Self-Adhesive Wet-Laid Waterproofing Membrane

Product Overview

The self-adhesive wet-laid waterproofing membrane is reinforced with a polyester fiber mat or high-performance polymer base material. Both sides are coated with advanced self-adhesive modified bitumen to ensure strong and durable bonding performance.

The lower surface is protected with a silicone-coated release film or release paper, while the upper surface is finished with a silicone release film or polyethylene film. This structure creates a stable separation layer designed specifically for wet-application installation.

Product Features

Cold & Wet Application Technology: No open flame or adhesive required. Safe, energy-saving, environmentally friendly, and low-carbon.
Moisture-Tolerant Installation: Can be installed on damp or slightly uneven substrates, making it highly effective during rainy seasons and reducing construction delays.
High Mechanical Strength: Excellent tensile strength, elongation capacity, puncture resistance, and durability.
Permanent Bonding System: Forms a strong and lasting bond with the structure, preventing water migration within the waterproofing layer.
Easy Leak Detection & Repair: Any localized damage can be quickly identified and repaired.
Composite Waterproofing Effect: When combined with cement-based materials, it forms a rigid waterproofing system that delivers dual protection.
Advanced Polymer Performance: Combines the convenience of wet-laid installation with the elasticity and durability of polymer-modified materials.

Product Structure & Classification

1. Wet-Laid Installation Principle

Wet-laid installation refers to applying the membrane directly onto a damp (not fully dry) substrate. No drying of the base layer is required. The membrane bonds firmly with the damp cementitious surface, forming a continuous waterproofing layer.

2. Reinforcement Types

Products are classified based on reinforcement materials:

Polymer-based waterproofing membranes
Polyester-reinforced waterproofing membranes (PY type)

Polymer-based membranes are further divided into:

High-strength (H) type
High-elongation (E) type

In these structures, the polymer layer may be positioned on the surface or embedded within the membrane for optimized performance.

3. Bonding Surface Types

Single-sided self-adhesive (S type)
Double-sided self-adhesive (D type)

4. Thickness Options

H / E types: 1.5 mm, 2.0 mm
PY type: 3.0 mm

Scope of Application

The wet-laid membrane is mainly used for non-exposed waterproofing systems, where it is bonded to cement mortar or similar substrates.

Typical applications include:

Underground waterproofing works
Basement and foundation systems
Tunnels and metro infrastructure
Moisture-prone construction environments
Projects requiring fast installation during rainy or humid conditions

For optimal performance, membrane overlaps should be sealed using self-adhesive joint technology.

Wet-Laid Waterproofing System – Construction Process

Standards & Compliance

Implementation Standard: GB/T 35467-2017

System Workflow

Substrate Cleaning → Surface Wetting (skip if already damp) → Positioning & Baseline Marking → Cement Slurry Mixing & Application → Membrane Installation → Air Removal (Slurry Rising & Venting) → Overlap Joint Sealing → Termination & Edge Sealing → Inspection & Acceptance

1. Preparation

Preparation includes all necessary materials, accessories, substrate evaluation, site readiness, and technical planning to ensure proper installation.

2. Substrate Requirements

The substrate must be:

Structurally sound and stable
Clean and free from dust, oil, and loose particles
Properly damp (saturated surface condition recommended)
Free of standing water

3. Surface Wetting

If the substrate is dry, lightly pre-wet the surface. If it is already damp, this step may be skipped.

4. Positioning & Layout

Carry out accurate baseline marking to ensure proper alignment of the membrane and consistent overlap during installation.

5. Cement Slurry Application

Apply a uniform layer of cement mortar (approximately 2–3 mm thick, adjusted according to substrate flatness) over the prepared surface.

6. Membrane Installation

Remove the lower release film from the membrane
Lay the membrane flat onto the fresh cement slurry
Ensure adjacent membranes are aligned in parallel and properly butted

7. Air Removal (Slurry Rising Process)

Use a wooden float or rubber roller to gently press the membrane surface, removing trapped air beneath it.
This ensures full contact and strong bonding between the membrane and cement slurry.

8. Curing

Allow the installed membrane system to cure for approximately 48 hours, depending on ambient temperature and site conditions. Avoid disturbance or load during curing.

9. Overlap Joint Treatment

Clean the overlap area thoroughly
Remove the upper release film in the overlap zone
Apply self-adhesive sealing strips over butt joints to ensure complete waterproof sealing

10. Termination & Edge Sealing

All membrane edges, terminations, and junctions must be sealed in accordance with design requirements and relevant waterproofing standards.

11. Inspection & Acceptance

Final inspection should confirm:

Full bonding with no hollow or air pockets
Properly sealed overlaps and joints
Continuous and uniform waterproof layer
Compliance with project specifications