Sikalastic-110 Polyurethane Bituminous Waterproofing Coating 20kg

Sikalastic-110 Polyurethane Bituminous Waterproofing Coating 20kg

A water-based, one-part modified polyurethane/bituminous coating that forms a highly elastic, seamless, crack-bridging waterproofing membrane. Suitable for concealed reinforced-concrete flat roofs, including structures subject to thermal movement and vibration, within the specified protected system.

Product Features

• High elasticity and crack-bridging capability.
• Good adhesion to prepared concrete.
• Application by brush, roller or airless spray, including vertical walls and ceilings.
• One-part formulation; stir until homogeneous before use.
• Water-based, low-VOC formulation.
• Standard or reinforced coating-system options.

Specifications

• Brand: Sika
• Model: Sikalastic-110
• Composition: Polyurethane bituminous hybrid
• Packaging: 20kg pail
• Colour: Black
• Density: 1.08 kg/L
• Shelf life: 12 months from production
• Storage: Original unopened, undamaged sealed packaging in dry conditions at +5°C to +30°C, protected from direct sunlight

Application

For waterproofing concealed reinforced-concrete flat roofs and suitable structures subject to thermal movement or vibration. The referenced system is cured before being overlaid with cementitious screed; do not assume suitability as an exposed roof finish.

Although the reference's overview mentions damp-surface application, its detailed preparation requirements specify substrate moisture below 6% by weight, no rising moisture and no standing water. Follow these measured limits rather than applying onto visibly wet or saturated concrete.

How to Use

1. Allow new concrete to cure for at least 28 days. The substrate must be sound and have pull-off strength of at least 1.5 N/mm².
2. Mechanically prepare an open-textured surface. Remove weak concrete, existing coatings or membranes, laitance, dirt, grease, oil, surface treatments and loose material. Expose defects and remove dust using industrial vacuum equipment. Carry out an application trial and adhesion tests before full application.
3. Confirm substrate moisture below 6% by weight and no rising moisture according to ASTM D4263. Remove all puddles and standing water.
4. Apply at air and substrate temperatures of +5°C to +40°C with relative humidity no higher than 80%. Keep the substrate and uncured membrane at least 3°C above the dew point.
5. Stir manually or with a low-speed mixer until homogeneous. For the primer only, dilute Sikalastic-110 with 1 part clean water as directed by Sika and stir gently until uniform. Apply approximately 0.2 kg/m² and allow it to dry.
6. For the standard system, apply two coats of undiluted Sikalastic-110 at approximately 0.65 kg/m² each. Ensure each preceding layer is completely dry before recoating.
7. For the reinforced system, apply the first coat at approximately 0.8 kg/m² and embed one layer of Sika Reemat Premium-120 while wet. Roll out bubbles and creases. Provide at least 50mm edge overlaps and 100mm border overlaps, as specified in the reference. Follow with two further coats at approximately 0.5 kg/m² each, allowing each preceding coat to dry completely.
8. Allow at least 48 hours of curing before overlaying with cementitious screed, subject to actual conditions and the current Product Data Sheet.
9. Clean tools and application equipment with water immediately after use. Cured material requires mechanical removal.

What's in the Box

One 20kg pail of black Sikalastic-110. Sika Reemat Premium-120 reinforcement, screed, application tools and other system materials are not listed as included.

Technical Information

• Tensile strength without reinforcement: Approximately 1.5 N/mm², ASTM D412.
• Elongation at break without reinforcement: Approximately 1000%, ASTM D412. This is a material test value, not an allowable structural-joint movement rating.
• Standard system: Diluted primer approximately 0.2 kg/m², followed by two coats at approximately 0.65 kg/m² each.
• Reinforced system: Diluted primer approximately 0.2 kg/m², first coat approximately 0.8 kg/m² with one layer of Sika Reemat Premium-120, then two coats at approximately 0.5 kg/m² each.
• Consumption figures are theoretical and exclude additional material due to porosity, surface profile, level variations and wastage.
• Primer waiting time at +30°C: Approximately 30–60 minutes minimum; 2 days maximum.
• Standard-system intercoat waiting time at +30°C: Approximately 4–5 hours minimum; 2 days maximum.
• The reference also lists a 5–8-hour minimum intercoat window at +30°C with the same duplicated standard-system label. Confirm the applicable window for the selected system with Sika; do not assume the ambiguous entry applies to the reinforced system.
• Full cure: At least 48 hours at +25°C. Allow at least 48 hours before screed overlay and adjust for site conditions.