1K Polyurethane Liquid Waterproofing Membrane | Manta PU-1K

Manta PU-1K is a single-component, moisture-curing polyurethane liquid waterproofing membrane applied at 1.3-1.5 kg/m² per 1.0 mm dry film for roofs, basements, wet areas and non-potable water tanks. It tolerates slightly damp substrates during application and resists permanent ponding water without re-emulsifying or blistering once cured.

Manta PU-1K is a ready-to-use, single-component (1K) polyurethane liquid waterproofing membrane. Engineered with advanced moisture-triggered curing technology, it reacts with ambient humidity to form a highly elastic, seamless, and incredibly tough rubber-like waterproof barrier.

Unlike conventional systems, Manta PU-1K is exceptionally damp-tolerant during application and exhibits outstanding resistance to continuous standing water (ponding water) once fully cured, making it the ultimate solution for demanding architectural waterproofing.

Features

• Ready-to-Use 1K System: No mixing errors, no pot-life anxiety. Open the pail and apply directly, significantly reducing labor costs.
• Damp-Tolerant Application: Can be applied on both dry and slightly damp substrates (without standing water), offering excellent schedule flexibility even in humid conditions.
• Ponding Water Resistance: Delivers exceptional hydrostatic resistance. Will not re-emulsify, blister, or degrade even under permanent standing water.
• Superior Elasticity & Adhesion: Bridges dynamic shrinkage cracks flawlessly and bonds tenaciously to concrete, masonry, and most construction substrates without the need for extensive priming.
• Seamless & Anti-Corrosive: Forms a continuous monolithic membrane free of vulnerable joints, providing excellent resistance against soil chemicals, decay, and corrosion.

Manta PU-1K is engineered for heavy-duty, long-term waterproofing, especially in areas with complex geometries and numerous pipe penetrations:

1. Roofs & Decks: Exposed and concealed flat roofs, green roofs, and balconies.
2. Underground Structures: Basements, retaining walls, foundation slabs, and trenches.
3. Wet Areas: Bathrooms, kitchens, and commercial washrooms.
4. Water Containment: Non-potable water tanks and reflection pools.

Application Guidelines (Standard Operating Procedure)

1. Substrate Preparation

The substrate must be structurally sound, flat, and free of laitance, dust, oil, and sharp protrusions.

Detailing: All internal corners (coves) should be chamfered to a radius of > 50mm, and external corners rounded to a radius of > 10mm.

2. Application Method

Apply Manta PU-1K evenly using a rubber/plastic squeegee, premium roller, or airless spray equipment.

Crucial Thickness Control: To prevent outgassing bubbles (CO2 release during curing), do not apply in one thick coat. The total required thickness (generally 1.5mm-2.0mm) must be built up in 3 to 4 successive thin coats.

Cross-Coating: Apply each subsequent coat in a perpendicular (cross) direction to the previous coat. Allow the previous coat to cure fully before applying the next.

3. System Thickness Requirements (Based on standard designs)

Underground Projects: 1.5mm (Range: 1.2mm – 2.0mm).

Bathrooms & Wet Rooms: Minimum 1.5mm.

Exposed Roofs: Multi-layer system: ≥ 1.2mm per functional layer.

Single-layer system: ≥ 2.0mm total thickness.

4. Reinforcement (For high-stress areas & Basements)

When incorporating a reinforcement fabric (matrix), apply a base coat of PU-1K (minimum 1.0mm thick), embed the fabric flat without wrinkles, and apply the top coat (minimum 0.5mm thick) ensuring full encapsulation.

5. Protection Layer

Upon complete curing and successful inspection, apply a suitable isolation/protection layer (e.g., screed or protective board) as per architectural design before backfilling or subsequent construction.