Knauff Soundshield Plus Acoustic Plasterboard - 12.5mm

• Decoupled ceiling systems — fix to MuteClip Channel as the finish layer in a clip and channel acoustic ceiling assembly. The higher mass of Soundshield Plus compared to standard plasterboard increases the sound reduction performance of the decoupled system, particularly for airborne noise.
• Acoustic stud walls and partitions — use as the finish board on acoustic stud wall assemblies where enhanced sound attenuation is required. Can be used in single or double layer configurations depending on the performance specification.
• Direct fix to masonry — suitable for direct bonding to masonry walls using acoustic adhesive where a higher-mass finish layer is required without a full independent frame.
• Fire-rated assemblies — Soundshield Plus provides excellent fire resistance alongside its acoustic performance, making it suitable for assemblies where both acoustic and fire specifications must be met.

• High-density tuned core — increased surface mass. The higher mass of Soundshield Plus compared to standard plasterboard increases the energy required to vibrate the structure, improving airborne sound reduction across the assembly. At 33.12kg per sheet, the 12.5mm board is the lighter option and is suited to assemblies where a marginal reduction in build-up thickness is required.
• Tapered edge — suitable for jointing. The tapered edge profile allows standard jointing tape and compound to be used, producing a flush, paintable finish consistent with standard plasterboard installation practice.
• Excellent fire resistance. Provides fire resistance performance alongside acoustic attenuation — suitable for assemblies where both properties are specified.
• 1200 × 2400mm sheet size — 2.88m² per sheet. Standard sheet size compatible with typical stud and joist centres.

Fix to MuteClip Channel, metal or timber studwork, or masonry using appropriate fixings or adhesive per the assembly specification. Stagger board joints and ensure no board makes direct contact with the surrounding structure in decoupled assemblies — any contact creates a sound bridge and reduces performance. Tape and joint all seams. Seal all perimeter gaps with AC95 Acoustic Sealant.

Is acoustic plasterboard enough on its own, or do I need a full system?

It adds mass compared with standard plasterboard, but it does not independently address every transmission path. If noise travels through structural connections or gaps, board alone may not meet your expectations. Choose the build-up around the wall or ceiling construction and the type of noise.

Can I use one thicker layer instead of two specified layers?

Do not substitute by thickness alone. Layering, total mass, staggered joints and fixing details are part of the assembly design. Where two layers are specified, replacing them with one board changes that design.

Can I use 12.5mm boards in a system that specifies 15mm?

Only after checking the revised assembly. The thinner board changes both mass and loading, so it is not an automatic equivalent. Choose 12.5mm where it is suitable for the specification, not simply to reduce the order cost.

Will installation and decorating be different from ordinary plasterboard?

The tapered-edge boards use familiar jointing and finishing methods, but the handling weight needs planning. The listed sheets weigh 33.12kg for 12.5mm and 38.3kg for 15mm. For an acoustic installation, preserving perimeter separation and sealing is also essential.

Why is delivery charged on this product?

Due to the weight of this product, orders are shipped via a specialist freight company rather than standard parcel delivery. Delivery is still on a next-day service. For larger quantities, orders may be dispatched on a pallet. If you would prefer to collect, this option is available at the payment stage — our facility is located in Mansfield, Nottinghamshire.