25KG HARDWALL PLASTER

British Gypsum Thistle HardWall 25kg Bag: Durable Undercoat Plaster for Masonry

British Gypsum Thistle HardWall is a premium, gypsum-based undercoat plaster supplied in a 25kg bag, specifically formulated for application onto most common masonry backgrounds. It's the ideal base layer for a two-coat plastering system, providing a robust, high-impact resistant, and quick-drying surface before the application of a Thistle finishing plaster (such as MultiFinish, DuraFinish, or PureFinish). HardWall is a staple for plasterers and builders looking for a reliable and durable foundation for internal walls.

Features

• Undercoat Plaster: Designed as the primary base coat in a traditional two-coat plastering system, providing the necessary bulk and strength over masonry.
• High Impact Resistance: Creates a tough, durable surface that is highly resistant to knocks and scrapes, making it ideal for high-traffic areas in both domestic and commercial environments.
• Quick Drying: Formulated for faster drying times compared to some other undercoat plasters, allowing for quicker application of the finishing coat and accelerating project timelines.
• Suitable for Most Masonry Backgrounds: Highly versatile for use on a wide range of medium to high suction masonry surfaces, including:
  • Bricks (common, concrete)
  • Medium-density blocks
  • Aircrete blocks (e.g., thermalite)
  • Dense aggregate concrete blocks
  • Metal lath (e.g., expanded metal lath)
  • (Note: Not recommended for smooth, low suction blocks without prior treatment like Thistle Bond-it or Thistle GypPrime if required)
• Hand or Spray Application: Can be applied efficiently by hand with traditional plastering tools or by plaster projection machine for increased speed and convenience on larger jobs.
• Good Coverage: A 25kg bag typically covers approximately 3m² at the recommended 11mm thickness for walls (or 8mm for ceilings).
• Pre-Mixed Gypsum Plaster: A retarded hemihydrate, pre-mixed gypsum plaster that only requires the addition of clean water, ensuring consistency and ease of preparation on site.
• Excellent Base for Finish Plasters: Provides an ideal mechanical key and suction control for subsequent application of Thistle finishing plasters, ensuring a strong bond and a smooth final decorative surface.
• Resists Efflorescence: Helps to prevent the migration of salts to the surface (efflorescence), which can cause decorative issues on the finished wall.
• 25kg Bag Size: A standard and convenient size for handling and covering typical plastering areas.

Applications

Thistle HardWall is primarily used in the first coat of a two-coat plastering system for:

• New Build Construction: Applying directly to newly built brickwork, blockwork, or concrete walls.
• Renovation & Refurbishment: Re-plastering existing masonry walls after removal of old plaster or during structural alterations.
• Commercial & Residential Projects: Suitable for a wide range of internal wall applications where a durable and smooth plastered finish is required.
• Preparation for Tiling: While it's an undercoat, a finish coat of Thistle plaster is typically required before tiling, as tiles should not be applied directly to the undercoat (unless it's a specific exception like Thistle Dri-Coat).

Standards & Compliance

British Gypsum Thistle HardWall is manufactured to the highest standards, ensuring performance and safety:

• CE Marking: Conforms to the essential health, safety, and environmental protection requirements of all applicable European directives.
• BS EN 13279-1:2008, Type B4/20/2 and C3/20: Complies with the European standard for gypsum binders and gypsum plasters, indicating its strength and setting characteristics.
• Reaction to Fire Classification: Classified as A1 (non-combustible) in accordance with EN 13501-1.
• Responsible Sourcing: Certified to BES 6001 (Framework Standard for the Responsible Sourcing of Construction Products) achieving an 'Excellent' rating.