Interior assemblies · Partitions & Linings
Internal Glazed Partition System
This entry explains how an internal glazed screen is organised around a facing that can neither flex nor be trimmed on site, so the head allowance and the floor tolerance stop being detailing preferences and become the whole design.
Educational reference entry. How this system behaves depends on climate, jurisdiction, loading, substrate, the adjacent systems it meets, how the building is used, the manufacturer's instructions and qualified professional design.
Overview
What glazed partition is
An internal glazed screen divides space while keeping it visually connected. Panels are held at head and base in channels or framing, joined to each other along their vertical edges, and sealed where the screen meets walls, floor and ceiling. A door is frequently set within the run, and the screen often forms the boundary of a meeting room, an office or a stair enclosure.
The facing is the unusual part. Glass cannot be scribed, planed or eased in place; a panel either fits the opening it was measured for or it is scrap. Everything a framed partition absorbs quietly in its jointing - a soffit that is not level, a floor that falls away, a structure that deflects once it is loaded - has to be given somewhere to go in the channels and joints instead.
That is why the head detail is effectively the system. The same screen beneath a concrete slab and beneath a timber floor is not the same assembly, because the movement it has to tolerate differs, and the allowance built into the head is what decides whether the glass ends up carrying load it was never intended to take.
Terminology
Common names and aliases
These names describe the same assembly. The encyclopedia keeps one entry per system so that a trade term or a regional name never becomes a second, thinner page.
- glass partition
- internal glazed screen
- framed glass partition
- office glazing screen
Purpose
What this system is intended to do
The job the assembly exists to perform, conceptually. An intention is not a guarantee that any particular build achieves it.
- Divide interior space while keeping daylight and sightlines running through it.
- Carry a rigid facing that cannot be adjusted in place, within tolerances resolved before manufacture.
- Keep movement in the structure above the screen out of the glass and out of its joints.
- Make the presence of the screen apparent to people moving through the space.
Composition
The roles this system is made of
What each part does in the assembly and what it depends on — never a product, a thickness, a fixing or a determination that anything is adequate for the role.
Order is not meaningful in this system. These roles interact as parts of one whole rather than stacking up in a sequence, so the list below is not a build-up and nothing should be read into the order it appears in.
- Primary supportHead channel and its movement allowance
The section fixed to the structure or the ceiling above, holding the panel tops and providing the gap that lets the structure move without bearing on the glass. It is the component most often reduced on site and the one least able to spare anything.
- Edge and terminationBase channel and floor tolerance
The section at floor level, locating the panel feet and taking up whatever the finished floor actually does along the run. A floor that rises or falls beneath the screen shows immediately, because the panel tops are set to a line and the joints between them are vertical.
- Finish surfaceThe glass panels
The facing, sized for the opening measured before manufacture. Panels carry their own weight down to the base channel and rely on the head only for restraint, and how their edges are supported is what keeps that arrangement true over time.
- AttachmentSetting blocks, gaskets and edge support
The small components keeping the glass clear of metal, spreading its bearing at the base and holding it centrally in the channel. They are the reason the glass is not in direct contact with anything hard, and their omission is invisible until it is not.
- Jointing and sealingVertical joints and abutment seals
The treatment between adjacent panels and where the screen meets walls, floor and soffit. These joints, together with the channels at head and base, are where the assembly's tolerance is held: whatever the surrounding construction fails to deliver exactly has to be taken up here, because the panels themselves cannot be altered.
- Edge and terminationIntegrated door and its frame
Where a door sits in the run, its frame interrupts the glass line and takes repeated impact from opening and closing. The junction between frame, adjacent panels and the head above is the most heavily worked point anywhere in the screen.
- ProtectionVisibility marking
Applied marking, an interrupted pattern or a frame line making the glass apparent to someone walking towards it. What is required, where it goes and in what form is a matter for the designer and the relevant authority rather than a decorative choice.
Interaction
How the parts work together
The reason this is a system rather than a list of parts: what depends on what, and what stops working when one part is changed.
The head and the base do opposite jobs and depend on each other to do them. The base carries weight and sets the line; the head restrains and must not carry anything. If the head closes up, because the structure deflects, because the allowance was taken up during installation or because a seal was packed solid, the glass begins taking load through its edge, and the failure that follows appears in the panel rather than in the detail that caused it.
Tolerance travels through this assembly in a single direction. Every deviation in the soffit, the floor and the abutting walls has to be absorbed by the channels and the joints, because the panels themselves are fixed dimensions. That makes the survey preceding manufacture part of the system: the screen is designed against measured reality, and anything that changes after measurement has to be absorbed by joints sized for something else.
Closure and movement have to be reconciled at every abutment, and the opposition is not between sealing and moving. A joint closed with a flexible sealant over a backing stays continuous while the construction either side shifts; a joint packed hard or filled solid closes the same gap by bridging it, and at the head that turns the abutment into a route for load into the glass. What each joint has to accommodate, and therefore what belongs inside it, is a design decision rather than a choice made with a sealant gun in hand.
The door concentrates all of it. It adds impact, it introduces a hard frame into a run of deliberately flexible joints, and it leaves a gap that no seal closes. A screen assessed as a continuous glazed plane and then given a door has been assessed as something it is not, and the difference shows up first in what people can hear through it.
Materials
Material families commonly met in each role
Commonly encountered, not recommended. Whether a material suits a given project depends on the whole assembly, the exposure, the manufacturer's documentation and qualified professional review.
Finish surface
These glass families are commonly encountered as the facing. Where glass sits in a position people may walk into or fall against, the applicable safety requirements are determined by qualified professionals and the relevant authority, and this entry states none of them.
Primary support
Extruded and formed metal sections and timber members are commonly encountered as head and base channels and as framing. Which arrangement belongs in a given screen is settled by the designer against the manufacturer's documentation and the structure above.
