Sika Everbuild Aquaseal Liquid Roof - 7/21kg - Two-Coat Polyurethane-Based Waterproofing

Fast-Curing, Seamless Waterproofing Membrane for Flat & Pitched Roofs. Sika Everbuild Aquaseal Liquid Roof is a high-performance, moisture-triggered, polyurethane-based waterproofing membrane. Designed for both new roofs and refurbishment projects, it provides instant waterproofing even in damp conditions. Its fast-curing formulation allows application in changing weather, forming a seamless, elastic membrane that adheres to most common substrates. Ideal for long-lasting protection of flat and pitched roofs, balconies, and detailing work.. Key Features & Benefits. Rapid Curing: Rain-resistant in just 10 minutes after application.. Moisture Activated: Cures using atmospheric moisture without need for catalysts or accelerators.. Flexible & Seamless: Forms a fully bonded, joint-free membrane that accommodates structural movement.. Versatile Application: Suitable for use on concrete, bitumen, asphalt, felt, metal, tiles, timber, and more.. UV & Weather Resistant: Long-term protection against environmental exposure.. Reinforceable: Can be reinforced with fleece where additional strength is required.. Product Details. Form: Solvent-based, one-part liquid. Base: Polyurethane. Colour: Grey. Density: Approx. 1.42 kg/L. Solid Content: Approx. 80%. Sizes Available: 7kg and 21kg tins. Coverage: Approx. 0.7kg/m² per coat (2 coats recommended). Application Temperature: +5°C and rising. Drying Time: Rainproof in 10 minutes; fully cured in 24 hours (temperature dependent). Technical Performance. Tensile Strength: ~4.5 N/mm² (unreinforced). Elongation at Break: ~180% (unreinforced), ~50% (reinforced). Water Vapour Diffusion (Sd): 3.47m. External Fire Performance: BROOF(t1). Reaction to Fire: Euroclass E. Resistance to Wind Loads: >50 kPa. Application Instructions. Surface Prep: Ensure the substrate is clean, dry (or damp, but not wet), and free from contaminants.. Priming: May be required on porous or complex surfaces – refer to manufacturer guidance.. Apply First Coat: Use brush or roller to apply at approx. 1kg/m². Reinforce with fleece where necessary.. Second Coat: Once touch dry, apply second coat to achieve full waterproof protection.. Limitations. Not suitable for permanent water immersion.. Do not apply during rain or when rain is expected within curing time.. Use reinforcement fleece over bitumen, asphalt, and felt substrates.. Health & Safety. Contains isocyanates. Flammable liquid and vapour. May cause allergic skin reactions and respiratory irritation. Always use appropriate PPE, including gloves and eye protection. Refer to the product Safety Data Sheet (SDS) for detailed safety guidance.