Merks M17: Cement-Based Waterproofing Solution for Positive and Negative Water Pressure
Merks M17 is a single-component, cement-based waterproofing material enhanced with special additives. It can be applied from both the positive and negative sides of concrete structures, providing effective waterproofing through its capillary-active nano-mineral technology. The product integrates with the concrete substrate, creating a durable and long-lasting waterproof barrier without forming a separate membrane layer.
Its advanced formulation makes it suitable for foundations, basements, water tanks, tunnels, and other structures exposed to continuous moisture and water pressure.
Key Features
- Single-component cement-based formulation
- Suitable for positive and negative side waterproofing
- Withstands water pressure up to 7 bar
- Resistant to sulfate attack
- Suitable for contact with potable water
- Penetrates and integrates with concrete
- Breathable structure: waterproof yet vapor permeable
- Resistant to freeze-thaw cycles
- Can be applied on fresh concrete surfaces
- Suitable for both horizontal and vertical applications
Applications
Merks M17 is designed for a wide range of waterproofing projects, including:
- Interior and exterior waterproofing of reinforced concrete walls
- Foundations, basements, and retaining walls
- Elevator pits and lift shafts
- Tunnels and underground galleries
- Water tanks and reservoirs
- Wastewater and drinking water treatment facilities
- Infrastructure projects exposed to groundwater pressure
Technical Properties
| Property | Value |
|---|
| Material Type | Cement, mineral fillers, polymer-modified additives |
| Appearance | Grey, red, or yellow powder |
| Mixing Ratio | 7–7.5 L water per 20 kg powder |
| Application Temperature | +5°C to +35°C |
| Dry Bulk Density | 1.20 kg/L |
| Wet Bulk Density | 1.75 kg/L |
| Maturation Time | 3–4 minutes |
| Pot Life | 25 minutes |
| Service Temperature | -20°C to +80°C |
| Time to Full Service | 5 days |
| Bond Strength to Concrete | ≥ 1.0 N/mm² |
| Capillary Water Absorption | ≤ 0.1 kg/m²h⁰·⁵ |
| Water Vapor Permeability | Class I (Sd) |
| Shelf Life | 12 months |
Surface Preparation
Proper surface preparation is essential for maximum waterproofing performance:
- Remove oil, grease, dust, rust, and loose particles.
- Clean the surface thoroughly, preferably using a water jet when necessary.
- Repair large cracks, tie-rod holes, and defects using Merks RP17.
- Lightly dampen absorbent surfaces before application.
- Avoid application under direct sunlight, strong wind, or frozen conditions.
Mixing Instructions
- Mix one 20 kg bag of Merks M17 with 7–7.5 liters of clean water.
- Use a low-speed mixer until a lump-free consistency is achieved.
- Allow the mixture to rest for 3–4 minutes.
- Remix briefly before use.
- Do not add extra water after mixing.
- The prepared mortar should be used within 25 minutes.
Application Method
Brush Application
- Apply the product in two coats using a brush or spray equipment.
- After spray application, smooth the surface using a brush.
- Ensure complete and uniform coverage.
Sprinkle Application
For foundation waterproofing beneath concrete slabs:
- Apply immediately before concrete placement.
- Divide the area into sections and distribute the material evenly.
- Follow project specifications for material consumption and coverage.
Curing
Proper curing is critical for achieving maximum waterproofing performance.
- Cure only with clean water.
- Do not use chemical curing compounds.
- Prevent rapid drying caused by sun or wind exposure.
- Cure the surface at least four times daily.
- Extend curing duration under hot weather conditions.
Consumption
- Brush application: Approximately 2 kg/m²
- Sprinkle application: Approximately 3 kg/m²
Packaging and Storage
- Supplied in 20 kg PE-reinforced kraft bags
- Store in unopened original packaging
- Keep in a dry, frost-free environment
- Shelf life: 12 months
Advantages of Merks M17
Merks M17 offers a reliable waterproofing solution that becomes part of the concrete structure itself. Unlike surface membranes that may peel or puncture, its active waterproofing technology penetrates the concrete matrix to provide long-term protection against moisture ingress.
Its ability to resist both positive and negative water pressure makes it especially suitable for below-grade structures, water tanks, and underground applications where conventional waterproofing systems may be difficult to install.
Frequently Asked Questions (FAQ)
1. Can Merks M17 be applied from both positive and negative sides?
Yes. It is specifically designed for waterproofing against both positive and negative water pressure.
2. Is it suitable for potable water applications?
Yes. Merks M17 is suitable for structures that come into contact with drinking water.
3. Can it be applied by both brush and sprinkle methods?
Yes. The product can be used as a brush-applied waterproofing coating or as a sprinkle-applied waterproofing system beneath foundations.
4. Why is curing important?
Proper water curing ensures crystal development, maximum waterproofing performance, and long-term durability.
5. Can it be used in tunnels and elevator pits?
Yes. It is widely used in tunnels, galleries, elevator shafts, basements, and other underground structures.
6. What is the water pressure resistance?
Merks M17 has been tested for resistance to water penetration under pressures up to 7 bar.
7. Does it require a protection board after application?
No. Since the material integrates with the concrete substrate, additional protection boards are generally not required.
8. What is the recommended application temperature?
Application should be carried out between +5°C and +35°C.
9. Can it be applied on fresh concrete?
Yes. Merks M17 is suitable for application on fresh concrete surfaces under appropriate site conditions.
10. Is the product vapor permeable?
Yes. It prevents water penetration while allowing water vapor to pass through, helping the structure breathe.