Jointing and sealing
Sealant and backing families of this kind are commonly encountered at panel joints and abutments. What a joint has to accommodate, and therefore what belongs inside it, is a design decision rather than a property of any sealant.
Protection
Applied films are commonly encountered where marking, obscuring or patterning is added to a completed screen. Whether an applied treatment is appropriate to a particular glass, and what it is required to achieve, is a matter for the designer and the product documentation.
Junctions
Where this system meets others
Interfaces are where most assemblies actually fail, so they are set out explicitly rather than left inside the prose. What resolves a junction is a detail designed for the specific building — not a rule of thumb.
Screen head against a suspended ceiling
A screen fixed to a ceiling rather than to the structure transfers into a system designed to hold boards, not to restrain glass. It also stops at the ceiling line, so the void above remains open across the division unless something else has been arranged to close it.
Read about Framed Board Ceiling →Head landing on a lay-in grid
Where the head meets a grid ceiling, the screen has to align with the grid module or accept a cut tile along its whole length. The junction is also where an accessible ceiling stops being accessible, because tiles on either side can no longer be lifted freely.
Read about Demountable Ceiling →Base channel on a raised floor
A screen standing on removable floor panels rests on something designed to be lifted. Which panels are captured beneath the screen, and how the underfloor zone crosses the division, are questions that have to be answered before the panel layout is fixed.
Read about Service Void →Abutment with a boarded partition
The screen meets a wall built to different tolerances and with a face that can still be adjusted. The junction is where a rigid, factory-sized element meets a forgiving one, and it is normally the boarded side that is expected to take up whatever difference appears.
Read about Framed Partition →Floor finish beneath and either side of the screen
The base channel sits on or within the floor finish, so the finish has to run flat along the screen line and be either continuous or deliberately stopped beneath it. A change of floor material at the division is a junction that must line up with a joint set out for other reasons.
Considerations
Topics worth discussing
Which topics genuinely apply to this system and what to raise about them. Measured values, classes and ratings come from a qualified professional's design for the specific building, not from a reference page.
- Movement
- The allowance provided at the head exists to absorb movement in the structure above, and it is consumed by anything that fills it. This entry states no dimensions; how much is required is a structural question answered before the screen is measured, not afterwards.
- Acoustic
- Expectations of privacy across a glazed screen are frequently higher than the assembly can meet, because the head, the base, the joints and the void above all carry sound. Acoustic behaviour belongs to the complete tested assembly and to a qualified acoustic professional.
- Buildability
- The screen is manufactured against a survey and installed as fixed pieces, so late changes to the ceiling line, the floor finish or the abutting walls cannot be absorbed. Establishing when the survey is taken, and what must be complete by then, is part of the design.
- Interfaces
- Almost every difficulty in a glazed screen occurs where it meets something else, because the surrounding construction is built to tolerances the glass cannot answer. The abutment details deserve far more attention than the panels themselves.
- Maintenance and access
- Panels can usually be removed, but only in the order and direction the assembly allows, and a damaged panel is replaced rather than repaired. Whether replacement is practicable without dismantling adjacent construction is worth establishing early.
Design
Questions the design has to answer
The decisions this assembly turns on. They are questions rather than answers, because the answer depends on the building.
- What sits above the head of this screen, and how much can it move once the building is in use?
- Has the floor line along the screen been surveyed, and what happens where it turns out not to be flat?
- Is the screen required to run past the ceiling line, and if not, what closes the void above it?
- Where does the door sit within the run, and how does its frame meet the panels on either side?
- What is expected of this screen in terms of privacy, and does the assembly actually support that?
- How would a damaged panel be replaced once the surrounding construction is complete?
Boundaries
Commonly misunderstood points
Distinctions that are easy to blur, and the places where a familiar term means something narrower than it sounds.
- A glazed screen is treated as an off-the-shelf item, when it is manufactured against a survey of one specific opening.
- Privacy is expected of a screen chosen for transparency, and the disappointment is blamed on the glass rather than the junctions.
- The gap at the head is read as a defect to be filled, when it is the allowance the whole assembly depends on.
Conversations
Questions for qualified professionals
Bring these to the relevant qualified professional, manufacturer or authority. Requirements vary by project and location.
- What movement does the structure above this screen impose, and how is it accommodated at the head?
- Which glass requirements apply in this position, and who is confirming them?
- When is the survey taken, and what construction must be complete before it?
- What is the intended junction where the screen meets the ceiling and the void above it?
- How is the door in this run supported, and what does it do to the panels beside it?
What this page does not do
- Safety glazing requirements in positions where people may walk into or fall against glass are determined by qualified professionals and the relevant authority.
- Filling or packing the head allowance can transfer structural load into the glass, and the consequence appears in the panel rather than in the detail.
- No value for privacy, separation or fire performance is stated here, and none should be inferred from the presence of a glazed screen.
Related systems
How this system relates to others
Every link states what the relationship actually is, rather than leaving a bare list of related pages to be read as a suggestion.
Alternatives
Different systems answering the same need. Listing them together is not a comparison and does not suggest one is better — which, if either, suits a project is a design decision.
Meets these systems
Systems this one physically meets. The junction is usually where the design problem lives, so these are worth reading together.
Go deeper
Related Build Design Hub guides
Planning guidance behind the decisions this assembly involves.
Preparation
Related planning checklists
Owner-side preparation before the conversation where this system comes up.
Inspiration
Related Ideas Library pages
Design directions where this system commonly appears.
Internal Partitions, Linings, Ceilings and Wet Areas
Internal elements whose behaviour comes from the framework, the void and the perimeter behind them rather than from the board or tile on the visible face.
Browse all partitions & linings entries →