Coatings and interior systems · Acoustic & Specialty
Perforated Acoustic Plasterboard Panels
Sets out how factory perforated gypsum board differs from plain plasterboard in setting out, cutting, jointing and decoration, so pattern continuity can be discussed before the lining is built.
Educational reference entry. Suitability depends on the complete assembly, substrate, exposure, installation method, manufacturer documentation, local requirements and qualified professional review.
Overview
What perforated board is
Perforated acoustic plasterboard begins as an ordinary gypsum core with paper facings, and is then punched or routed with a repeating pattern of round holes, square holes or slots and backed on the reverse with a bonded fleece. It is supplied as flat boards, often with a plain margin along one or more edges, and is screwed to a metal or timber frame in much the same way as any other lining board.
What separates it from the plain plasterboard entry is that the pattern is fixed in the factory and the site has to work around it. Plain board can be cut anywhere and jointed anywhere. Perforated board cannot, because every cut lands somewhere within the pattern. Board layout, joint positions, the plain border at the room edge, and the way the pattern continues around downlights, sprinklers and grilles all have to be set out on a drawing before the first board is lifted into place.
The perforation is a route for sound to reach whatever sits behind the board, not a decorative finish in its own right. The fleece, the cavity depth and any material in that cavity are all part of the arrangement. That also constrains decoration: the holes must not be filled, which rules out the usual approach of skimming the whole face or rolling paint liberally across it.
Terminology
Common names and aliases
These names describe the same thing. The library keeps one entry per material so that an acronym, a trade name or a regional spelling never becomes a second, thinner page.
- perforated gypsum panel
- slotted plasterboard
- acoustic perforated board
Applications
Common applications
Where this material is typically encountered. A typical application is not a statement that it suits your project.
- Continuous plasterboard ceilings in offices, foyers and halls where a grid module is not wanted.
- Wall linings in rooms where a flush plastered appearance is required alongside an absorbent build-up.
- Auditoria, lecture rooms and worship spaces where a specialist has set out an absorption strategy.
- Circulation spaces where the board reads as a subtly textured plain surface rather than as a panel.
- Ceilings where a plain perimeter margin frames a perforated field in the centre of the room.
Consideration
Where it is commonly considered
- Where a seamless plastered look is wanted but a fully closed ceiling would leave the room too live.
- Where an acoustic professional has specified an absorbent build-up and a jointless appearance is required.
- Where the ceiling can be drawn and set out fully in advance rather than resolved as work proceeds.
- Where the same pattern needs to run across walls and ceilings as a single continuous field.
- Where an installer experienced in patterned board jointing is available for the work.
Professional review
Where additional professional review is especially important
These are the situations where the answer depends on the specific building, and where a qualified professional should be involved before anything is decided.
- Where regular access above the lining is needed, since this is a fixed surface rather than a demountable one.
- Where the layout is likely to change during construction and the pattern set out cannot be frozen early.
- In humid or wet areas, where the board type, backing and cavity all need product specific confirmation.
- Where compartment or fire requirements apply to the lining, which belong to the tested assembly and the relevant authority.
- Where later redecoration by ordinary painting is expected, because filling the perforations changes what the board does.
- Where the cavity behind cannot be formed as the manufacturer's arrangement requires.
Properties
Key properties to discuss
Qualitative topics worth raising. Measured values, classes and grades come from the manufacturer's technical documentation for the specific product, not from a reference page.
- Installation dependency
- This board is set out rather than simply fixed. Joint lines, the position of the plain margin, board direction and the pattern around every penetration are decided on a drawing, and a board cut in the wrong place cannot be corrected afterwards.
- Acoustic behaviour
- Perforation opens a path to the fleece and cavity behind, so any absorbent effect belongs to that whole build-up and to the room, never to the board alone. Measurable expectations are for an acoustic professional to set.
- Appearance
- From a distance the field reads as a lightly textured plane, and close to, the pattern geometry dominates. Alignment across joints, the width of the plain border and the treatment around lights are what make it look considered.
- Repairability
- Damage is harder to make good than on plain board, because a patch has to align with the pattern in both directions. Keeping offcuts and recording the board reference makes a future repair far more likely to disappear.
- Maintenance
- The face cannot be redecorated in the usual way. Filling holes with paint or filler closes the very route that the board exists to provide, so any decoration must follow the manufacturer's method or be avoided.
- Substrate dependency
- The frame behind must suit the board layout, since fixings and joints have to land on framing that itself follows the pattern set out. Frame centres and board direction are therefore decided together.
- Fire-related questions
- Perforated board is not a substitute for any tested lining arrangement, and nothing about fire can be inferred from a gypsum core. Requirements and classifications rest with the manufacturer's documentation and the relevant authority.
Exposure
Exposure and environmental conditions
- What humidity will the room reach, and is a moisture resisting board variant being considered?
- Is the building dried out and stable before the boards are fixed and jointed?
- Will the cavity behind the lining be ventilated, sealed or filled, and by whom?
