Intelligent Membranes

Passivhaus Airtight Sealant - Box of 12 is specially formulated for creating reliable air barriers in Passivhaus and low-energy construction projects. This professional-grade sealant ensures airtightness, minimising heat loss and improving energy efficiency in new builds or retrofits. Supplied in a convenient box of 12, it is suitable for use on various surfaces, including masonry, wood, and metal. The Passivhaus Airtight Sealant offers excellent adhesion, flexibility, and durability, making it ideal for both internal and external applications where consistent performance is essential.

- Designed for Passivhaus airtightness standards and requirements
- Excellent adhesion to multiple building substrates and materials
- Flexible formulation accommodates structural movement over time
- Suitable for internal and external sealing applications
- Low VOC content supports healthy indoor environments
- Supplied in a cost-effective bulk box of 12 units

Shop Passivhaus Airtight Sealant on BuildBuddy. Reliable air barrier, strong adhesion, flexible use—ideal for energy-efficient builds.

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Passivhaus Airtight Sealent - Box of 12

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The GOAT Concrete and Masonry Waterproof Coating 7.5kg offers reliable protection for concrete and masonry surfaces, helping to prevent water ingress and structural damage. This high-performance waterproof coating is designed for both interior and exterior use, forming a durable, long-lasting barrier against moisture, mould, and mildew. Suitable for basements, walls, foundations, and other masonry areas, it ensures superior adhesion to various substrates. The easy-to-apply formula makes it ideal for professional contractors and DIY enthusiasts looking to preserve the integrity of their concrete or masonry structures.

- High-performance waterproof coating for concrete and masonry surfaces
- Suitable for interior and exterior applications on multiple substrates
- Prevents water ingress, mould growth, and structural deterioration
- Durable formulation delivers long-lasting moisture protection
- Easy application for both professionals and DIY users
- 7.5kg pack covers large areas efficiently

Protect surfaces with GOAT Concrete Waterproof Coating on BuildBuddy. Durable barrier against water; suitable for interior/exterior use; easy application.

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The GOAT Concrete and Masonry Waterproof Coating - 7.5kg

The GOAT Concrete and Masonry Waterproof Coating 18kg is a high-performance solution designed to protect concrete and masonry surfaces from water ingress and damp. Formulated for both residential and commercial applications, this waterproof coating delivers a durable, weather-resistant barrier suitable for exterior and interior use. Easy to apply with brush, roller, or spray, it adheres well to porous surfaces, preventing moisture damage while maintaining breathability. The GOAT Concrete and Masonry Waterproof Coating helps extend the lifespan of structures by reducing cracking, efflorescence, and mould growth on treated areas.

- Provides long-lasting waterproof protection for masonry surfaces
- Suitable for both interior and exterior concrete applications
- Resistant to weathering, efflorescence, mould, and mildew
- Easy application by brush, roller, or spray method
- Maintains breathability while blocking water penetration
- 18kg pack covers large surface areas efficiently

Shop the GOAT Concrete Waterproof Coating (18kg) at BuildBuddy. Durable, easy-to-apply protection for masonry. Weather-resistant and ideal for large projects.

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The GOAT Concrete and Masonry Waterproof Coating - 18kg

Poseidon Liquid Applied Waterproof Membrane - 7kg

Poseidon Liquid Applied Waterproof Membrane - 12kg

Passive Purple Airtight Liquid Vapour Control Membrane Brush - External 5kg

The 25m Airtight Tape 150mm is a high-performance sealing solution designed for construction and renovation projects requiring superior airtightness. This durable tape ensures long-lasting adhesion on a variety of surfaces, effectively minimising air leakage and enhancing energy efficiency. Its flexible, tear-resistant material makes it suitable for use around windows, doors, joints, and seams in both residential and commercial settings. The generous 25-metre length and 150mm width provide extended coverage for larger applications, ensuring reliable protection against draughts and moisture ingress. Ideal for builders, contractors, and DIY enthusiasts seeking to improve insulation performance with a professional-grade airtight tape.

Strong adhesive ensures secure bond on multiple building materials  
25 metre roll provides ample coverage for large-scale projects  
150mm width ideal for sealing wide joints or overlaps  
Highly flexible design adapts to irregular surfaces easily  
Prevents air leakage and improves overall energy efficiency  
Tear-resistant material withstands demanding installation conditions

Find the 25m Airtight Tape 150mm on BuildBuddy—flexible, strong adhesive tape perfect for sealing joints and improving insulation performance.

