15mm Plasterboard
(10 Products)15mm thickness is a high-performance gauge engineered for applications where enhanced fire resistance, superior acoustic insulation, and increased structural rigidity are mandatory. This thickness is the professional benchmark for meeting 60-minute fire ratings and stringent sound-reduction standards in both commercial partitions and residential separating walls.
Engineering & Specification Requirements
Specifying 15mm plasterboard is a technical necessity when a project demands higher levels of fire protection or sound insulation within a single-layer system. The increased density and thickness provide a more rigid substrate that significantly reduces board deflection and vibration. This makes it particularly effective for tall partitions or ceilings with wider joist centres, where the extra material depth ensures a flatter, more stable finish that resists structural movement.
In commercial settings, 150mm stud partitions often utilise 15mm linings to achieve the "Severe Duty" rating required for high-traffic areas like schools or hospitals. The additional 2.5mm of gypsum core compared to standard boards translates into a substantial increase in impact resistance. Furthermore, in many fire-rated specifications, a single layer of 15mm fire-resistant board can achieve the same protection as multiple layers of thinner materials, streamlining the installation process and reducing the overall wall profile.
Application & Format Selection
- High-Traffic Hallways: 15mm Impact-Resistant or standard wallboards used to withstand daily wear in public buildings.
- Separating Floors & Walls: 15mm Sound Boards (Blue) applied to reduce airborne noise between flat conversions or semi-detached dwellings.
- Commercial Kitchens: 15mm Moisture Boards (Green) used in large-scale catering environments where high humidity and structural durability are required.
- Garage Ceilings & Lift Shafts: 15mm Fire Boards (Pink) utilised to provide a robust fire barrier in critical safety zones.
- Large Span Ceilings: 15mm Tapered Edge boards selected to prevent sagging and provide a seamless finish over expansive ceiling areas.
Frequently Asked 15mm Plasterboard Questions
What length of screw is needed for 15mm plasterboard?
You should use 42mm or 45mm drywall screws. Using the standard 38mm screws used for 12.5mm boards will not provide sufficient penetration into the stud-work, potentially leading to board failure or sagging over time.
Is 15mm plasterboard much heavier than 12.5mm?
Yes, a 15mm sheet is approximately 5% to 10% heavier than a 12.5mm sheet of the same type. This extra mass is what provides the improved acoustic and fire performance, but it usually requires two-person handling for ceiling installations.
Does 15mm board provide better soundproofing than two layers of 9.5mm?
Generally, a single 15mm acoustic board is more effective than two layers of 9.5mm standard board because the 15mm acoustic board has a much higher density-to-volume ratio, which is more effective at blocking sound energy.
