KingProof HDPE®
Pre-applied, fully bonded HDPE waterproofing membrane with sand finish for below-grade waterproofing.
Overview
KingProof HDPE is a high-performance, pre-applied, fully bonded HDPE waterproofing membrane engineered with a multi-layer composite structure. It comprises a durable HDPE sheet, a pressure-sensitive adhesive layer and a unique particulate sand-finish surface, and is supplied with an integrated selvedge along one edge to facilitate self-adhered overlaps. KingProof HDPE is designed for installation on uniform concrete blinding or compacted sand-stone cushion bases, making it ideal for below-ground and blind-side waterproofing where direct access is limited. On concrete placement, the membrane forms a continuous and permanent bond with the poured concrete, ensuring long-lasting watertight integrity.
Applications
- Below-grade waterproofing
- Foundations and basements
- Protection against underground gas leakage (coal gas, methane, etc.)
- Tunnelling (MRT, subways, metro)
Advantages
- Fully bonded system with mechanical adhesion through the granular sand finish
- Provides a water and moisture barrier
- Excellent mechanical properties
- Easy and quick application – no priming or fillets required
- Temporarily UV resistant during application and steel-fixing works
- Trafficable immediately after installation and ready for immediate steel placement
- Displacement-resistant – maintains integrity and adhesion in ground-settlement conditions
- Watertight laps and detailing
Technical Properties
| Property | Value | Standard |
|---|---|---|
| Material | HDPE + pressure-sensitive adhesive + sand layer | — |
| Thickness | 1.2 or 1.5 mm | — |
| Tensile strength (ASTM D 412, modified) | ≥ 25 MPa | — |
| Elongation (ASTM D 412, modified) | ≥ 500% | — |
| Puncture resistance (ASTM E 154) | 1000 N | — |
| Peel adhesion to concrete (ASTM D 903, modified) | 1.0 N/mm | — |
| Hydrostatic pressure resistance (ASTM D 5385, modified) | ≥ 0.7 MPa (~7 bar); 1 hr no leakage | — |
| Water-vapour transmission (ASTM E 96) | 0.4 ng/(m².s.Pa) | — |
| Static load resistance (EN 12730 B) | No leak at 20 kg (Pass) | — |
| Tensile strength MD/CMD (EN ISO 12311-2 B) | ≥ 15 MPa | — |
| Elongation MD/CMD (EN 12311-2 B) | ≥ 400% | — |
| Tear resistance MD (EN 12310-1) | ≥ 200 N (nail shank) | — |
| Tear resistance CMD (EN 12310-1) | ≥ 500 N (nail shank) | — |
| Water tightness (EN 1928 A) | No penetration to upper filter paper (Pass) | — |
| Impact resistance (EN 12691) | ≥ 1500 mm | — |
| Lap peel adhesion (ASTM D 1876) | 1.5 N/mm | — |
| Low-temperature flexibility (ASTM D 1970) | -25°C (Pass) | — |
| Joint shear resistance (EN 12317-2) | ≥ 600 N/50 mm | — |
Standards & Approvals
Usage & Packaging
Thickness 1.2 or 1.5 mm. Width 1 m (+1%). Length 20 m.
Roll area approx. 20 m² (1 m width); overlap along the self-adhered selvedge per the installation method, so allow extra for overlaps.
KingProof HDPE rolls must be stored at temperatures between 5°C and 45°C, away from direct sunlight in cool, dry conditions. Store vertically as a single layer and avoid contact with acids, alkalis, oils and organic solvents.
Roll
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