Sand Surfaced Backed HDPE Waterproofing Membrane Pre Laid Waterproof Membrane Roll
Price:
USD 2.2‑3.8 /㎡
MOQ:
3000㎡
Delivery Time:
Negotiable
Brand:
shhous
Product Description
Sand-surfaced Backed Hdpe Pre-laid Waterproof Membrane
Product Advantages
1. Dual-sided structure: The backing layer strengthens tensile and tear resistance; the sand-coated layer provides strong concrete interlock, stable dimension and less construction damage.
2. Pre-laid reverse bonding & anti-water channeling: The sand surface interlocks firmly with post-poured concrete, integrating waterproof layer with structure to eliminate hidden leakage and water channeling.
3. High puncture and tear resistance: HDPE base material effectively resists piercing and extrusion from steel bars and gravel.
4. Cold application & safe construction: No open flame, no hot melt. Construction available on damp substrates, safe for underground confined spaces.
5. Non-asphalt & high durability: Excellent acid, alkali and groundwater corrosion resistance, no aging or migration for long-term underground waterproofing.
6. Cost and time saving: No additional cement protective layer required, simplifying procedures and reducing project cost.
| No. | Item | Index‑P | |
| 1 | Tensile property | Tensile force/(N/50 mm) ≥ | 600 |
| Tensile strength/MPa ≥ | 16 | ||
| Membrane breaking elongation/% ≥ | 400 | ||
| Phenomenon during stretching | Adhesive layer shall not separate from main material or substrate | ||
| 2 | Nail‑rod tear resistance/N | ≥ | 400 |
| 3 | Puncture‑resistance strength/N | ≥ | 350 |
| 4 | Impact resistance (0.5 kg·m) | No leakage | |
| 5 | Static load resistance | 20 kg, no leakage | |
| 6 | Heat resistance | 80 ℃, 2 h: no slipping, flowing or dripping | |
| 7 | Low‑temperature bending property | Main material:‑35 ℃, no crack | |
| 8 | Low‑temperature flexibility | Adhesive layer:‑25 ℃, no crack | |
| 9 | Oil‑penetration resistance /number of sheets | ≤ | 1 |
| 10 | Water‑channeling resistance (hydraulic gradient) | 0.8 MPa/35 mm, 4 h no water channeling | |
| 11 | Water impermeability (0.3 MPa,120 min) | Water‑impermeable | |
Construction Process
1. Substrate treatment: Remove sharp debris and bumps. Flat and damp surface is acceptable, no standing water.
2. Directional laying: Lay the membrane with backing side down and sand surface upward toward concrete structure.
3. Lap sealing: Remove release film, press laps tightly. Apply reinforcement at corners and details.
4. Edge fixing: Fix and seal membrane ends and laps with pressure strips to avoid displacement and blistering.
5. Finished product protection: Avoid sharp impact and puncture. Complete steel bar binding timely.
6. Concrete pouring: Pour concrete directly on the sand surface to achieve integral reverse bonding waterproof structure.
Application Scenarios
Suitable for all underground pre-laid reverse bonding waterproof projects: Basement slabs, underground garages,
underground side walls, subways, tunnels, utility tunnels, civil air defense projects and other underground structures.
Not applicable: Exposed roof and long-term outdoor sunlight environment.
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Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
Weifang Shihua Chemical Building Material Co., Ltd.
Location
Shouguang City, Shandong Province, China
Contact Person
Faye Wang