15mm Plasterboard

15mm plasterboard provides a thicker, tougher lining than standard 12.5mm sheets. It is the ideal choice for areas that need greater strength, soundproofing, or fire resistance.

What Is 15mm Plasterboard?

15 mm plasterboard is a gypsum-based wallboard with a paper facing, cut into 15 millimetre-thick panels. This added depth makes it stiffer and heavier than standard boards.

This improves impact resistance, reduces sound transfer between rooms, and enhances performance in sound or fire-rated systems.

It comes in specialised types that include 15mm acoustic plasterboard, 15mm MR plasterboard, and 15mm fire rated plasterboard sheet.

What Are 15mm Plasterboards Used For?

15mm plasterboards are mainly used to improve structural rigidity, impact resistance, and protection:

• It is used wherever standard sheets fall short, for instance, in corridor walls, stairwells, and busy commercial spaces.
• It is ideal for acoustic and fire-rated wall systems, such as those separating flats, offices, or studios.
• Used in multi-layer systems to help meet fire safety and sound insulation standards.

Types of 15mm Wallboard

Below are the main 15mm options and what they do:

15mm Wallboard (Standard Grade)

Plain 15mm wallboard is easy to trim and fit. It works well in heavy-use areas where a stiffer surface helps prevent dents and movement.

15mm Acoustic Plasterboard

A denser 15mm board – like the 15mm SoundBloc plasterboard – is designed to reduce airborne noise. It helps keep voices and TV sound from carrying through partitions. Use it with insulation in the cavity and with good perimeter sealing for the best results.

15mm Fire Plasterboard

A reinforced gypsum board that resists high temperatures longer than plain board. An example is the 15mm FireLine plasterboard. It is used where a wall or ceiling must meet a tested fire rating. Install it as part of the manufacturer’s approved system to achieve the stated fire period.

15mm Moisture-Resistant Plasterboard

It has a moisture-resistant core that limits vapour transfer into the material. Easy to fix, tile, and finish, just like a standard board, but tougher when it comes to moisture protection. It is the best option for kitchens, bathrooms, and other wet areas.

Benefits of 15mm Drywall Board

These are the benefits of 15mm drywall boards:

• Stronger finish: Less flex, fewer surface knocks, and a firmer feel.
• Better fire resistance: Works as part of fire-tested systems to meet higher safety standards.
• Improved sound control: Denser boards reduce noise transfer compared to thinner sheets.
• Cleaner finishes: Takes jointing, sanding, and skim coats well.
• Compatible with standard systems: Fixes to timber or metal studs and can be used in multi-layer builds.

Why Choose Our 15mm Thick Plasterboard?

This is why Insulation Wholesale is the UK’s preferred store for 15mm plasterboards:

• We stock branded, trade-grade 15mm wallboard from recognised UK manufacturers.
• Each product is selected for consistent thickness and reliable performance.
• You’ll get boards that fit standard systems, arrive in good condition, and perform as described in the technical information.
• We offer project-ready stock at volume prices with fast nationwide delivery.
• If you need help matching a board to a particular build, our team can advise on the right type and installation method.

Looking for tougher, quieter, or more fire-resistant linings? Browse our 15mm wallboards online, and order trade packs or single sheets with fast UK delivery.

FAQ

Where to buy 15mm plasterboard?

You can buy 15mm plasterboard online from Insulation Wholesale. Insulation Wholesale holds UK stock and will deliver pallet quantities to your door at low wholesale prices. Confirm stock availability for specific variants, such as SoundBloc or FireLine, before placing your order.

What size screws for 15mm plasterboard?

38mm drywall screws are a standard choice for fixing 15mm panels to timber or metal studwork. To fit two layers of plasterboard, use 50mm (or the manufacturer’s recommended size) to properly anchor both layers to the frame. Whichever size you choose should be long enough to penetrate the framing while gripping securely.

Why use 15mm plasterboard?

15mm plasterboard provides greater strength, fire resistance, and sound insulation than standard 12.5mm sheets. Its extra thickness improves wall stability and noise control, making it suitable for demanding environments.

When to use 15mm plasterboard?

Use 15mm plasterboard:

• To get a fire-rated system.
• When building acoustic partitions.
• For stiffer walls or smoother ceilings with reduced deflection.
• When installing multi-layer systems that rely on a thicker base layer for certification.
• For high impact resistance and compliance with Part B and Part E of the Building Regulations for acoustic and fire safety performance.

How to cut 15mm plasterboard

To cut a 15mm board:

• Mark the cutting line with a pencil and straightedge.
• Score along the face with a sharp utility knife or drywall knife.
• Snap the board away from the scored side.
• Turn the board and cut the back paper layer to separate cleanly.
• Smooth any rough edges.