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25m Airtight Tape 150mm

25m Airtight Tape 150mm - Box of 2

Passive Purple Airtight Liquid Vapour Control Membrane Spray – External 10kg is a high-performance vapour control membrane designed for external application on building envelopes. This innovative spray-on solution creates an airtight and weather-resistant barrier, effectively reducing air leakage and improving energy efficiency in both residential and commercial projects. Suitable for use on a wide range of construction materials, Passive Purple ensures robust protection against moisture ingress while maintaining breathability. Its easy spray application saves time on site, making it ideal for new builds and renovations seeking enhanced airtightness and vapour control.

- Advanced airtight liquid vapour control membrane for external use
- Easy spray application enhances installation speed and uniformity
- Suitable for masonry, timber, concrete, and most substrates
- Creates a durable, weather-resistant and flexible protective barrier
- Improves building energy efficiency by reducing air leakage
- Vapour-permeable to prevent trapped moisture within structures

Shop Passive Purple Airtight Liquid Vapour Control Membrane Spray 10kg at BuildBuddy. Achieve superior airtightness, easy application, and weather resistance.

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Passive Purple Airtight Liquid Vapour Control Membrane Spray - External 10kg

Passive Purple Airtight Liquid Vapour Control Membrane Spray 6.9kg provides a high-performance air and vapour barrier for construction and renovation projects. This airtight membrane spray is easy to apply, quick-drying, and forms a seamless, flexible layer that effectively controls vapour movement. Suitable for use on a variety of substrates including concrete, masonry, plasterboard, and timber, Passive Purple ensures enhanced airtightness to improve energy efficiency and building comfort. Its low-VOC formula makes it safe for indoor applications while delivering long-lasting protection against moisture ingress.

- Provides superior air and vapour control for building envelopes
- Easy spray application on multiple surfaces for versatile use
- Quick-drying and forms a seamless, flexible membrane barrier
- Low-VOC formula suitable for indoor environments and renovations
- Enhances energy efficiency by improving overall airtightness
- Long-lasting protection against moisture ingress in buildings

Shop Passive Purple Airtight Liquid Vapour Control Membrane on BuildBuddy. Fast application, low VOCs, seamless barrier—ideal for improved building airtightness.

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Passive Purple Airtight Liquid Vapour Control Membrane Spray - 6.9kg

25m Airtight Tape - 100mm

25m Airtight Tape - 100mm - Box of 4

25m Airtight Tape 200mm

25m Airtight Tape 200mm - Box of 2

Passive Purple Airtight Liquid Vapour Control Membrane Brush - 3.7kg is a high-performance vapour control membrane designed to deliver superior airtightness and moisture management in construction projects. This liquid-applied membrane is easy to apply by brush, providing seamless coverage over a variety of surfaces including masonry, timber, and concrete. It creates an effective barrier against both air leakage and water vapour, significantly improving energy efficiency and building durability. The Passive Purple membrane is ideal for use in both new builds and refurbishments, supporting sustainable building standards while ensuring long-lasting protection.

- High-performance airtight liquid vapour control membrane
- Easy brush application for seamless surface coverage
- Suitable for masonry, timber, concrete and more
- Improves energy efficiency by reducing air leakage
- Enhances moisture management for building durability
- Ideal for new build and refurbishment projects

Shop Passive Purple Airtight Liquid Vapour Control Membrane on BuildBuddy. Brush application, airtight seal, moisture protection—ideal for all construction projects.

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Passive Purple Airtight Liquid Vapour Control Membrane Brush - 3.7kg

25m Airtight Tape 75mm

The 25m Airtight Tape 75mm - Box of 5 is designed for professional sealing applications, ensuring reliable airtight and vapour-proof joints. Suitable for use in construction projects and renovation works, this tape delivers strong adhesion to a variety of substrates including membranes, wood, and metal. Each roll measures 75mm in width and 25 metres in length, providing ample coverage for larger tasks. Manufactured to high standards, the tape is durable, flexible, and easy to apply by hand or with a dispenser. This box of five rolls is ideal for contractors seeking consistent quality and performance in airtightness solutions.

- Contains five rolls of 75mm x 25m airtight tape
- Ensures secure air and vapour barrier installations
- Strong adhesion to membranes, wood, metal and more
- Durable construction suitable for demanding environments
- Flexible material allows easy handling and application
- Ideal for construction or renovation airtight sealing projects

Shop the 25m Airtight Tape 75mm - Box of 5 on BuildBuddy. Reliable adhesion and durability for construction airtight sealing needs.