PU Koat

Key Benefits

Recommended Applications

• Flat and sloped roofs
• Terraces and balconies
• Exterior walls
• New construction waterproofing
• Roof refurbishment and repair
• Over bituminous surfaces
• Cementitious surfaces
• Concrete roofs
• Parapet walls
• Sunshades and chajjas
• Areas requiring crack-bridging waterproofing

Technical Specifications

Product Type	One-Component PU-Modified Liquid Waterproofing Membrane
Color	White (Heat Reflective)
Base	Water-Based, Solvent-Free, PU-Modified
Application	Roofs, Terraces, Exterior Walls
Application Method	Cold Applied – Brush or Roller
Elongation	Up to 350% (Superior Crack-Bridging)
Key Properties	Highly Elastic, UV Resistant, Seamless, Water Vapour Permeable, Non-Toxic
Performance Warranty	10 Years
Compliance	ASTM D 6083-97a
Cost Efficiency	Approximately ₹35 per sq. ft.
Environmental Certification	Green Pro Certified, VOC-Compliant
Available Pack Sizes	4 Ltr, 10 Ltr, 20 Ltr

Application Process

1. Surface Preparation

Cleaning: Ensure the substrate is clean, dry, and free from dust, dirt, loose particles, grease, oil, and other contaminants. Remove all loose material using wire brush or high-pressure water jet.

Repairs: Repair all major cracks, holes, and structural defects. Fill cracks wider than 2mm with suitable crack filler or mortar. Allow repairs to cure completely before proceeding.

Surface Condition: The substrate should be structurally sound, stable, and properly cured. New concrete should be at least 28 days old. Moisture content should be below acceptable levels.

2. Priming (If Required)

For highly porous or absorbent surfaces, apply a suitable primer (such as Berger HomeShield Epoxy Primer) to seal the surface and improve adhesion. Allow primer to dry completely before applying PU Koat.

3. Joint & Crack Treatment

Crack Filling: Fill all cracks and joints with Berger HomeShield Jointseal GG or suitable polyurethane sealant. This prevents crack propagation and provides additional waterproofing at vulnerable points.

Expansion Joints: Treat expansion joints with appropriate flexible sealant to accommodate structural movement while maintaining waterproof integrity.

4. PU Koat Application – First Coat

Mixing: Stir PU Koat thoroughly before use to ensure uniform consistency. The product is ready to use – no mixing with hardeners or catalysts required.

Application: Apply the first coat of PU Koat using high-quality brush or roller. Apply uniformly in one direction, ensuring complete coverage without missed spots.

Coverage: Maintain recommended wet film thickness for optimal waterproofing performance. Typical consumption is approximately 1.5-2 kg per square meter for complete waterproofing system.

Drying Time: Allow the first coat to dry completely (typically 6-8 hours under normal conditions) before applying subsequent coats.

5. Reinforcement (Optional but Recommended)

Mesh Reinforcement: For enhanced crack-bridging and strength, embed a polyester mesh or fiberglass fabric into the first coat while it is still wet. Ensure the mesh is fully embedded without air pockets.

Critical Areas: Pay special attention to corners, edges, joints, and areas around pipes, drains, and other penetrations. Apply additional reinforcement at these vulnerable points.

6. PU Koat Application – Second Coat

Apply the second coat perpendicular to the first coat direction for maximum coverage and seamless membrane formation. Ensure uniform thickness and complete coverage.

7. PCC Screed (Optional – For Heavy Traffic Areas)

For areas subject to foot traffic or mechanical stress, a thin PCC (Plain Cement Concrete) screed layer can be applied over the PU Koat to provide mechanical protection while maintaining the waterproofing membrane beneath.

8. Final Coat

After PCC screed (if applied) has cured and grid cutting is completed, apply a final coat of PU Koat to seal the entire surface, including any cuts or joints made during screed application.

9. Curing & Protection

Curing Time: Allow the final coat to cure completely (typically 24-48 hours) before exposure to water or foot traffic. Full cure may take 7 days.

Protection: Protect the applied coating from rain, water, and mechanical damage during the curing period. Avoid walking on the surface until fully cured.

10. Quality Check

Visual Inspection: Inspect the completed waterproofing membrane for uniform coverage, proper thickness, and absence of pinholes or defects.

Water Test: After complete curing, conduct a water ponding test by creating a water pool on the surface for 24-48 hours to verify waterproofing effectiveness.

