Water Resistant Plasterboard

Frequently Asked Questions

What is Moisture Resistant Plasterboard?

Moisture resistant plasterboard, sometimes called green plasterboard, is a type of plasterboard specifically designed to withstand damp and humid conditions, making it ideal for use in areas such as bathrooms, kitchens, and utility rooms. It is manufactured with additives in the core and a water-repellent facing to provide enhanced resistance to moisture. This ensures the board maintains its structural integrity and prevents mould growth.

How to Install Moisture Resistant Plasterboard

To install moisture resistant plasterboard, first ensure the framing is correctly spaced and prepared. Cut the plasterboard to fit, using a utility knife or plasterboard saw, and position it with the green side facing outwards. Secure the boards to the studs with galvanised screws or nails, spacing them approximately 200mm apart along the edges and 300mm in the centre. Leave a small gap between the boards and the floor to prevent moisture wicking, and use joint tape and a moisture-resistant joint compound to seal the seams. Finally, sand the joints smooth once dry, and finish with a suitable primer and paint for added protection.

Types of Moisture Resistant Plasterboard

Our range of Moisture Resistant Plasterboards are manufactured by leading brands such as Knauf Moisture Board and British Gypsum (“bg”). Sometimes referred to as “waterproof” plasterboard, though there are many manufacturers of moisture resistant plasterboard, the vast majority of boards are identified by their blue / green paper facing and have extremely similar properties owing to the fact that they are intended to conform to the same building regulations - BS EN 520, though some have a slightly greater moisture resistance grade (h2, rather than H1).

Why Choose Water Resistant Plasterboard?

Standard plasterboard deteriorates rapidly in high-humidity environments, leading to structural damage, mould growth, and costly repairs. Our premium water resistant plasterboard provides the essential barrier your project needs, combining moisture protection with exceptional workability.

The benefits that matter to you:

Enhanced moisture resistance for long-term durability
Reduced risk of mould and mildew formation
Superior structural integrity in wet environments
Professional finish that stands the test of time

Leading British Manufacturers We Trust

Knauf - Pioneers in moisture-resistant technology, their Aquapanel range offers exceptional performance in challenging conditions. With over 85 years of expertise, Knauf's water resistant plasterboard delivers reliable protection you can depend on.

British Gypsum - As Britain's leading plasterboard manufacturer, their Gyproc range includes premium moisture-resistant solutions specifically engineered for UK conditions.

Siniat - Renowned for technical innovation, Siniat's PregyBoard H1 provides superior moisture resistance whilst maintaining excellent handling characteristics for both professionals and DIY enthusiasts.

Applications That Demand Water Resistant Solutions

Bathroom installations - Protect wall structures behind tiles and sanitary fixtures where steam and splashing create constant moisture challenges.

Kitchen environments - Shield walls around sinks, dishwashers, and cooking areas from humidity and water exposure.

Utility rooms - Safeguard areas housing washing machines, tumble dryers, and water heating equipment.

Technical Excellence You Can Rely On

Our water resistant plasterboard meets stringent H1 classification standards, ensuring moisture absorption remains below 10% even under prolonged exposure. The enhanced core formulation incorporates moisture-repelling additives whilst maintaining the structural properties essential for successful installation.

Expert Guidance When You Need It

Choosing the right specification doesn't have to be complicated. Our experienced team understands that every project presents unique challenges. We're here to provide expert advice that ensures your project succeeds, from thickness selection to fixing requirements and vapour barrier considerations.

Quality Assurance and Competitive Pricing

At DIY Building Supplies, we believe superior protection shouldn't come at a premium price. Our established relationships with leading manufacturers enable competitive pricing on genuine, certified products. Every sheet is quality-checked before dispatch, with reliable delivery across mainland UK.

Ready to specify the right water resistant plasterboard for your project? Contact our expert team today. We're here to ensure your project achieves the professional results you demand.