Deck Waterproofing

Deck Waterproofing System

Our specialist deck waterproofing system provides a BBA approved, fully bonded, high-performance seamless waterproofing system for roofs (including blue/green roof structures), balconies, podium decks and structural slabs.

Built around the PolyMaxx HA liquid-applied membrane, these systems deliver durable, flexible, and rapid-curing waterproof protection suitable for both new and existing structures.

The PolyMaxx system is perfect for:

• New reinforced concrete deck waterproofing
• Existing reinforced concrete deck waterproofing
• Rib deck waterproofing
• Beam & block waterproofing
• Balcony waterproofing

When correctly specified, PolyMaxx HA prevents water tracking, accommodates movement, and integrates with drainage and protection layers to deliver long-term deck performance.

All PolyMaxx installations are completed by Newton certified installers to qualify for a 20 year comprehensive warranty.

What is Deck Waterproofing

Deck waterproofing systems form a continuous, reinforced membrane that protects exposed or buried deck structures from water ingress. PolyMaxx HA is a cold-applied, hybrid polyester resin that is reinforced with glass fibre matting to create a robust, joint-free barrier. The system also has strong adhesion to a wide range of substrates, including concrete, asphalt, timber, metal, EPDM, beam & block, and rib decks.

Key Characteristics of PolyMaxx HA:

• Seamless, fully bonded waterproofing layer
• High flexibility to accommodate structural movement
• Rapid curing for efficient sequencing on site
• Reinforced system for durability and wear resistance
• Compatibility with blue, green, warm, and zero-fall roof build-ups

Performance Benefits:

Depending on the installation and substrate type, the system will deliver:

• Seamless, crack bridging membrane reinforced with PolyMaxx Mat 225 for long-term reliability.
• Full substrate adhesion, reducing lateral water movement and improving durability.
• BROOF(t4) fire classification when installed as part of tested build-ups for balconies and roof decks.
• Rapid installation, with typical curing in 30–60 minutes, enabling early access for other trades.

These characteristics allow installers and architects to match the PolyMaxx HA system to different deck types, environmental conditions, and detailing complexity.

Typical Applications

PolyMaxx HA systems are suitable for:

• Podium deck, rib deck and buried deck waterproofing
• Balconies and walkways requiring anti-slip finishes
• Warm roofs incorporating insulation and vapour control layers
• Zero-fall roofs, blue roofs, and green roofs where integrated drainage/reservoir layers are required

Contact Newton Waterproofing

Newton’s technical team provides full design support, detailing guidance, and NBS specifications to help ensure system suitability across a range of deck constructions. Our Newton Specialist Contractors install all PolyMaxx HA systems to maintain warranty compliance and ensure long-term waterproofing performance.