’s specific structural conditions.
The coordination itself sits with the design team and the facade subcontractor - V&G does not perform structural design or facade engineering. What V&G does provide is accurate system data so that the people doing the coordination have what they need.
Most facade-to-structure clashes are not technically difficult to solve. They are difficult to solve cheaply after the fact. Early coordination is the difference.
Related Reading
- Managing Facade Tolerances on Construction Projects
- Subframe Design for Aluminium Rainscreen Cladding
- Thermal Expansion in Aluminium Facades: A Design Guide
- Scaffolding Considerations for Facade Installation
Last updated: 4 April 2026