- Could condensation form on any surface within the cavity behind the perforations?
- Is dust from the room likely to collect visibly in the perforations over time?
Assembly
Substrate and system dependencies
What this material sits on, is fixed to or depends on. This is usually where performance is won or lost.
- What frame is the board fixed to, and have centres been set to suit the board layout?
- What material sits in the cavity behind, and who has specified it?
- How deep is the cavity, and has that been coordinated with services above the lining?
- How do the boards meet a plain plasterboard margin or an adjoining lining?
- Where do access panels sit, and how are they framed within the pattern?
Appearance
Appearance and finish considerations
- Which perforation pattern has been chosen, and has it been seen as a whole panel rather than a sample?
- Does the pattern run continuously across joints, or is a plain band accepted at each junction?
- How wide is the plain border at walls, and is it consistent all around the room?
- How are downlights, detectors and grilles positioned relative to the pattern?
- What decoration is intended, and does the manufacturer accept it on a perforated face?
- Will the fleece behind be visible through the holes, and is its colour acceptable?
Durability
Durability questions
Questions to raise rather than a service life to expect. No material has a universal lifespan — it depends on the assembly, the exposure and the upkeep.
- How exposed is the lining to knocks, and how does a perforated face behave when struck?
- Are the perforated edges of the board fragile during handling and fixing?
- Will the surface be touched or leaned on at low level, and is a plain band preferable there?
- How well do the jointed pattern lines hold as the building moves and dries?
- Is cracking at joints more visible on a patterned face than on a plain one?
Upkeep
Maintenance and repair considerations
- Have offcuts and the board reference been kept so a future patch can match the pattern?
- What does the manufacturer say about cleaning and about any decoration of the face?
- Who will carry out repairs, and are they familiar with patterned board jointing?
- If a section must be opened for access, how will the pattern be reinstated?
- Is anyone likely to paint the ceiling conventionally without understanding the consequence?
Installation
Installation dependencies
What the installation depends on — not how to do it. Method belongs to the manufacturer's instructions and the trades carrying out the work.
- Has a full setting out drawing been produced and agreed before ordering the boards?
- Is the installer experienced with jointing so the pattern stays continuous?
- Are penetrations positioned to suit the pattern, or is the pattern being cut to suit them?
- Is the correct jointing method for perforated board being used rather than a general one?
- Are boards stored flat and dry, given how much handling the perforated face tolerates?
Documentation
Documentation to request
Ask for these in writing, for the specific product being proposed, and keep them with the project record.
- The manufacturer's board data for the exact pattern, edge type and backing fleece.
- The system's own jointing and finishing instructions for perforated boards.
- Details for the cavity arrangement and any material the manufacturer expects behind it.
- Guidance on decoration, cleaning and permitted repair methods for the face.
- Anything the relevant authority requires of the completed lining.
Conversations
Questions for qualified professionals
Bring these to the relevant qualified professional, manufacturer or authority. Requirements vary by project and location.
- Who has produced the setting out drawing, and has the client seen the pattern layout?
- What sits behind the board, and who specified the cavity arrangement?
- Is the objective reverberation control in this room, or privacy from the room next door?
- Which acoustic professional is advising, and what have they asked this lining to contribute?
- How will the pattern be handled around lights, detectors and any access panels?
- What decoration is permitted by the manufacturer, and who will be told at handover?
- How is the lining detailed where it meets partitions, bulkheads and plain board?
- What does the relevant authority require of this lining, and who is confirming it?
Blind spots
Commonly overlooked points
- A single coat of ordinary paint applied by a well meaning decorator can undo the reason the board was specified.
- The pattern has to be resolved before ordering, which pulls a normally late decision to a much earlier point in the programme.
- Cut boards at the perimeter leave part holes that look untidy unless a plain margin was planned from the start.
- Access above a continuous perforated lining means cutting it, so access panels belong in the setting out drawing.
- The fleece behind the holes is visible in raking light, and its colour is part of the finished appearance.
What this page does not do
- This page gives no absorption values or classes. What a perforated lining achieves depends on the fleece, the cavity, the material behind and the room, and is a matter for an acoustic professional.
- Reducing echo within a room is not the same as reducing sound passing between rooms, and a perforated lining that helps the first may contribute nothing to the second.
- No fire performance is stated or implied here, and the gypsum core supports no conclusion of that kind on its own.
- Wet and humid area use depends entirely on the specific board and build-up, confirmed in the manufacturer's own documentation.
Related entries
Related materials
Materials from the same family, an adjacent role in the assembly, or a shared application.
Inspiration
Related Ideas Library pages
Design directions where this material commonly appears.
Preparation
Related planning checklists
Owner-side preparation before the conversation where this material comes up.
Go deeper
Related Build Design Hub guides
Planning guidance and neutral comparisons behind the decisions on this page.
Acoustic & Specialty Interior Surfaces
Reference entries for ceiling systems, acoustic linings and specialty interior surfaces — suspended grids and tiles, perforated and seamless acoustic finishes, baffles, and glass and metal facings.
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