Cold Melt®

Building on its role as a seamless, cold-applied waterproofing solution, Cold Melt® integrates sustainable materials like recycled rubber crumb and castor oil for enhanced environmental credentials. This fully bonded system cures to form a monolithic membrane that's ideal for complex projects, with no fire risk during installation.

Core Components

• Cold Melt®: Applied via trowel or squeegee it offers elastomeric flexibility to accommodate movement without cracking
• Pro-Carrier SA: Allows instillation over a wide range of substrates including timber decks. Provides extra tensile strength to the system and crack capability.
• Pro-Primer SA: Self-adhesive primer for Pro-Carrier SA.
• DPM Primer: Speeds up workflows on damp / wet concrete substrates, (green concrete), allowing overlay once primer is cured, often just 3 days post-pour.
• Cold Melt® UV Top: Protects exposed Cold Melt® sections with pigmented protection, resisting UV degradation for long-term aesthetics in colours like Mid Grey, red blue, safety yellow.

Key Applications
From refurbishing failed single-ply, felt or asphalt layers in existing inverted setups (by stripping back finishes, and overlaying) to new builds, Cold Melt® excels in high-moisture environments. It's a core element of our Attenu8 system for stormwater management, seamlessly incorporating blue roof attenuation where needed.

Cold Melt offers versatile waterproofing for a range of protected roof and podium configurations, delivering reliable performance in both new builds and refurbishments. It's particularly effective in scenarios requiring minimal disruption and compatibility with existing structures.

Primary Applications

• Inverted Roofs and Podium Decks: Provides a seamless barrier in buried or protected setups, with insulation above the membrane for thermal efficiency
• Green Roofs and Roof Gardens: Supports vegetation layers, enhancing biodiversity while ensuring waterproof integrity—regular vegetation control per our Maintenance Guide is advised
• Balconies and Terraces: Ideal for pedestrian-access areas once covered / protected
• Blue Roofs as Part of Attenu8 System: Integrates with water attenuation designs for stormwater management; can include or exclude blue roof elements.  Recommended Blue Roof drainage inspection chambers inspected monthly for optimal function
• Refurbishment Over Existing Surfaces: Overlays single-ply, felt or asphalt membranes in inverted roofs—remove finishes and insulation, apply Cold Melt^®, then reinstate layers for cost-effective upgrades

Compatible with substrates such as concrete, timber, metal, and asphalt, ensuring broad project suitability.

Cold Melt^® delivers reliable performance across key metrics, backed by rigorous testing. Below is a summary of essential data for planning and installation—always refer to full datasheets for site-specific details.

Coverage and Application Rates

Drying and Curing Times (at 20°C)

Times vary with temperature, thickness, and porosity—protect from moisture during curing to avoid issues.

Packaging and Colours

Available in pre-proportioned units for accurate mixing.

UV Top offers colours including Black, Dark Grey, Mid Grey, Green, Light Blue, Red, Safety Yellow, and more.

Performance Standards

• Tested to BS EN 1504-2 as a protective waterproof coating
• Accommodates up to 98% RH substrates (BS 8203) with DPM Primer

For maintenance, our Proteus Maintenance Guide recommends bi-annual checks for inverted systems

Cold Melt^® is designed for straightforward, safe application by trained professionals, minimising downtime and risks. Follow these guidelines for optimal results in protected roof systems—always consult full datasheets and conduct adhesion tests where required.

Preparation Steps

• Substrate Readiness: Ensure surfaces are sound, clean, dry, and free from defects, oil, dust, or corrosion (per BS 8203). Repair cracks >0.5mm and achieve minimum 1:80 fall for drainage (BS 6229). Tested for zero fall for installation of Blue Roofs. 
• Concrete/screeds Prime wet/damp: Use DPM Primer to accommodate up to 98% RH in substrates prior to Cold Melt® overlay. Applied by roller/brush
• Priming:  All surfaces, apply Pro-Prime^® SA by roller/brush 
• Pro-Carrier SA: To all primed surfaces install Pro-Carrier SA

Application Process

COLD MELT®:

• Mixing: Stir resin, add hardener, and mix at 300-400 rpm for 2 minutes, avoid part-mixing
• Membrane Application: Spread Cold Melt^® using trowel or squeegee (2.5 kg/m² horizontal, 1.25 kg/m² vertical in two coats). Lightly roll surface with ribbed roller to eliminate roller marks and allow 6-36 hours curing dependant on air /substrate temperature
• Exposed detail Areas: Top with a coat of UV Top at 0.75 kg/m² via brush/roller for UV protection
• Details: Use pitch pockets for complex areas 
• Testing on Completions and Prior to covering : perform wet electronic leak tests on buried systems prior to being covered

Best Practices for Longevity

Adhere to our Proteus Maintenance Guide: Post-installation, schedule bi-annual inspections for debris, vegetation, and structural integrity in inverted or green setups to preserve performance.