11. Safety & Storage

Safety: PU Koat is water-based and non-toxic, making it safe for residential applications. Ensure adequate ventilation during application. Avoid contact with eyes and skin. If contact occurs, wash immediately with clean water. Keep out of reach of children.

Storage: Store in a cool, dry place away from direct sunlight and heat. Keep containers tightly closed when not in use. Protect from frost and freezing temperatures. Do not store near food items.

Comparison: PU Koat vs Conventional Methods

PU Koat vs Traditional Screed

Traditional Screed Disadvantages:

• Heavy layer creates significant load on roof structure
• Does not provide waterproofing – cracks develop allowing water penetration
• Costly at approximately ₹50 per sq. ft.
• No warranty provided
• Requires skilled masons who often lack proper waterproofing knowledge

PU Koat Advantages:

• No additional load on roof structure
• Superior waterproofing with crack-bridging up to 350% elongation
• Cost-effective at approximately ₹35 per sq. ft.
• 10-year performance warranty
• Easy application by any painter with brush

PU Koat vs APP Membrane

APP Membrane Disadvantages:

• Black bitumen-based – absorbs heat, increasing room temperature and electricity costs
• Requires heat for application, creating pollution and fire hazard
• Needs trained applicators – quality depends on applicator skill
• Creates load on roof structure
• If damaged, entire membrane must be redone (cannot repair sections)
• Not sustainable (produced from crude oil)

PU Koat Advantages:

• White color reflects heat, reducing surface temperature by up to 10°C
• Cold application – no heat, pollution, or fire risk
• Easy application by any painter without specialized training
• No additional load on roof
• Sectional repairs possible – damaged areas can be spot-repaired
• Eco-friendly, sustainable, Green Pro Certified

Why Choose Home Shield PU Koat?

Revolutionary Waterproofing Technology

PU Koat represents a paradigm shift in waterproofing technology, moving from outdated screed and bitumen methods to advanced polyurethane membrane systems. The one-component, cold-applied formula eliminates complexity while delivering superior performance.

Exceptional Elasticity & Crack Bridging

With up to 350% elongation capability, PU Koat bridges cracks and accommodates structural movements far better than conventional methods. This flexibility prevents waterproofing failure due to building settlement, thermal expansion, or minor structural shifts.

Long-Term Reliability

The 10-year performance warranty demonstrates Berger’s confidence in the product’s durability and effectiveness. This warranty provides homeowners with genuine peace of mind and protection for their investment.

Energy Efficiency & Cost Savings

The heat-reflective white finish reduces surface temperature and indoor heat gain, lowering air conditioning costs. This energy efficiency provides ongoing cost savings that compound over years, making PU Koat even more cost-effective long-term.

Comprehensive Protection

UV resistance, weather resistance, seamless membrane formation, and water vapour permeability combine to provide complete protection against all forms of water infiltration and environmental damage.

Application Convenience

The cold-applied, one-component system can be applied by any painter using simple brushes – no specialized equipment, no heat torches, no complex mixing. This simplifies application while ensuring consistent results.

Structural Preservation

Unlike heavy screed or APP membranes, PU Koat adds negligible weight to the roof structure. This preserves the building’s structural integrity and extends the roof’s lifespan.

Environmental Responsibility

Water-based, solvent-free, VOC-compliant, and Green Pro Certified – PU Koat demonstrates that superior performance and environmental sustainability are not mutually exclusive.

Superior Cost-Effectiveness

At approximately ₹35,000 for 1000 sq. ft. (vs ₹50,000 for screed or ₹50,000+ for APP membrane), PU Koat delivers superior performance at lower cost. Combined with the 10-year warranty and reduced energy costs, the long-term value is exceptional.

Proven Compliance & Standards

Compliance with ASTM D 6083-97a international standards ensures the product meets rigorous quality and performance requirements, providing additional assurance of reliability.

Why Choose Susmita Paints, Pokhara

• Authentic Berger Home Shield PU Koat with 10-year warranty
• Professional waterproofing consultation and system design
• Expert guidance on surface preparation and application techniques
• Complete Home Shield waterproofing product range for comprehensive solutions
• Access to certified waterproofing applicators for professional installation
• Reliable local service and technical support
• Competitive and transparent pricing
• Post-application support and maintenance guidance