What Does Window Wall Design Coordination Involve?

Last Updated: November 4, 2026

Table of Contents

• Start Window Wall Design Coordination Before Drawings Begin
• What Window Wall Shop Drawings Must Capture
• Resolving Window Wall Interface Details Early
• Building a Facade Coordination Checklist That Works
  • Tolerances, Movement Joints and Structural Interfaces
• Running a Shop Drawing Review Process That Catches Problems
• Coordinating Window Wall Design With Structure and Services
  • Running a clash review that actually resolves clashes
  • Interfaces that repay early attention
• Performance Targets, Compliance and Measurable Checks
  • Turning NCC requirements into window schedule entries
  • A measurable-check workflow
• Common Window Wall Design Coordination Mistakes to Avoid
• Frequently Asked Questions

Start Window Wall Design Coordination Before Drawings Begin

Window wall design coordination aligns the window wall's setout, interfaces, tolerances and performance targets with every other trade before fabrication drawings are issued. Drawings are often treated as a downstream admin task. That is where the trouble starts.

Most facade problems we review trace back to an early choice that was never written down. Lock in these first:

• Confirm the structural grid and slab edge positions, including any setdowns
• Agree the finished floor levels and the datum everything references
• Fix the wall line: is the window wall flush, recessed or expressed?

What Window Wall Shop Drawings Must Capture

Window wall shop drawings must show the exact setout, member sizes, glazing build-up, fixing details and interface conditions for fabrication and installation, translating the architect's intent into something a fabricator can build.

A complete set covers more than an elevation:

1. Setting-out plans with gridlines and dimensions to structural references
2. Sub sill and subhead setout drawings
3. Vertical and horizontal sections through every condition
4. Head, sill and jamb details at each wall type
5. Glazing schedules with glass type, thickness and performance data
6. Fabrication drawings for each frame type
7. Interface details with slab, cladding and roofing

What most guides miss is the schedule. A drawing set without a coordinated window schedule is only half a set. The schedule ties every opening to a type, a level and a performance requirement.

You can see how each of these sheets should look in these facade shop drawing examples and what each sheet shows. For the actual service that produces setout and fabrication drawings, see our facade and window shop drawings.

Resolving Window Wall Interface Details Early

Window wall interface details define how the window wall meets slab edges, columns, ceilings, cladding and roof.

The interfaces that cause the most rework:

• Head details where the window wall meets slab soffits and ceiling lines
• Sill details at floor level, especially where finishes vary room to room
• Jamb details against columns, return walls and adjoining cladding

A common mistake is leaving these to the shop drawing stage. By then, the structural design is fixed and the builder has priced the job.

Get the interfaces onto a coordination drawing with the structural engineer and builder in the room. Agree them once, in writing.

Building a Facade Coordination Checklist That Works

A facade coordination checklist works when it names who checks what, and by when. Generic lists nobody signs off on do nothing.

Use this as a starting structure:

• Structural grid and slab edge dimensions verified against the architectural set
• Datum and finished floor levels confirmed
• Wall line and setout agreed with the architect

For a ready-made version, use our glazing shop drawing compliance checklist to structure your own review.

Tolerances, Movement Joints and Structural Interfaces

Tolerances and movement joints are where facade coordination quietly fails. The structure does not land perfectly, and the window wall must absorb that reality.

Three things to nail down:

• Construction tolerances. State what the structure will actually deliver, not what the drawings hope for. Then design the window wall to suit.
• Movement joints. Locate them, size them and show them on the drawings. Slab deflection, thermal movement and seismic drift all need somewhere to go.
• Structural interfaces. Show how the window wall fixes back to the slab, how anchors work and who supplies them.

Running a Shop Drawing Review Process That Catches Problems

A shop drawing review process catches problems when it has fixed checkpoints, named reviewers and a closed loop for every comment.

Run it in stages:

1. Pre-submittal check. The drafter self-checks against the checklist.
2. Internal technical review. A second set of eyes on setout, details and schedules.
3. Consultant review. Architect, engineer and builder review together.
4. Comment register. Every comment logged, assigned and closed.
5. Re-submittal. Revised drawings checked against the register.

The goal is fewer RFIs, not faster sign-off. A drawing approved quickly but raising ten RFIs on site has failed.

If RFIs are already a pattern on your projects, our guide on how to avoid RFIs in facade construction covers the tactics that work.

Coordinating Window Wall Design With Structure and Services

Window wall design coordination fails when structure and services are treated as someone else's problem. The window wall sits between both, and the clashes are predictable enough to design out before fabrication.

SUBMIT →

Structural coordination means confirming:

• Slab edge positions and any setdowns, including the actual as-built tolerance the structure will deliver
• Deflection limits that affect glazing and seals, and whether the window wall is designed to follow or isolate from slab movement
• Anchor types, embedment and who supplies them, cast-in versus post-fixed changes the slab edge detail and the programme

Services coordination means checking:

• Ceiling voids and how they meet the window head, including the depth needed for the head detail, blind pocket and any bulkhead
• Condensate drainage and where it goes, including fall and discharge points that cannot be hidden behind the window wall
• Electrical and data penetrations through the window wall, and whether they are permitted in the system or must be relocated

A common mistake is discovering a ceiling void is too shallow for the head detail after the frames are fabricated. That is a coordination failure, not a fabrication one.

