Concealed Elastomeric PU Coating
(Sub-Grade & Under-Screed Specification)
Product Overview
The definitive foundation-grade waterproofing membrane for concealed horizontal structural assemblies. Formulated from a robust aromatic polyurethane matrix, this single-component, moisture-curing system is engineered exclusively for non-exposed environments. It creates a seamless, monolithic elastomeric barrier directly beneath rigid wearing courses—such as cementitious screeds, mortar beds, and tile installations—providing absolute watertightness while neutralizing dynamic structural stress.
Core Advantages
▪ Dynamic Crack Isolation (Uncoupling Effect): Creates a highly flexible, rubberized membrane between
the structural concrete and the rigid finishing layers (mortar/tiles). This critical elastomeric buffer absorbs thermal cycling and substrate settlement, preventing the transfer of micro-cracks to the expensive decorative surfaces above.
▪ Monolithic Sub-Screed Armor: Unlike sheet membranes that present vulnerable seams, this liquid-applied system cures into a 100% joint-free, continuous barrier. It perfectly conforms to complex deck geometries, providing an impenetrable defense against moisture ingress in balconies, terraces, and wet-room sub-floors.
▪ Superior Inter-Coat Integration: Engineered for high-efficiency, multi-pass installation. The advanced chemical matrix ensures flawless cohesive bonding between consecutive coats without the need for aggressive inter-coat surface preparation, guaranteeing a homogeneous, high-build membrane.
▪ Zero-Flame Hazard-Free Deployment: The cold-applied, 1K chemistry eliminates the severe fire risks associated with torch-applied bitumens, making it the mandated safety choice for confined residential balconies and high-density urban construction zones.
Engineered Applications
▪ Concealed waterproofing beneath tile, stone, and rigid screeds.
▪ Structural sub-layers for residential balconies, terraces, and patio decks.
▪ General non-exposed horizontal waterproofing in wet rooms and utility spaces.
▪ Moisture barriers under green-roof drainage composites and planter boxes.
System Integration: The Concealed Sub-Screed Defense Matrix
To guarantee absolute watertightness beneath heavy cementitious screeds or expensive tile finishes, relying on a liquid membrane in isolation is a structural gamble. In concealed applications, a single membrane failure requires the catastrophic and expensive demolition of the entire finished surface to repair. Eliminate hidden micro-blisters, reinforce critical transitions, and secure monolithic tile adhesion by integrating these mandatory concealed components:
Concrete Out-Gassing & Substrate Consolidation:
Must pair with: Elite Vapor-Lock & Pore-Sealing Epoxy Matrix
Why it’s critical: Polyurethane is highly reactive to residual moisture and trapped air in the concrete deck. If applied directly to porous balcony slabs, the curing process draws air out, creating hundreds of hidden pinholes and blisters that compromise the entire waterproof barrier. This deep-penetrating epoxy primer permanently seals the capillary network, providing a flawless, out-gas-free foundation that ensures the PU layer cures into an impenetrable, solid rubber shield.
Dynamic Perimeter & Balcony Edge Reinforcement:
Must pair with: High-Tenacity Elastomeric Flash-Bond Matrix
Why it’s critical: Balconies and terraces experience significant thermal expansion and structural deflection. Liquid membranes naturally thin out over the 90-degree wall-to-floor joints and parapet edges. This cold-applied, non-woven butyl tape must be centered over all angular transitions to act as a high-tensile structural “skeleton,” absorbing kinetic energy and preventing the aromatic PU from tearing at the building’s highest-stress points.
Zero-Slip Direct-to-Tile Grip & Delamination Defense:
Must pair with: Industrial Grip-Engineering Matrix
Why it’s critical: A cured aromatic polyurethane membrane creates a smooth, water-repellent rubber surface. Applying rigid cementitious screeds or tile thin-set directly to this smooth finish guarantees severe slippage, hollow-sounding tiles, and eventual catastrophic delamination. Applying this suspension-quartz grip primer over the cured PU membrane creates an aggressive, high-friction mechanical key, permanently fusing the rigid wearing course to the flexible waterproofing layer below.