Soundproofing Plasterboard | Acoustic Plasterboards

Looking to cut down noise transfer between rooms, flats, or busy hallways? Acoustic (soundproof) plasterboard adds mass and specialist cores that help block and damp sound, making it ideal for stud walls and ceilings in bedrooms, home offices, media rooms and multi-occupancy housing.

What Is Soundproofing Plasterboard?

Soundproofing plasterboard is a high-density gypsum board engineered to reduce airborne noise between rooms. Extra mass and a specialised core absorb and block sound waves, making it far more effective than standard plasterboard. It is ideal for internal walls, ceilings and partitions where peace and privacy are essential.

Benefits of Soundproofing Panels

• Superior Noise Reduction – Thicker, denser boards deliver higher acoustic performance, limiting sound transfer from music, TV or conversation.
• Easy to Install – Cuts, screws and tapes like regular plasterboard, so no special tools are needed.
• Fire & Impact Resistance – Many products combine acoustic insulation with fire-rating and added durability for busy areas.
• Moisture Options – Moisture-resistant variants (e.g. Knauf Soundshield Plus) protect against damp and humidity.
• Cost-Effective Upgrade – A simple way to achieve Part E Building Regulations without major structural changes.

Applications of Acoustic Plasterboard Insulation

• Bedrooms, nurseries and home offices
• Party walls and ceilings in flats or HMOs
• Media rooms, home cinemas and recording spaces
• Busy corridors, stairwells and plant rooms
• Commercial spaces needing privacy, such as clinics or meeting rooms

Acoustic Plasterboard Guide

Acoustic plasterboard works by adding mass to a wall or ceiling lining. More mass makes it harder for airborne sound energy from speech, television and music to pass through the construction. The board is only one part of the result, however. Stud depth, cavity insulation, number of board layers, resilient channels or bars, junction details, sockets, doors and perimeter sealing can all change the acoustic performance of the finished system.

That distinction matters when comparing products. A board weight or density is a product property. A decibel rating normally belongs to a tested wall, floor or ceiling system rather than to a single sheet. For that reason, choose the board first by the build-up you are constructing, then check the complete manufacturer system where a defined acoustic target or Building Regulations requirement applies.

12.5mm or 15mm Acoustic Plasterboard?

Choose 12.5mm where lining depth, handling weight and cost matter and the specified system allows it. Choose 15mm where the system calls for the thicker board or where additional lining mass is useful. The extra 2.5mm also changes sheet weight, so allow for manual handling and make sure the framing and fixings follow the board and system manufacturer’s instructions.

Where to Use Acoustic Plasterboard

Installation Details That Make a Difference

Cut and handle acoustic plasterboard as a dense drylining board and support full sheet edges as required by the chosen system. Tapered-edge boards are intended for taped and jointed finishes, although they can also be skimmed where the manufacturer’s finishing system permits. On multi-layer linings, avoid lining up joints through successive layers.

Pay particular attention to flanking paths. Back-to-back socket boxes, open service holes and gaps at head, base and abutments can undermine an otherwise good wall. Use suitable acoustic sealant where the system calls for it. Do not substitute ordinary decorator’s caulk for a specified acoustic seal because the tested build-up relies on the correct components and detailing.

For existing walls, overboarding can add useful mass, but first establish what the existing lining is fixed to and where secure fixings can be made. If the objective is a major reduction in neighbour noise, simply screwing one dense board directly over the old board may not address vibration travelling through the structure. An independent or resilient lining can be more appropriate where space allows.

Acoustic Plasterboard FAQs

Does acoustic plasterboard really reduce noise?

Acoustic plasterboard adds mass to a wall or ceiling lining, helping reduce airborne sound transmission. The final improvement depends on the complete construction, including studs, cavity insulation, board layers, junctions and sealing. For a defined acoustic target, use a tested manufacturer system rather than relying on a single board.

Is acoustic plasterboard better than normal plasterboard?

For sound-control applications, acoustic board normally provides more lining mass than standard wallboard. Knauf’s current data gives Soundshield Plus 12.5mm at 11.5 kg/m². The benefit is greatest when the board is combined with suitable cavity insulation and careful sealing as part of a complete wall or ceiling system.

What thickness acoustic plasterboard should I use?

The live range includes 12.5mm and 15mm acoustic boards. Use the thickness specified by the wall or ceiling system you are building. A 15mm board adds more mass but also increases sheet weight and lining depth, so framing, handling and fixing requirements must be considered before installation.

Can I put acoustic plasterboard over an existing wall?

Overboarding can add mass to an existing lining if the substrate and fixings are suitable. It does not automatically solve flanking noise or structural vibration. For substantial soundproofing work, identify the noise path first and consider whether an isolated or resilient lining with cavity absorption is required.

Can acoustic plasterboard be used on ceilings?

Yes. Knauf and Gypfor identify their acoustic boards for ceiling applications as well as partitions and wall linings. Ceiling work must follow the specified framing and fixing system because acoustic boards are heavier than standard wallboard. Check board orientation, screw type, centres and support requirements in the manufacturer’s system guidance.

Do I need acoustic insulation behind acoustic plasterboard?

Acoustic mineral wool in a stud or joist cavity is commonly used to absorb sound energy within the void and complements the mass of acoustic plasterboard. The correct thickness and density depend on the tested construction. Avoid compressing insulation or leaving large gaps where the system requires the cavity to be filled.

Do I need two layers of acoustic plasterboard?

Two board layers are used in many higher-performance acoustic systems because extra mass and correctly staggered joints can improve the construction. The number and thickness of layers should come from the tested system specification. Adding a second layer without controlling gaps, services and flanking paths may deliver less improvement than expected.

Can I skim over acoustic plasterboard?

Acoustic gypsum plasterboard can be finished using compatible jointing or plaster systems where permitted by the board manufacturer. Tapered edges are particularly suited to tape-and-joint finishes. Before skimming, check the current manufacturer guidance for board preparation, primers where required, joint reinforcement and the chosen finish product.