Running a clash review that actually resolves clashes

A clash review is only useful if it produces decisions, not a list. The workable sequence is:

1. Overlay the models. Bring the architectural, structural and services models together at the window wall line, and mark every location where a beam, duct, pipe or cable tray comes within the window wall zone.
2. Set a zone of influence. Define the depth either side of the window wall that belongs to the coordination review, typically the head, sill and jamb zones plus the ceiling void immediately inside.
3. Resolve by priority. Structure generally wins over services, and services generally win over finishes, but the window wall's weatherproofing and movement joints must not be compromised to accommodate either. Record the decision and the trade that moves.
4. Draw the resolution. A clash closed in a meeting but not drawn will reopen on site. Each resolution needs a section or detail that shows the final condition.
5. Confirm ownership. Name who supplies, who installs and who inspects each interface, including anchors, fire seals and condensate connections.

Interfaces that repay early attention

• Slab edge and setdown. A setdown too shallow for the sub sill forces the window wall out or the ceiling down. Confirm the setdown dimension against the sub sill and head detail before the slab is poured.
• Deflection. Slab deflection under live load can crack glazing and open seals if the window wall is rigidly fixed at both head and sill. Decide the fixing strategy, typically fixed at one edge and sliding at the other, and show it.
• Blind pockets and head details. A blind pocket reduces the available head depth. Coordinate the pocket, the head flashing and the ceiling line as one detail.

Watch out: if the structural and services models are not overlaid until shop drawing stage, resolutions become variations and the window wall programme absorbs the delay.

Performance Targets, Compliance and Measurable Checks

Performance targets must be measurable requirements, not adjectives. "Good thermal performance" is not a target; a stated U-value and SHGC is. The coordination job is to make every target traceable from the specification to a test, calculation or certificate before fabrication.

Set targets for:

• Wind load resistance, based on the site, terrain category and building height
• Water penetration resistance
• Air infiltration

Then attach evidence to each one. A target without a verification method is a wish. The useful pattern is a single performance schedule, keyed to the window types on the elevations, recording four things per opening: the required value, the source of the requirement, the evidence that proves it, and who signs it off.

Turning NCC requirements into window schedule entries

The National Construction Code is the baseline, not the ceiling. Check the current edition of the NCC and the referenced standards with the Australian Building Codes Board for the requirements that apply to your project. Your coordination task is to translate those requirements into entries a fabricator can build to:

• Structural sufficiency. Wind actions must be determined under the applicable wind loading standard, and the window wall must be designed for the resulting pressures at each level and corner zone. Record the design pressure per window type, not a single building-wide figure.
• Weatherproofing. Water penetration and air infiltration resistance are typically demonstrated against the applicable Australian test methods, or by an accredited laboratory report for the specific system. Note the test standard and the achieved performance level against each type.
• Energy efficiency. Thermal performance is expressed through the glazing and frame combination, with U-value and SHGC declared under the relevant window rating scheme. The window schedule must match the values assumed in the energy model.

Watch out: the most common failure is a window schedule that states a system name but not the tested performance level, so the builder prices a system that cannot meet the energy model's assumptions.

A measurable-check workflow

Run the checks in this order so problems surface while changes are still cheap:

1. Requirement capture. Extract every performance requirement from the specification, energy report, acoustic report and NCC pathway into one register.
2. Type allocation. Assign each requirement to a window type and, where relevant, to a level or orientation zone.
3. Evidence check. For each type, confirm a test report, calculation or certificate exists and covers the actual configuration, size, glazing, frame and fixing.
4. Model reconciliation. Cross-check the schedule values against the energy model, the acoustic model and the structural calculations. Any mismatch is a coordination issue, not a documentation issue.
5. Sign-off. Record who verified each line and the date, so the register becomes an audit trail rather than a working note.

For a deeper guide to wind load, movement joints and NCC 2022 evidence, see structural compliance for complex facade designs.

Watch out: a drawing that meets the aesthetic intent but never states the performance requirement will pass review and fail on site, and the failure will be attributed to the fabricator, not the missing requirement.

Common Window Wall Design Coordination Mistakes to Avoid

The mistakes we see most often are predictable. Avoiding them saves more time than any software tool.

• Leaving coordination until shop drawings. By then, the cheap fixes are gone.
• No single source of truth. Two drawing sets, two answers.
• Vague tolerances. Everyone assumes something different.

Window wall design coordination is not a drawing task. It is a set of decisions made early, written down, and checked by name.

BluePrint Facade provides professional facade and glazing shop drawings, including window wall and curved window design solutions, with technical documentation for Alspec, Capral and Darley systems.

The article lists the coordination mistakes it sees most often, each paired with the consequence that follows.

Add blueprintfacade.com.au as a preferred source on Google →