Facade BIM Coordination (Level 2)
Façade BIM coordination for Ghana — 3D façade modelling, clash detection against structure and M&E, fabrication-level coordination and LOD progression, managed within the ISO 19650 information framework to cut site rework on complex envelopes. Facade Ghana, since 1982.
Façade BIM coordination is the discipline of modelling the building envelope — the curtain wall, glazing, rainscreen and its supporting steel — in 3D, then checking that model against the structural and M&E models so every interface is resolved before anything is fabricated. On a complex elevation, the costly failures happen when a bracket fouls a beam or a fixing lands on a duct and it is only discovered on site, after the steel and panels are already cut. Facade Ghana has engineered building envelopes across Ghana since 1982, and our position is simple: the interfaces are resolved in the model first, so the workshop and the wall stay in agreement.
Why the Model Comes Before the Workshop
A façade is the one trade that has to land cleanly against everyone else’s — the frame, the floor slabs, the M&E risers, the embeds cast into concrete. Two-dimensional details hide the conflicts; a coordinated 3D model exposes them. Coordinating the envelope in BIM is not a presentation exercise or a fee line for its own sake — it is how you find the clash that would otherwise cost a re-fabricated bracket and a delayed programme. The decision to coordinate in BIM should be made against the building’s complexity, not against the lowest price.
Choosing the Level of Coordination
Project information requirements
Before modelling starts, we agree what the model must deliver — which elements, at what level of detail, against what programme — using the ISO 19650 information framework so naming, status and exchange are defined up front. This is the difference between a model that coordinates the work and a model that merely looks like the building.
Level of detail (LOD) progression
The model is progressed from a design-intent level to a fabrication-ready level, so brackets, cassettes and glazing units come off the model with their interfaces already resolved. We agree the LOD the project actually needs rather than over-modelling detail no one will use.
Federation with structure and M&E
The façade model is federated — overlaid — with the structural and M&E models so clashes are found across trades, not within the façade alone. A façade that is internally consistent but fouls a beam or a duct has not been coordinated; federation is what makes the check real.
Levels of Façade Coordination Compared
| Coordination level | What it delivers | Best for | Note |
|---|---|---|---|
| 2D detail | Coordinated interface drawings | Small, repetitive elevations | clashes resolved by detailer, not federated model |
| 3D façade model | Envelope modelled as a system | Geometrically varied façades | interfaces visible, not yet fabrication-ready |
| Clash-detected + federated | Façade checked vs structure/M&E | Complex multi-trade interfaces | conflicts found before fabrication |
| Fabrication-level (LOD progressed) | Workshop-ready coordinated model | Unitised / high-value envelopes | panels fabricated to fit first time |
(The right level depends on the façade’s complexity and the project’s information requirements; we advise on what the building actually needs rather than over-modelling.)
How We Coordinate a Façade in BIM
- Set the information requirements — elements, level of detail and programme agreed within the ISO 19650 framework before modelling starts.
- Build the 3D façade model — curtain wall, glazing, rainscreen and supporting steel modelled as one system.
- Run clash detection — façade model federated with structure and M&E; conflicts found and resolved on screen.
- Coordinate to fabrication level — model progressed to a fabrication-ready LOD so panels and brackets come off the model.
- Issue and hand over — coordinated drawings, interface details and the model issued for fabrication and handed over as-built.
Materials & Real Standards
- ISO 19650 — the international framework for managing project information using BIM; we use it as the management framework for how façade information is named, statused, exchanged and handed over (it is a way of organising the work, not a product certificate)
- ASTM E283 — air leakage of the assembled façade, verified on the built system once coordinated
- ASTM E331 — water penetration under static pressure
- ASTM E330 — structural performance of the façade under wind load
- EN 1090 — execution of structural aluminium and steel for the façade’s supporting framework (the elements the model coordinates against)
- Clash detection & LOD — the coordination process itself: federating models, finding conflicts before fabrication, and progressing the level of detail to workshop-ready
What Affects the Cost
- The complexity and geometry of the façade (a repetitive flat elevation models faster than a façade that changes across the building)
- The level of detail required (design-intent vs fabrication-ready LOD)
- The number of trades to federate against (structure alone, or structure plus full M&E)
- Whether the supporting steel and embeds are already modelled, or must be modelled to coordinate against
- The information requirements and exchange programme set for the project
Façade BIM coordination is quoted on survey — the geometry, the level of detail and the number of interfaces decide the fee, not a fixed rate that would not hold. The coordination effort is paid back in panels that fit first time and a programme that holds.
Applications Across Ghana
- Mixed-use and corporate towers in East Legon, Airport City and Ridge with complex multi-trade façades
- Institutional and healthcare buildings where the envelope must coordinate against heavy M&E
- Unitised curtain-wall projects fabricated off-site that must fit first time on install
- Hotels and high-occupancy buildings with varied, non-repetitive elevations
- Commercial and institutional commissions in Kumasi and Takoradi
Areas We Serve
Facade Ghana coordinates building envelopes in BIM across Greater Accra — Ridge, Airport City, Cantonments, the CBD, East Legon, Spintex and Tema — plus Kumasi and Takoradi.
Related Services
- Unitised Curtain Wall — off-site units that must fit first time
- Stick-Built Curtain Wall — site-assembled curtain-wall systems
- Structural Glazing — bonded glazing coordinated against structure
- Wind-Load & Pressure Testing — verifying the coordinated façade
- Façade Systems Compared — choosing the right envelope system
Frequently Asked Questions
What is façade BIM coordination? It is coordinating the building envelope — curtain wall, glazing, rainscreen and its supporting steel — in a shared 3D model, then checking that model against the structural and M&E models so interfaces are resolved before fabrication. The clash is found on screen and fixed in the model instead of on site.
Do I need BIM for a simple façade? Not always. A small, repetitive elevation can be coordinated on 2D detail. BIM earns its place on complex or high-value envelopes — varied geometry, tight interfaces, unitised panels that must fit first time. We advise honestly on which projects benefit.
What is ISO 19650 and do you work to it? ISO 19650 is the international framework for managing project information using BIM — how information is named, statused, exchanged and handed over. We use it as the management framework for façade information. It is a way of organising the work, not a product certificate.
How does BIM coordination reduce cost and rework? The expensive failures happen when a clash is found after steel and panels are fabricated. Resolving those interfaces in the model first removes that rework, so panels fit first time and the programme holds. The fee is quoted on survey against the façade complexity.